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Dugic, I. (2019). Effect of Casting Temperature on the Surface Finish of Grey Iron Castings. In: Lambotte G., Lee J., Allanore A., Wagstaff S. (Ed.), Materials Processing Fundamentals 2019: . Paper presented at Materials Processing Fundamentals, 10-14 March 2019 (pp. 87-95). Springer
Open this publication in new window or tab >>Effect of Casting Temperature on the Surface Finish of Grey Iron Castings
2019 (English)In: Materials Processing Fundamentals 2019 / [ed] Lambotte G., Lee J., Allanore A., Wagstaff S., Springer, 2019, p. 87-95Conference paper, Published paper (Refereed)
Abstract [en]

One of the most common surface defects in sand casting of grey cast iron is caused by metal penetration into the sand mould. Metal penetration is a surface condition in which metal or metal oxides have filled the voids between sand grains to various depth without displacing them, thus yielding a phase of sand grains surrounded by metal and frequently by mould–metal reaction products. The penetration is often so severe that casting components are beyond the point of economical rework and must be scrapped. This experimental work has focused on reducing metal penetration on casting component on a production scale. The casting component produced has strongly affected by sand sintering metal penetration. A series of simulations were performed with the casting simulation program MagmaSoft® in order to investigate the solidification characteristics as well as the porosity formation in the casting component. 

Place, publisher, year, edition, pages
Springer, 2019
Series
The Minerals, Metals & Materials Series, ISSN 2367-1181, E-ISSN 2367-1696
Keywords
Casting simulation, Grey cast iron, Metal penetration, Solidification, Surface finish
National Category
Metallurgy and Metallic Materials
Research subject
Technology (byts ev till Engineering), Mechanical Engineering
Identifiers
urn:nbn:se:lnu:diva-82767 (URN)10.1007/978-3-030-05728-2_8 (DOI)2-s2.0-85064768814 (Scopus ID)9783030057275 (ISBN)978-3-030-05728-2 (ISBN)
Conference
Materials Processing Fundamentals, 10-14 March 2019
Note

Conference code: 224799; Export Date: 22 May 2019; Conference Paper

Available from: 2019-05-27 Created: 2019-05-27 Last updated: 2019-08-29Bibliographically approved
Dugic, I., Berndt, R., Josefsson, S. & Hedström, M. (2018). Non-metallic inclusion and their effect on fatigue strength for case-hardened carbon steel in gears. In: TMS 2018 147th Annual Meeting & Exhibition Supplemental Proceedings. TMS 2018: . Paper presented at TMS 2018147th Annual Meeting & Exhibition, March 11-15 2018, Phoenix, Arizona (pp. 123-133). Springer
Open this publication in new window or tab >>Non-metallic inclusion and their effect on fatigue strength for case-hardened carbon steel in gears
2018 (English)In: TMS 2018 147th Annual Meeting & Exhibition Supplemental Proceedings. TMS 2018, Springer, 2018, p. 123-133Conference paper, Published paper (Refereed)
Abstract [en]

Steel is a very essential structural material and its production worldwide has shown significant increase over the last years. In steels there always exist a large number of inclusions which can have a degrading effect on the fatigue properties. This study is focused on the link between the characteristics of non-metallic inclusions and how they affect fatigue strength of the standardized case-hardened carbon steel 20MnCr5 and a version of this steel with a more favorable inclusion distribution, a so-called Clean steel. For the evaluation of the mechanical properties the test result from rotary bending tests are compared and an improvement by 37.5% in fatigue strength can be noted between the different steels. The new performed ultrasonic tests illustrate the difference in the size of defects in materials with different manufacturing processes and degree of reduction. By studying international and European standards for non-destructive testing and investigation of alloy compounds, the current material specification can be adjusted. © The Minerals, Metals & Materials Society 2018.

Place, publisher, year, edition, pages
Springer, 2018
Series
The Minerals, Metals & Materials Series, ISSN 2367-1181, E-ISSN 2367-1696
Keywords
Clean-steel, Inclusions, Mechanical properties, Standard, Steel, Ultrasonic test, Bending tests, Binary alloys, Carbon steel, Chromium alloys, Fatigue of materials, Fatigue testing, Hardening, Manganese alloys, Nondestructive examination, Standards, Clean steel, Degree of reduction, European Standards, Inclusion distribution, Manufacturing process, Material specification, Non destructive testing, Non-metallic inclusions, Ultrasonic testing
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Technology (byts ev till Engineering), Mechanical Engineering
Identifiers
urn:nbn:se:lnu:diva-83521 (URN)10.1007/978-3-319-72526-0_12 (DOI)2-s2.0-85044442225 (Scopus ID)9783319725253 (ISBN)
Conference
TMS 2018147th Annual Meeting & Exhibition, March 11-15 2018, Phoenix, Arizona
Available from: 2019-05-27 Created: 2019-05-27 Last updated: 2019-05-28Bibliographically approved
Dugic, I. (2017). Effect of Molybdenum Content, Pouring Temperature and Cooling Rate on the Casting Defects of High Chromium White Cast Iron. In: TMS 2017 146TH ANNUAL MEETING & EXHIBITION SUPPLEMENTAL PROCEEDINGS: . Paper presented at 146th TMS Annual Meeting and Exhibition, FEB 26-MAR 02, 2017, San Diego, CA (pp. 475-482). Springer
Open this publication in new window or tab >>Effect of Molybdenum Content, Pouring Temperature and Cooling Rate on the Casting Defects of High Chromium White Cast Iron
2017 (English)In: TMS 2017 146TH ANNUAL MEETING & EXHIBITION SUPPLEMENTAL PROCEEDINGS, Springer, 2017, p. 475-482Conference paper, Published paper (Refereed)
Abstract [en]

High chromium white cast are commonly used in application requiring excellent abrasion resistance, as central parts for pumps. The specifications and requirements applied for the white cast iron components are among the most stringent used within the iron foundry branch. One of the biggest problems for the production of these components is hot tearing. Irrespective of the name, this phenomenon represents the formation of an irreversible failure (crack) in the still semisolid casting. This paper aims to investigate the effect of molybdenum content, pouring temperature and cooling rate on the casting defect hot tearing. The procedure to achieve this was to study one casting component, impeller, in a production scale. The experiments showed that molybdenum content and pouring temperature had an important influence on casting defects. It was also observed that the solidification rate has a strong effect on the hot cracking.

Place, publisher, year, edition, pages
Springer, 2017
Series
Minerals Metals & Materials Series, ISSN 2367-1181
Keywords
White cast iron, Molybdenum, Pouring temperature, Cooling rate, Hot tearing and casting
National Category
Metallurgy and Metallic Materials
Research subject
Technology (byts ev till Engineering), Mechanical Engineering
Identifiers
urn:nbn:se:lnu:diva-67009 (URN)10.1007/978-3-319-51493-2_45 (DOI)000401654100045 ()2-s2.0-85042355043 (Scopus ID)978-3-319-51493-2 (ISBN)978-3-319-51492-5 (ISBN)
Conference
146th TMS Annual Meeting and Exhibition, FEB 26-MAR 02, 2017, San Diego, CA
Available from: 2017-07-19 Created: 2017-07-19 Last updated: 2019-08-29Bibliographically approved
Dioszegi, A., Svidro, P., Elmquist, L. & Dugic, I. (2016). Defect formation mechanisms in lamellar graphite iron related to the casting geometry. International Journal of Cast Metals Research, 29(5), 279-285
Open this publication in new window or tab >>Defect formation mechanisms in lamellar graphite iron related to the casting geometry
2016 (English)In: International Journal of Cast Metals Research, ISSN 1364-0461, E-ISSN 1743-1336, Vol. 29, no 5, p. 279-285Article in journal (Refereed) Published
Abstract [en]

Although lamellar cast iron has been used in advanced applications for about 20 years, our knowledge about the mechanisms affecting microstructure and defect formation is relatively limited. The present paper summarises some solidification-related phenomena from a series of recently published peer-reviewed papers and scientific theses and suggests a mechanism of defect formation which is dependent on the shape of the solidifying casting geometry. When shrinkage porosity or metal expansion penetration occurs, evidence of material transport in the intergranular zone of primary equiaxed austenite grains in the casting and in the intergranular regions between the sand grains in the mould material is seen. Material transport occurs across the casting-mould interface, where the existence of or the permeability of the primary columnar zone determines if material transport can take place.

Keywords
Lamellar graphite iron, Shrinkage porosity, Metal expantion penetrayion, Defect formation mechanisms, Primary austenite grains, Equiaxed zone, Columnar zone, Columnar to equiaxed transition
National Category
Metallurgy and Metallic Materials
Research subject
Technology (byts ev till Engineering), Mechanical Engineering
Identifiers
urn:nbn:se:lnu:diva-58208 (URN)10.1080/13640461.2016.1211579 (DOI)000386206200006 ()2-s2.0-84980349450 (Scopus ID)
Available from: 2016-11-18 Created: 2016-11-18 Last updated: 2017-11-29Bibliographically approved
Dugic, I., Henriksson, F., Strebel, C., Kosmaz, O. & Seifeddine, S. (2016). On the Effects of Alloying Element Range on the Mechanical Properties of Recycled Aluminium Alloy EN AB-46000. In: Edward Williams (Ed.), Light Metals 2016: . Paper presented at 145th TMS - Annual Meeting & Exhibition, Nashville, Tennessee, USA, February 14–18, 2016. John Wiley & Sons
Open this publication in new window or tab >>On the Effects of Alloying Element Range on the Mechanical Properties of Recycled Aluminium Alloy EN AB-46000
Show others...
2016 (English)In: Light Metals 2016 / [ed] Edward Williams, John Wiley & Sons, 2016Conference paper, Published paper (Refereed)
Abstract [en]

Aluminium can be produced from the raw material bauxite or by recycling aluminium scrap. When aluminium is being recycled, the material strength is then depending on the alloying and trace elements in the aluminium scrap. This paper aims to investigate the sole effect of the alloying element range of Si, Cu, Mg, Mn and Fe on the mechanical properties of the recycled aluminium alloy EN AB-46000 by producing directional solidified samples with low defect levels.

Place, publisher, year, edition, pages
John Wiley & Sons, 2016
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:lnu:diva-51044 (URN)10.1002/9781119274780.ch20 (DOI)2-s2.0-84974577121 (Scopus ID)978-1-119-22579-9 (ISBN)978-1-119-27478-0 (ISBN)
External cooperation:
Conference
145th TMS - Annual Meeting & Exhibition, Nashville, Tennessee, USA, February 14–18, 2016
Available from: 2016-02-03 Created: 2016-03-18 Last updated: 2016-08-31Bibliographically approved
Diószegi, A., Svidró, P., Elmquist, L. & Dugic, I. (2015). Defect formation mechanisms in lamellar cast iron related to the casting geometry. In: Laurentiu Nastac, Baicheng Liu, Hasse Fredriksson, Jacques Lacaze, Chun-Pyo Hong, Adrian Catalina, Andreas Buhrig-Polaczek, Daan M. Maijer, Charles Andrew Monroe, Adrian Sabau, Roxana Ruxanda, Alan A. Luo, Subhayu Sen, Attila Diószegi (Ed.), Advances in the science and engineering of casting solidification: An MPMD symposium honoring Doru Michael Stefanescu. Paper presented at The honorary symposium "Advances in the Science and Engineering of Casting Solidification" (TMS2015, Orlando, Florida, March 15-19, 2015) held in honor of Professor Doru Michael Stefanescu, Emeritus Professor, Ohio State University and the University of Alabama, USA (pp. 251-259). Hoboken, NJ: John Wiley & Sons
Open this publication in new window or tab >>Defect formation mechanisms in lamellar cast iron related to the casting geometry
2015 (English)In: Advances in the science and engineering of casting solidification: An MPMD symposium honoring Doru Michael Stefanescu / [ed] Laurentiu Nastac, Baicheng Liu, Hasse Fredriksson, Jacques Lacaze, Chun-Pyo Hong, Adrian Catalina, Andreas Buhrig-Polaczek, Daan M. Maijer, Charles Andrew Monroe, Adrian Sabau, Roxana Ruxanda, Alan A. Luo, Subhayu Sen, Attila Diószegi, Hoboken, NJ: John Wiley & Sons, 2015, p. 251-259Conference paper, Published paper (Refereed)
Abstract [en]

Although lamellar cast iron has been used in advanced applications for about twenty years, our knowledge about the mechanisms affecting microstructure and defect formation is relatively limited. The present paper summarizes some solidification related phenomena from a series of recently published peer reviewed papers and scientific theses and suggests a mechanism of defect formation which is dependent on the shape of the solidifying casting geometry. When shrinkage porosity or metal expansion penetration occurs evidence of material transport in the intergranular zone of primary equiaxed austenite grains in the casting and in the intergranular regions between the sand grains in the mold material is seen. Material transport occurs across the casting-mold interface where the existence of or the permeability of the primary columnar zone determines if material transport can take place.

Place, publisher, year, edition, pages
Hoboken, NJ: John Wiley & Sons, 2015
Keywords
Lamellar Cast Iron, Columnar Zone, Equiaxed Zone, Permeability, Material Transport
National Category
Metallurgy and Metallic Materials Mechanical Engineering
Identifiers
urn:nbn:se:lnu:diva-51029 (URN)10.1002/9781119093367.ch30 (DOI)2-s2.0-84931471962 (Scopus ID)9781119082385 (ISBN)9781119093367 (ISBN)
Conference
The honorary symposium "Advances in the Science and Engineering of Casting Solidification" (TMS2015, Orlando, Florida, March 15-19, 2015) held in honor of Professor Doru Michael Stefanescu, Emeritus Professor, Ohio State University and the University of Alabama, USA
Available from: 2015-07-28 Created: 2016-03-18 Last updated: 2019-08-15Bibliographically approved
Dugic, I. (2015). Effect of cooling rate on the casting defects of high chromium white cast iron for the impellers. In: Alojz Križman; Mirjam Jan-Blažič; Martin Debelak; Peter Schumacher; Rüdiger Deike (Ed.), Zbornik povzetkov referatov 55. mednarodnega livarskega posvetovanja, Portorož 2015: . Paper presented at 55th International Foundry Conference Portorož 2015, 16th to 18th September 2015 (pp. 35). Ljubljana: Društvo livarjev Slovenije
Open this publication in new window or tab >>Effect of cooling rate on the casting defects of high chromium white cast iron for the impellers
2015 (English)In: Zbornik povzetkov referatov 55. mednarodnega livarskega posvetovanja, Portorož 2015 / [ed] Alojz Križman; Mirjam Jan-Blažič; Martin Debelak; Peter Schumacher; Rüdiger Deike, Ljubljana: Društvo livarjev Slovenije , 2015, p. 35-Conference paper, Published paper (Refereed)
Abstract [en]

One of the oldest high alloys white cast irons is produced commercially when the chromium content is between 23 and 28 %. The high-chromium white irons have excellent abrasion resistance and are used effectively in slurry pumps, brick molds, coal-grinding mills, rolling mill rolls, shot blasting equipment, and components for quarrying, hard-rock mining and milling.

The specifications and requirements applied for the white cast iron components are among the most stringent used within the iron foundry branch. One of the biggest problems for the production of these components is hot tearing or hot cracking, or hot shortness. Irrespective of the name, this phenomenon represents the formation of an irreversible failure (crack) in the still semisolid casting.

This paper will show a study of the effect of cooling rate on the cracks. The procedure to achieve this was to study one casting component, impeller, in a production scale using different cooling rate after pouring.

In this work it has been shown that the solidification rate has a strong effect on the hot cracking.

Place, publisher, year, edition, pages
Ljubljana: Društvo livarjev Slovenije, 2015
National Category
Metallurgy and Metallic Materials
Research subject
Technology (byts ev till Engineering), Mechanical Engineering
Identifiers
urn:nbn:se:lnu:diva-50111 (URN)978-961-93723-1-9 (ISBN)
Conference
55th International Foundry Conference Portorož 2015, 16th to 18th September 2015
Available from: 2016-03-02 Created: 2016-03-02 Last updated: 2016-04-14Bibliographically approved
Svidró, P., Elmquist, L., Dugic, I. & Diószegi, A. (2014). Characterization of primary dendrite morphology in complex shaped lamellar cast iron castings. In: The 10th International Symposium on the Science and Processing of Cast Iron, SPCI10, November, 2014, Mar del Plata, Argentina: . Paper presented at Proceedings of the 10th International Symposium on the Science and Processing of Cast Iron, SPCI10, November, 2014, Mar del Plata, Argentina (pp. 1-7).
Open this publication in new window or tab >>Characterization of primary dendrite morphology in complex shaped lamellar cast iron castings
2014 (English)In: The 10th International Symposium on the Science and Processing of Cast Iron, SPCI10, November, 2014, Mar del Plata, Argentina, 2014, p. 1-7Conference paper, Published paper (Refereed)
Abstract [en]

Shrinkage porosity and metal expansion penetration are two fundamental defects appearing during the production of complex shaped lamellar cast iron components. Simplified test models simulating the thermal and geometrical conditions existing in complex shaped castings have been successfully used to provoke shrinkage porosity and metal expansion penetration. A stereological investigation of the primary dendrite morphology indicates a maximum intra-dendritic space in connection with the casting surface where the porosity and the penetration defects appear. Away from the defect formation area the intra-dendritic space decreases. Comparison of the simulated local solidification times and measured intra-dendritic space indicates a strong relation which can be explained by the dynamic ripening process. The slow local solidification time situated at the boundary between the casting surface and its surrounding is explained to be the reason for the formation of an austenite morphology which can promote mass flow between dendrites, thereby provoking shrinkage porosity or metal expansion penetration.

Keywords
lamellar cast iron, primary austenite, dendrite morphology, coarsening, shrinkage porosity, metal expansion penetration
National Category
Metallurgy and Metallic Materials
Research subject
Technology (byts ev till Engineering)
Identifiers
urn:nbn:se:lnu:diva-51053 (URN)
Conference
Proceedings of the 10th International Symposium on the Science and Processing of Cast Iron, SPCI10, November, 2014, Mar del Plata, Argentina
Available from: 2015-07-28 Created: 2016-03-18 Last updated: 2016-03-24Bibliographically approved
Dugic, I. (2014). Effect of molybdenum content and pouring temperature on the casting defects of high chromium white cast iron for the impellers. In: Unkić, Faruk (Ed.), Proceeding book of the 14th international foundrymen conference: . Paper presented at 14th International Foundrymen Conference Development and Optimization of the Castings Production Processes, May 15 - 16, 2014, Opatija, Croatia (pp. 17:1-17:8). Sisak, Croatia: University of Zagreb, Faculty of Metallurgy
Open this publication in new window or tab >>Effect of molybdenum content and pouring temperature on the casting defects of high chromium white cast iron for the impellers
2014 (English)In: Proceeding book of the 14th international foundrymen conference / [ed] Unkić, Faruk, Sisak, Croatia: University of Zagreb, Faculty of Metallurgy , 2014, , p. 10p. 17:1-17:8Conference paper, Published paper (Other academic)
Abstract [en]

White cast iron components are today used in central parts for pumps. The specifications and requirements applied for the white cast iron components are among the most stringent used within the iron foundry branch. One of the problems for the production of these components can be cracks. Because of this reason there are just a few iron foundries in Sweden that are able to cast the required high quality white cast iron components.

The project work has focused on reducing the cracks and to improve the machining properties of the casting. The experiments showed that molybdenum content and pouring temperature had an important influence on casting defects and machining of the casting components behaviour.

Place, publisher, year, edition, pages
Sisak, Croatia: University of Zagreb, Faculty of Metallurgy, 2014. p. 10
Keywords
White cast iron, molybdenum, impeller, cracks and casting
National Category
Metallurgy and Metallic Materials
Research subject
Technology (byts ev till Engineering), Mechanical Engineering
Identifiers
urn:nbn:se:lnu:diva-34423 (URN)978-953-7082-17-8 (ISBN)
Conference
14th International Foundrymen Conference Development and Optimization of the Castings Production Processes, May 15 - 16, 2014, Opatija, Croatia
Available from: 2014-05-27 Created: 2014-05-27 Last updated: 2016-04-08Bibliographically approved
Holmgren, M., Dugic, I. & Liljenfors, T. (2014). Purification of hydrogen in aluminium recycling. In: Unkić, Faruk (Ed.), Proceeding book of the 14th international foundrymen conference: . Paper presented at 14th International Foundrymen Conference Development and Optimization of the Castings Production Processes, May 15 - 16, 2014, Opatija, Croatia (pp. 17:1-17:8). Sisak, Croatia: University of Zagreb Faculty of Metallurgy
Open this publication in new window or tab >>Purification of hydrogen in aluminium recycling
2014 (English)In: Proceeding book of the 14th international foundrymen conference / [ed] Unkić, Faruk, Sisak, Croatia: University of Zagreb Faculty of Metallurgy , 2014, , p. 9p. 17:1-17:8Conference paper, Published paper (Other academic)
Abstract [en]

Second to steel, aluminium is the most widely used metal and its applications are manifold. It is available in all forms; such is wire, bars, extrusions, power, forging and casting. One of the major characteristics of aluminium is that it is very well suited for recycling. Recycled aluminium is known as secondary aluminium, but maintains the same physical properties as primary aluminium.

 The Company XY is a cast house in the Nordic countries supplying aluminium cast products. Customers today are placing greater demands on the products strength and quality. An important quality parameter of aluminium is its purity from contaminants, where hydrogen is one of the major issues with impact on the strength of the final product.

 The hydrogen content has been measured by Density Index for two different types of alloys (EN AB-43400 and EN AB-46000), at specific locations, at different stages in the process and with different degassing methods. Density Index is a measure for measuring and comparing the samples with respect to the internal porosity. As the air contains moisture, along with the melt temperature, the solubility of hydrogen in the melt is affected.

 The project work has focused on reducing the hydrogen content and to improve the strength of the final product. 

Place, publisher, year, edition, pages
Sisak, Croatia: University of Zagreb Faculty of Metallurgy, 2014. p. 9
Keywords
Aluminium, Recycling, Hydrogen, Density Index
National Category
Materials Engineering Metallurgy and Metallic Materials
Research subject
Technology (byts ev till Engineering), Mechanical Engineering
Identifiers
urn:nbn:se:lnu:diva-34422 (URN)978-953-7082-17-8 (ISBN)
Conference
14th International Foundrymen Conference Development and Optimization of the Castings Production Processes, May 15 - 16, 2014, Opatija, Croatia
Available from: 2014-05-27 Created: 2014-05-27 Last updated: 2016-04-08Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-0453-0503

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