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Quantitative effects of phase transition on solute partition coefficient, inclusion precipitation, and microsegregation for high-sulfur steel solidification
Chongqing Univ, Coll Mat Sci & Engn, State Key Lab Coal Mine Disaster Dynam & Control, Chongqing 400044, Peoples R China.;Chongqing Univ, Chongqing Key Lab Vanadium Titanium Met & New Mat, Chongqing 400044, Peoples R China..
Chongqing Univ, Coll Mat Sci & Engn, State Key Lab Coal Mine Disaster Dynam & Control, Chongqing 400044, Peoples R China.;Chongqing Univ, Chongqing Key Lab Vanadium Titanium Met & New Mat, Chongqing 400044, Peoples R China..
Chongqing Univ, Coll Mat Sci & Engn, State Key Lab Coal Mine Disaster Dynam & Control, Chongqing 400044, Peoples R China.;Chongqing Univ, Chongqing Key Lab Vanadium Titanium Met & New Mat, Chongqing 400044, Peoples R China..
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
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2019 (English)In: Journal of Materials Science & Technology, ISSN 1005-0302, Vol. 35, no 10, p. 2383-2395Article in journal (Refereed) Published
Abstract [en]

Segregation and inclusion precipitation are the common behaviours of steel solidification, which are resulted from the redistribution and diffusion of the solute elements at the solid-liquid interface. The effect of the phase transition of high-sulfur free-cutting steel is quantified in the present work for the solute partition coefficient (k(i)), inclusion precipitation, and microsegregation by establishing a coupling model of microsegregation and inclusion precipitation, wherein the quantified dependencies of k(i) in terms of temperature, phase and carbon temperature range and phase transition of high-sulfur steel that under different solidification paths and C contents were quite different, leading to differences in k(i) and eventually in microsegregation. k k(p), and k(s) were mainly affected by phase composition and k(si) was primarily by temperature, while k(mn) depended on both phase composition and temperature during solidification. Increasing the C content within the interval 0.07-0.48 wt%, the 'proportion of the delta phase maintained temperature region during solidification' (P-delta), k(p)(ave) and k(s)(ave) (k(i)(ave) the average value of the k(i) across the whole stages of solidification) decreased monotonically, whereas k phase composition and k(i), leading to the change in microsegregation. Such effect of the peritectic reaction was more significant at the last stage of solidification. When the P-delta was between 75% and 100% (corresponding to 0.07-0.16 wt% C), the solidification path resulted in a greater effect on the microsegregation of solutes C, P, and S because of the peritectic reaction. The microsegregation of solutes Mn and S were comprehensively influenced by k(Mn), k(s) and MnS precipitation as well. The studies would help reveal the solute redistribution at the solid-liquid interface, and improve the segregation of high-sulfur steel by controlling the solidification and precipitation in practice.

Place, publisher, year, edition, pages
JOURNAL MATER SCI TECHNOL , 2019. Vol. 35, no 10, p. 2383-2395
Keywords [en]
Phase transition, Microsegregation, Solute partition coefficient, Inclusion precipitation, High-sulfur steel
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-261004DOI: 10.1016/j.jmst.2019.05.058ISI: 000484531600035Scopus ID: 2-s2.0-85070602811OAI: oai:DiVA.org:kth-261004DiVA, id: diva2:1357221
Conference
YNE TW, 1981, METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, V12, P965 jcek Pavel, 2017, JOURNAL OF MATERIALS SCIENCE, V52, P5822
Note

QC 20191003

Available from: 2019-10-03 Created: 2019-10-03 Last updated: 2019-10-03Bibliographically approved

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Dong, ZhihuaVitos, Levente

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