Phase Transformation Behaviors of Medium Carbon Steels Produced by Twin Roll Casting and Compact Strip Production Processes

Medium carbon steels have been widely used in the fields of tool and die manufacturing due to their outstanding hardness and wear resistance. In this study, microstructures of 50# steel strips fabricated by twin roll casting (TRC) and compact strip production (CSP) processes were analyzed to investi...

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Main Authors: Shaohua Li, Haibo Feng, Shuize Wang, Junheng Gao, Haitao Zhao, Honghui Wu, Shuai Xu, Qingxiao Feng, Hualong Li, Xinyuan Liu, Guilin Wu
Format: Article
Language:English
Published: MDPI AG 2023-02-01
Series:Materials
Subjects:
Online Access:https://www.mdpi.com/1996-1944/16/5/1980
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author Shaohua Li
Haibo Feng
Shuize Wang
Junheng Gao
Haitao Zhao
Honghui Wu
Shuai Xu
Qingxiao Feng
Hualong Li
Xinyuan Liu
Guilin Wu
author_facet Shaohua Li
Haibo Feng
Shuize Wang
Junheng Gao
Haitao Zhao
Honghui Wu
Shuai Xu
Qingxiao Feng
Hualong Li
Xinyuan Liu
Guilin Wu
author_sort Shaohua Li
collection DOAJ
description Medium carbon steels have been widely used in the fields of tool and die manufacturing due to their outstanding hardness and wear resistance. In this study, microstructures of 50# steel strips fabricated by twin roll casting (TRC) and compact strip production (CSP) processes were analyzed to investigate the influences of solidification cooling rate, rolling reduction, and coiling temperature on composition segregation, decarburization, and pearlitic phase transformation. The results show that a partial decarburization layer with a thickness of 13.3 μm and banded C-Mn segregation were observed in the 50# steel produced by CSP, leading to the banded distributions of ferrite and pearlite in the C-Mn poor regions and C-Mn rich regions, respectively. For the steel fabricated by TRC, owing to the sub-rapid solidification cooling rate and short processing time at high temperatures, neither apparent C-Mn segregation nor decarburization was observed. In addition, the steel strip fabricated by TRC has higher pearlite volume fractions, larger pearlite nodule sizes, smaller pearlite colony sizes and interlamellar spacings due to the co-influence of larger prior austenite grain size and lower coiling temperatures. The alleviated segregation, eliminated decarburization and large volume fraction of pearlite render TRC a promising process for medium carbon steel production.
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spelling doaj.art-e1ffc34d07c04354872a7b079ba1b4312023-11-17T08:05:40ZengMDPI AGMaterials1996-19442023-02-01165198010.3390/ma16051980Phase Transformation Behaviors of Medium Carbon Steels Produced by Twin Roll Casting and Compact Strip Production ProcessesShaohua Li0Haibo Feng1Shuize Wang2Junheng Gao3Haitao Zhao4Honghui Wu5Shuai Xu6Qingxiao Feng7Hualong Li8Xinyuan Liu9Guilin Wu10Innovation Research Institute for Carbon Neutrality, University of Science and Technology Beijing, Beijing 100083, ChinaInnovation Research Institute for Carbon Neutrality, University of Science and Technology Beijing, Beijing 100083, ChinaInnovation Research Institute for Carbon Neutrality, University of Science and Technology Beijing, Beijing 100083, ChinaInnovation Research Institute for Carbon Neutrality, University of Science and Technology Beijing, Beijing 100083, ChinaInnovation Research Institute for Carbon Neutrality, University of Science and Technology Beijing, Beijing 100083, ChinaInnovation Research Institute for Carbon Neutrality, University of Science and Technology Beijing, Beijing 100083, ChinaInnovation Research Institute for Carbon Neutrality, University of Science and Technology Beijing, Beijing 100083, ChinaInstitute of Research of Iron and Steel, Shasteel, Zhangjiagang 215625, ChinaInstitute of Research of Iron and Steel, Shasteel, Zhangjiagang 215625, ChinaInstitute of Research of Iron and Steel, Shasteel, Zhangjiagang 215625, ChinaInnovation Research Institute for Carbon Neutrality, University of Science and Technology Beijing, Beijing 100083, ChinaMedium carbon steels have been widely used in the fields of tool and die manufacturing due to their outstanding hardness and wear resistance. In this study, microstructures of 50# steel strips fabricated by twin roll casting (TRC) and compact strip production (CSP) processes were analyzed to investigate the influences of solidification cooling rate, rolling reduction, and coiling temperature on composition segregation, decarburization, and pearlitic phase transformation. The results show that a partial decarburization layer with a thickness of 13.3 μm and banded C-Mn segregation were observed in the 50# steel produced by CSP, leading to the banded distributions of ferrite and pearlite in the C-Mn poor regions and C-Mn rich regions, respectively. For the steel fabricated by TRC, owing to the sub-rapid solidification cooling rate and short processing time at high temperatures, neither apparent C-Mn segregation nor decarburization was observed. In addition, the steel strip fabricated by TRC has higher pearlite volume fractions, larger pearlite nodule sizes, smaller pearlite colony sizes and interlamellar spacings due to the co-influence of larger prior austenite grain size and lower coiling temperatures. The alleviated segregation, eliminated decarburization and large volume fraction of pearlite render TRC a promising process for medium carbon steel production.https://www.mdpi.com/1996-1944/16/5/1980twin roll castingcompact strip productionsegregationdecarburizationphase transformation
spellingShingle Shaohua Li
Haibo Feng
Shuize Wang
Junheng Gao
Haitao Zhao
Honghui Wu
Shuai Xu
Qingxiao Feng
Hualong Li
Xinyuan Liu
Guilin Wu
Phase Transformation Behaviors of Medium Carbon Steels Produced by Twin Roll Casting and Compact Strip Production Processes
Materials
twin roll casting
compact strip production
segregation
decarburization
phase transformation
title Phase Transformation Behaviors of Medium Carbon Steels Produced by Twin Roll Casting and Compact Strip Production Processes
title_full Phase Transformation Behaviors of Medium Carbon Steels Produced by Twin Roll Casting and Compact Strip Production Processes
title_fullStr Phase Transformation Behaviors of Medium Carbon Steels Produced by Twin Roll Casting and Compact Strip Production Processes
title_full_unstemmed Phase Transformation Behaviors of Medium Carbon Steels Produced by Twin Roll Casting and Compact Strip Production Processes
title_short Phase Transformation Behaviors of Medium Carbon Steels Produced by Twin Roll Casting and Compact Strip Production Processes
title_sort phase transformation behaviors of medium carbon steels produced by twin roll casting and compact strip production processes
topic twin roll casting
compact strip production
segregation
decarburization
phase transformation
url https://www.mdpi.com/1996-1944/16/5/1980
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