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Metals 2019, 9(2), 249; https://doi.org/10.3390/met9020249

Thermal Simulation Study on the Solidification Structure and Segregation of a Heavy Heat-Resistant Steel Casting

1
Materials Genome Institute, Shanghai University, Shanghai 200444, China
2
School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China
3
Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), Shandong University, Jinan 250061, China
4
Shanghai Honggang Power Station Equipment Casting & Forging Co., Ltd., Shanghai 200240, China
5
Shougang Research Institute of Technology, Beijing 100043, China
*
Author to whom correspondence should be addressed.
Received: 13 January 2019 / Revised: 3 February 2019 / Accepted: 13 February 2019 / Published: 20 February 2019
(This article belongs to the Special Issue Advanced Simulation Technologies of Metallurgical Processing)
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Abstract

The prediction and controlling of the solidification structure and macro-segregation in heavy steel casting, which is usually produced in limited quantities, was a conundrum in the foundry field. In this work, the cooling and solidification processes of a 16 t CB2 ferritic heat-resistant steel (FHRS) valve casting were reproduced by studying the solidification behavior of three typical units through a thermal simulation method. The results indicate that the types of casting without chilling have the most uneven distribution of solutes and hardness, while those types of casting in which parts are solidified by chilling are much more uniform. The macro-segregation degrees of B, C, Nb, P, Cr, Mo, Si, V and Mn decrease gradually during heavy casting of CB2 ferritic heat-resistant steel. Of them, B, C, Nb, and P are solutes prone to segregation, and the maximum macro-segregation index of B can even reach 15. The macro-segregation tendencies of Cr, Mo, Si, V, and Mn are relatively small. Further studies on the last solidification portion of samples taken by electron microprobe reveal that large-sized precipitates such as MnS and NbxC are easily formed due to solute enrichment, and the sizes of these precipitates were distributed from dozens to hundreds of micrometers. View Full-Text
Keywords: heavy casting; thermal simulation; ferritic heat-resistant steel; macro-segregation heavy casting; thermal simulation; ferritic heat-resistant steel; macro-segregation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Wang, B.; Zhong, H.; Li, X.; Wang, X.; Wu, T.; Liu, Q.; Zhai, Q. Thermal Simulation Study on the Solidification Structure and Segregation of a Heavy Heat-Resistant Steel Casting. Metals 2019, 9, 249.

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