Thermal Simulation Study on the Solidification Structure and Segregation of a Heavy Heat-Resistant Steel Casting
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...
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2019-02-01
|
| Series: | Metals |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2075-4701/9/2/249 |
| _version_ | 1819150549104197632 |
|---|---|
| author | Biao Wang Honggang Zhong Xihao Li Xiebin Wang Tieming Wu Qingmei Liu Qijie Zhai |
| author_facet | Biao Wang Honggang Zhong Xihao Li Xiebin Wang Tieming Wu Qingmei Liu Qijie Zhai |
| author_sort | Biao Wang |
| collection | DOAJ |
| description | 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 Nb<i><sub>x</sub></i>C are easily formed due to solute enrichment, and the sizes of these precipitates were distributed from dozens to hundreds of micrometers. |
| first_indexed | 2024-12-22T14:19:16Z |
| format | Article |
| id | doaj.art-f491e95b44fb4886b778a4b421341a60 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-12-22T14:19:16Z |
| publishDate | 2019-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-f491e95b44fb4886b778a4b421341a602022-12-21T18:23:02ZengMDPI AGMetals2075-47012019-02-019224910.3390/met9020249met9020249Thermal Simulation Study on the Solidification Structure and Segregation of a Heavy Heat-Resistant Steel CastingBiao Wang0Honggang Zhong1Xihao Li2Xiebin Wang3Tieming Wu4Qingmei Liu5Qijie Zhai6Materials Genome Institute, Shanghai University, Shanghai 200444, ChinaMaterials Genome Institute, Shanghai University, Shanghai 200444, ChinaSchool of Materials Science and Engineering, Shanghai University, Shanghai 200444, ChinaKey Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), Shandong University, Jinan 250061, ChinaShanghai Honggang Power Station Equipment Casting & Forging Co., Ltd., Shanghai 200240, ChinaShougang Research Institute of Technology, Beijing 100043, ChinaMaterials Genome Institute, Shanghai University, Shanghai 200444, ChinaThe 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 Nb<i><sub>x</sub></i>C are easily formed due to solute enrichment, and the sizes of these precipitates were distributed from dozens to hundreds of micrometers.https://www.mdpi.com/2075-4701/9/2/249heavy castingthermal simulationferritic heat-resistant steelmacro-segregation |
| spellingShingle | Biao Wang Honggang Zhong Xihao Li Xiebin Wang Tieming Wu Qingmei Liu Qijie Zhai Thermal Simulation Study on the Solidification Structure and Segregation of a Heavy Heat-Resistant Steel Casting Metals heavy casting thermal simulation ferritic heat-resistant steel macro-segregation |
| title | Thermal Simulation Study on the Solidification Structure and Segregation of a Heavy Heat-Resistant Steel Casting |
| title_full | Thermal Simulation Study on the Solidification Structure and Segregation of a Heavy Heat-Resistant Steel Casting |
| title_fullStr | Thermal Simulation Study on the Solidification Structure and Segregation of a Heavy Heat-Resistant Steel Casting |
| title_full_unstemmed | Thermal Simulation Study on the Solidification Structure and Segregation of a Heavy Heat-Resistant Steel Casting |
| title_short | Thermal Simulation Study on the Solidification Structure and Segregation of a Heavy Heat-Resistant Steel Casting |
| title_sort | thermal simulation study on the solidification structure and segregation of a heavy heat resistant steel casting |
| topic | heavy casting thermal simulation ferritic heat-resistant steel macro-segregation |
| url | https://www.mdpi.com/2075-4701/9/2/249 |
| work_keys_str_mv | AT biaowang thermalsimulationstudyonthesolidificationstructureandsegregationofaheavyheatresistantsteelcasting AT honggangzhong thermalsimulationstudyonthesolidificationstructureandsegregationofaheavyheatresistantsteelcasting AT xihaoli thermalsimulationstudyonthesolidificationstructureandsegregationofaheavyheatresistantsteelcasting AT xiebinwang thermalsimulationstudyonthesolidificationstructureandsegregationofaheavyheatresistantsteelcasting AT tiemingwu thermalsimulationstudyonthesolidificationstructureandsegregationofaheavyheatresistantsteelcasting AT qingmeiliu thermalsimulationstudyonthesolidificationstructureandsegregationofaheavyheatresistantsteelcasting AT qijiezhai thermalsimulationstudyonthesolidificationstructureandsegregationofaheavyheatresistantsteelcasting |