Numerical analysis of effect of the solutes on formation of MnS in non-tempered steel |
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| Authors: | Jian-bo Xie De-lin Hu Jian-xun Fu Hui Liu |
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| Affiliation: | 1. State Key Laboratory of Advanced Special Steel Metallurgy and Preparation, School of Materials Science and Engineering, Shanghai University, Shanghai, People’s Republic of Chinafujianxun@shu.edu.cn fujianxun@sina.com;3. State Key Laboratory of Advanced Special Steel Metallurgy and Preparation, School of Materials Science and Engineering, Shanghai University, Shanghai, People’s Republic of China |
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| Abstract: | To analyse the effects of solute elements on formation of MnS in the micro-alloyed non-tempered steel, a novel coupling model of micro-segregation and MnS precipitation during solidification was built using the finite-difference method. Non-tempered 49MnVS3 steel was used to detect the effects of concentrations of elements on the precipitation behaviour of MnS. The results show that with contents of Mn at 0.05～2%, S at 0.001～0.3%, Si at 0.3～0.7%, P at 0.001～0.05%, C at 0.05～1.0%, the precipitation temperature of MnS raised from 1360 to 1432°C, 1397 to 1447°C, 1425 to 1418°C, 1425 to 1418°C, dropped from 1488 to 1358°C, and its precipitation solidification ratio dropped from 1 to 0.785, 1 to 0.51, 0.883 to 0.866, 0.88 to 0.86, 0.96 to 0.77, respectively; the observed temperature of MnS by HT-SM was 1427.2°C, close to the calculated temperature of 1420.6°C by the proposed the diffusion control growth model. |
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| Keywords: | Micro-alloyed non-tempered steel coupling micro-segregation solidification MnS precipitation |
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