Effect of alloying elements on austenite grain growth and microstructure refinement in a non-quenched steel for crankshafts
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摘要: 通過研究曲軸用非調質鋼奧氏體晶粒長大行為和分析工業生產熱軋材的顯微組織,探討合金元素Nb、Ti和S的組織細化作用.結果表明:添加質量分數0.027%Nb和0.012%Ti,同時S從0.029%提高到0.046%,加熱時間30 min時,能夠把奧氏體晶粒粗化溫度提高100℃,并明顯細化熱軋材邊部組織.彌散分布、釘扎在奧氏體晶界上的未溶第二相粒子MnS和(Nb,Ti)(C,N),能夠有效抑制奧氏體晶粒的長大.在熱加工過程中,合金元素的組織細化作用需要適當的變形制度予以匹配,才能得以體現.Abstract: The microstructural refinement effect of alloying elements Nb, Ti and S was investigated by analyzing austenite grain growth behavior and hot-rolled microstructure in a non-quenched steel for crankshafts. The results show that the austenite grain coarsening temperature increases by 100℃ when the heating time is 30 min, and the microstructure in the hot-rolled bar edge is significantly refined after 0.027% Nb-0.012% Ti microalloying and an increase of S from 0.029% to 0.046% in the steel investigated. The undissolved second phase particles MnS and (Nb, Ti) (C, N) have a pinning effect on austenite grain boundaries, and then retard the austenite grain growth. Besides, the microstructural refinement effect of the alloying elements needs a suitable deformation schedule.
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Key words:
- steel alloying /
- alloying elements /
- austenite /
- grain growth /
- microstructure refinement /
- crankshafts
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