Effect of Alloying Element on Process Control of High Strength Hot-Rolled Dual Phase Steel

摘要：

Microstructure evolution of C-Si-Mn-Nb, C-Si-Mn-Cr-Nb and C-Si-Mn-Cr-Mo-Nb tested steels during step-cooling process were studied. Effects of alloying element and process data on microstructure and mechanical properties of high strength Nb bearing DP steel were analyzed, to illustrate the relationship between alloy composition design and process control stability during DP microstructure and property control. It is shown that, 700MPa ferrite and martensite DP steel is obtained respectively by three kinds of composition tested steel under different step-cooling process. C-Si-Mn-Nb steel with simple alloying design of low cost is provided with low hardenability, and has strong process sensibility during microstructure evolution. DP microstructure of ferrite and martensite of C-Si-Mn-Nb steel just can be obtained by coiling at low temperature of 250℃. The process control stability of C-Si-Mn-Cr-Nb steel is stronger than that of C-Si-Mn-Nb steel, to obtain DP microstructure by coiling at low temperature. C-Si-Mn-Cr-Mo-Nb steel with complex alloying design of high cost is provided with excellent process control stability. Alloy element Mo can promote stabilizing of metastable austenite to obtain F+M DP microstructure by coiling at medium temperature of 600℃.

关键词： hot-rolled DP steel process control step-cooling microstructure evolution

作者: ZHOU Le-yu LIU Ya-zheng HU Xue-wen ZHANG Da-wei

作者单位: School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China

会议类型: 国际会议

会议名称: The 6th International Conference on High Strength Low Alloy Steels(第六届高强度低合金钢国际会议HSLA Steels2011)

会议地点: 北京

会议语种:英文

页码: 815-818

在线出版日期: 2011-05-31（万方平台首次上网日期，不代表论文的发表时间）