Effect of Nb on Microstructure and Mechanical Property of High Strength Hot-Rolled Dual Phase Steel

摘要：

　　In according with the transformation rules of C-Si-Mn-Cr-Mo and C-Si-Mn-Cr-Mo-Nb tested steels,thermal mechanical experiment and rolling experiment of tested steels were carried out in lab.The effects of Nb on microstructure and property of high strength hot rolled dual phase steels were analyzed.It is shown that Nb retards ferrite transformation,reduces ferrite volume fraction and refines the ferrite grain size and martensite colony size.After micro-alloying of 0.047wt%Nb,yield strength and tensile strength increase by 145MPa and 135MPa respectively under medium temperature coiling process.YS/TS ratio increases from 0.51 to 0.62,meanwhile,elongation reduces from 24.8% to 23.6%,and the decrease of elongation is not obvious.That is to say,the grain refining strengthening and precipitation strengthening of Nb micro-alloying is effective to enhance the strength grade of hot rolled DP steel coiled at medium temperature.

关键词： Nb micro-alloying hot-rolled DP steel microstructure evolution mechanical property

作者: ZHOU Leyu LIU Yazheng ZHANG Dan SONG Renbo

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

会议类型: 国际会议

会议名称: Asia Steel International conference 2012(第五届亚洲钢铁大会)

会议地点: 北京

会议语种:英文

页码: 1-4

在线出版日期: 2012-09-23（万方平台首次上网日期，不代表论文的发表时间）