Effects of TMCP Parameters on the Microstructure and Mechanical Properties of Nb-bearing Spring Steel

摘要：

The effects of TMCP parameters, such as finish rolling temperature and cooling rate on the microstructure and mechanical properties of Nb-bearing spring steel were investigated by thermal simulation, quantitative metallography and tensile test. And the precipitation in Nb-bearing spring steel was analysis by electron microscopy. Experimental results indicate that the higher finish rolling temperature or the more rapid cooling rate in a given range, the less the proeutectoid ferrite content and the thinner the interlamellar spacing is. Reasonably higher finish rolling temperature followed by properly higher cooling rate is suggested to improve the mechanical properties of Nb-bearing spring steel. Micro-addition of niobium decreases the proeutectoid ferrite content and the interlamellar spacing and leads to forming degenerated pearlite. The precipitation of size range ～20-50 nm in Nb-bearing spring steel occurred at the lamellar ferrite of pearlite and the proeutectoid ferrite.

关键词： spring steel niobium controlled rolling and cooling microstructure mechanical properties

作者: ZHANG Chao-lei LIU Ya-zheng ZHOU Le-yu JIANG Chao SUN Xiao-jun

作者单位: School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 10083, 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: 469-472

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）