摘要
采用两阶段控轧控冷工艺轧制低碳贝氏体高强钢,在不同温度下进行一定时间的回火处理,检测回火处理前后钢板的力学性能,并对比分析了显微组织。结果表明,析出强化在回火处理前后起主导作用;随着回火温度的提高,组织从粒状贝氏体向准多边形铁素体过渡;在600～750℃进行回火处理,试验钢中的析出相粒子均匀弥散析出,屈服强度上升了90～135 MPa,抗拉强度上升了15～55 MPa;准多边形铁素体组织在-20℃的冲击功不低于30 J。
A low carbon bainitic （LCB） steel was tempered at different temperatures after controlled roiling and controlled cooling. The mechanical properties of the LCB steel before and after tempering treatment were tested and its microstructure was also examined. The results show that the precipitation strengthening plays a key role in the rolled steel both before and after tempering. The microstructure of the roiled steel changes from granular bainite to quasi-polygonal ferrite gradually with increasing tempering temperature. The uniformly distributed precipitates are observed in the tested steel tempered at 600 - 750 ℃. The yield strength and tensile strength of the steel tempered at 600-750 ℃ increases by 90- 135 MPa and 15 -55 MPa, respectively, compared with that of the as-rolled steel while the impact energy at - 20 ℃ of the tested steel with quasi-polygonal ferrite is not lower than 30 J.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2013年第8期105-110,共6页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金项目(50975190)
关键词
回火
贝氏体钢
析出强化
析出相粒子
tempering
bainitic steel
precipitation strengthening
precipitated phase particles
