回火温度对Q960钢小角度晶界的影响  

Effect of tempering temperature on low angle grain boundaries in Q960 steel

作　　者：于浩[1] 张道达 肖荣亭[1] 周平[3] 董杰吉[3] 杜显彬[3] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]通裕重工股份有限公司,德州251200 [3]莱芜钢铁集团有限公司,莱芜271104

出　　处：《北京科技大学学报》2011年第8期952-957,共6页Journal of University of Science and Technology Beijing

摘　　要：设计了一种低合金高强度的Q960工程机械用钢.在同种成分、同种轧制和淬火工艺下,研究回火温度对Q960钢小角度晶界的影响机理.经分析得出,随着回火温度的升高,小角度晶界的频率逐渐降低且实验钢的抗拉强度和屈服强度也相应地降低,而屈强比逐渐升高.不同回火温度下小角度晶界频率的峰值均出现在取向差5°附近,即取向差较小.取向差小使得小角度晶界比较稳定,原子迁移率小.通过计算键级积分(BOI)得出,B元素对Q960钢的小角度晶界有加强作用.A low-alloy high-strength steel Q960 for construction machinery was designed.Under the condition of homogeneous composition,homogeneous rolling and quenching techniques,a mechanism was researched to describe the influence of tempering temperature on low angle grain boundaries in Q960 steel.It is shown that with the rising of tempering temperature,the frequency of low angle grain boundaries as well as the tensile strength and yield strength of Q960 steel gradually decreases,but the tensile ratio increases.At different tempering temperatures,the peak value of the frequency of low angle grain boundaries is about at a misorientation of 5°,so the misorientation is small.Because of the small misorientation,the low angle grain boundaries are quite stable and the atomic mobility ratio is also very small.According to the calculation of bond order integrals（BOI）,B element can strengthen low angle grain boundaries in Q960 steel.

关 键 词：高强钢 回火 晶界 位错 板条马氏体 取向差 力学性能 

分 类 号：TG156.1[金属学及工艺—热处理]