加钛的镍铬钢回火脆性的锑非平衡晶界偏聚机理  

Mechanism of Non-Equilibrium Grain-Boundary Sb Segregation for Temper Embrittlement of Ti-Doped NiCr Steel

作　　者：谢颖 郭二军[2] 李庆芬[3] 杨尚林[3] 李莉[3] 郑卫 金国 张菊[4] 胡艳华 刘二保[3] 

机构地区：[1]天津市塘沽区河华里11栋302号,天津300450 [2]哈尔滨理工大学材料科学与工程学院,黑龙江哈尔滨150080 [3]哈尔滨工程大学机电工程学院,黑龙江哈尔滨150001 [4]装甲兵工程学院机械工程系,北京100072

出　　处：《钢铁研究学报》2006年第1期39-43,共5页Journal of Iron and Steel Research

摘　　要：回火脆性的溶质非平衡晶界偏聚机理的本质是溶质非平衡晶界偏聚的临界时间引起回火脆性的临界时间。在此基础上,研究了加钛的镍铬钢回火脆性的临界时间、回火脆性的极大值和充分回火后2.7J脆-韧转变温度随回火温度的变化,并结合锑的非平衡晶界偏聚量的测量结果,论述了加钛的镍铬钢中回火脆性的锑的非平衡晶界偏聚机理。The most characteristic aspect of non-equilibrium grain boundary segregation mechanism of temper embrittlement is that the critical time in a non-equilibrium segregation isotherms will induce a critical time in the relative temper embrittlement isotherms. On the basis of this concept and measured Sb grain-boundary segregation at different temperatures, the non equilibrium Sb segregation mechanism for temper embrittlement of Ti-doped NiCr steel is discussed according to the relationships of ageing temperature to maximum temper embrittlement, critical time of temper embrittlement, and temper embrittlement after long enough ageing.

关 键 词：回火脆性 非平衡晶界偏聚 临界时间 镍铬 钢 

分 类 号：TG156.5[金属学及工艺—热处理]