回火温度对Nb-Mo-V微合金钢中的析出物的影响  

Influence of tempering temperature on precipitates in Nb-Mo-V micro-alloyed steel

作　　者：王泽民[1] 刘庆冬[1] 刘文庆[1] 

机构地区：[1]上海大学微结构研究重点实验室,上海200444

出　　处：《材料热处理学报》2009年第3期123-126,共4页Transactions of Materials and Heat Treatment

基　　金：上海市纳米专项项目(0552nm049);上海市重点学科资助项目(T0101)

摘　　要：把Nb—Mo—V微合金钢在1200℃固溶0．5h后淬火，在450～650℃回火4h，用透射电镜（TEM）和三维原子探针（3DAP）分析回火组织演变和碳化物的析出特征。结果表明，随回火温度增加，高能马氏体向低能铁素体转变过程中伴随着数量和大小不同的碳化物析出，其中600℃回火样品中C-Nb-Mo-V团簇的数量密度最大，对应二次硬化的硬度峰值。在碳化物形成过程中，Nb和V比Mo优先形成碳化物。Three dimensional atom probe（3DAP） and transmission electron microscopy（TEM） were applied to investigate the carbides precipitated in a Nb-Mo-V micro-alloyed steel tempered at 450 - 650℃ for 4h after solution treatment at 1200℃ for 0.5h. The results indicate that the carbides precipitated with different number and size in the process of martensite transforming to ferrite with tempering temperature increasing. The highest number and density of C-Nb-Mo-V clusters is obtained at 600℃ tempering, which corresponds to the strongest secondary harden effect. During the tempering, vanadium and niobium are priority in forming carbides compared to molybdenum.

关 键 词：三维原子探针 微合金钢 碳化物 回火 

分 类 号：TG162.83[金属学及工艺—热处理] TU142.33[金属学及工艺—金属学]