马氏体钢中(Ti,Mo)C粒子的析出行为和强化效应  

Precipitation Behavior and Strengthening Effect of(Ti,Mo)C Particles in a Martensitic Steel

作　　者：靳晓坤 徐乐[3] 尉文超 姚可夫[2] 时捷[3] 王毛球[3] Jin Xiaokun;Xu Le;Yu Wenchao;Yao Kefu;Shi Jie;Wang Maoqiu(Central Iron and Steel Research Institute(CISRI),Beijing 100081,China;Tsinghua University,Beijing 100084,China)

机构地区：[1]钢铁研究总院特钢所,北京100081 [2]清华大学,北京100084 [3]钢铁研究总院,北京100081

出　　处：《稀有金属材料与工程》2020年第1期75-84,共10页Rare Metal Materials and Engineering

基　　金：National Key Research and Development Program(2016YFB0300104,2016YFB0300102,2017YFB0304802)。

摘　　要：为了研究复合(Ti,Mo)C粒子的析出行为和强化效应选取了一种含钛的Cr-Mo钢作为研究对象力对此钢分别进行880和1350℃淬火并回火。化学萃取相分析结果表明,当淬火温度为880℃时,(Ti,Mo)C粒子的尺寸主要分布在18~36,36~60,60~96 nm,这些粒子是在热轧过程中析出的。当淬火温度为1350℃时,回火过程中新析出了1~5 nm的(Ti,Mo)C粒子,这些新析出的(Ti,Mo)C粒子产生了一个明显的二次硬化平台,析出强化量约为165 MPa。新析出的(Ti,Mo)C粒子中的Ti/Mo原子比随回火温度的升高而降低并稳定在1左右。To study the precipitation behavior and strengthening effect of(Ti,Mo)C particles,Cr-Mo steel with added Ti was austenitized at 880 and 1350 oC followed by oil quenching and tempering.The chemical extraction phase analysis results show that some(Ti,Mo)C particles were found to have size distributions within the range of 18~36 nm,36~60 nm,and 60~96 nm when the steel was austenitized at 880 oC and particles were precipitated during hot rolling.When the austenitized temperature was 1350 oC,some new(Ti,Mo)C particles appeared with sizes ranging within 1~5 nm,precipitated during tempering.These(Ti,Mo)C particles demonstrated a distinct secondary hardening platform with a strengthening increment of approximately 165 MPa.The atomic ratio of Ti/Mo in the(Ti,Mo)C particles precipitated during tempering decreased to approximately 1 as the tempering temperature increased.

关 键 词：马氏体钢 回火 (Ti Mo)C 强化 

分 类 号：TG142.24[一般工业技术—材料科学与工程]