冷处理对高碳铬马氏体钢9Cr18Mo组织转变及析出行为的影响  

Effect of cryogenic treatment on microstructural evolution and precipitation of behavior of high carbon chromium martensitic steel 9Cr18Mo

作　　者：骈利平 周健[2] 李才巨[1] 马党参[2] 林鹏 迟宏宵[2] PIAN Liping;ZHOU Jian;LI Caiju;MA Dangshen;LIN Peng;CHI Hongxiao(Faculty of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,Yunnan,China;Special Steel Research Institute,Central Iron and Steel Research Institute Co.,Ltd.,Beijing 100081,China;Hebei Institute of Machinery and Electricity,Xingtai 054000,Hebei,China)

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093 [2]钢铁研究总院有限公司特殊钢研究院,北京100081 [3]河北机电职业技术学院,河北邢台054000

出　　处：《钢铁研究学报》2023年第10期1291-1299,共9页Journal of Iron and Steel Research

基　　金：云南省重大科技专项资助项目(202202AG050004);云南省中青年学术和技术带头人后备人才项目(202005AC160039)。

摘　　要：采用X射线衍射仪(XRD)、透射电子显微镜(TEM)和扫描电子显微镜-能量色散X射线光谱仪(SEM-EDS)等分析技术,研究了冷处理过程显微组织的转变和冷处理对回火过程碳化物析出行为的影响。结果表明:9Cr18Mo钢经冷处理后残余奥氏体含量降低,硬度升高;冷处理过程马氏体板条细化、大角度晶界比例和位错密度增加;碳原子在冷处理过程偏聚形成富碳区域或形成细小碳化物析出;在回火过程中,碳原子与合金原子形成大量合金碳化物析出;经过冷处理后,碳化物在回火过程中开始析出温度降低,引起了二次硬化峰偏移。The transformation of the microstructure during cryogenic treatment and the effect of cryogenic treatment on the carbide precipitation behavior during tempering were investigated by means of X-ray diffractometer(XRD),transmission electron microscope(TEM)and scanning electron microscopy(SEM-EDS).The results show that the retained austenite content decreases and the hardness increases of 9Cr18Mo steel after cryogenic treatment;the martensite lath taper,and the proportion of large-angle grain boundaries and dislocation density increase during cryogenic treatment;carbon atoms will segregate to form carbon-rich regions or form fine carbide precipitation during cryogenic treatment;carbon atoms and alloy atoms form a large amount of alloy carbide precipitation during tempering;the precipitation temperature of carbides decreases during tempering after cryogenic treatment,which causes movement of secondary hardening peak.

关 键 词：高碳铬马氏体钢9Cr18Mo 冷处理 马氏体转变 碳化物析出 二次硬化 

分 类 号：TG142.24[一般工业技术—材料科学与工程] TG156.91[金属学及工艺—金属材料]