40Cr钢等温淬火形成的下贝氏体组织形貌特征  

Morphology characteristics of lower bainite of 40Cr steel under isothermal quenching

作　　者：陈洁明 李雪峰[1,2] 王刚 潘恒沛 张先锋 CHEN Jieming;LI Xuefeng;WANG Gang;PAN Hengpei;ZHANG Xianfeng(Luoyang Ship Material Research Institute,Luoyang 471023,China;Henan Key Laboratory of Technology and Application of Structural Materials for Ships and Marine Equipments,Luoyang 471023,China;Luoyang Shuangrui Wanji Titanium Industry Co.,Ltd.,Luoyang 471000,China)

机构地区：[1]中国船舶重工集团公司第七二五研究所,洛阳471023 [2]河南省船舶及海工装备结构材料技术与应用重点实验室,洛阳471023 [3]洛阳双瑞万基钛业有限公司,洛阳471000

出　　处：《理化检验（物理分册）》2022年第11期6-10,共5页Physical Testing and Chemical Analysis(Part A:Physical Testing)

摘　　要：利用光学显微镜、扫描电镜、电子背散射衍射及透射电镜观察了40Cr钢等温淬火形成的下贝氏体组织形貌,并分析了下贝氏体与马氏体、回火索氏体的差异。结果表明:下贝氏体组织形貌与马氏体、回火索氏体均有明显差异,且下贝氏体的硬度高于回火索氏体;下贝氏体针状组织密集排列成束,方向感强,侵蚀后呈彩色,组织内部细密的碳化物沉淀在铁素体板条上,碳化物排列整齐,且与铁素体长轴夹角呈60°。The morphology of lower bainite formed by isothermal quenching of 40 Cr steel was observed by optical microscope, scanning electron microscope, electron backscatter diffraction and transmission electron microscope, and the differences with martensite and tempered sorbite were analyzed. The results show that the morphology of lower bainite was obviously different from that of martensite and tempered sorbite, and the hardness of lower bainite was higher than that of tempered sorbate. The needle like structure of lower bainite was densely arranged in bundles, with strong sense of direction and color after erosion. The inside of the structure was fine carbide precipitated on the ferrite lath. The carbides were arranged in order, and the included angle with the long axis of ferrite was 60°.

关 键 词：40CR钢 等温淬火 下贝氏体 碳化物 

分 类 号：TB31[一般工业技术—材料科学与工程] TG115.12[金属学及工艺—物理冶金]