32CrNi3MoV厚壁钢管烧蚀影响层组织性能研究  

Microstructure and property of ablation affected layer of 32CrNi3MoV thick walled steel pipe

作　　者：先赫 曹京华 李政 蒋尧[1] 刘瑛[1] 付佳维 陈龙淼[2] 王经涛[1] XIAN He;CAO Jinghua;LI Zheng;JIANG Yao;LIU Ying;FU Jiawei;CHEN Longmiao;WANG Jingtao(School of Materials Science and Engineering,Nanjing University of Science and Technology,Nanjing 210094,China;School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]南京理工大学材料科学与工程学院,江苏南京210094 [2]南京理工大学机械工程学院,江苏南京210094

出　　处：《兵器材料科学与工程》2023年第2期7-11,共5页Ordnance Material Science and Engineering

基　　金：国家自然科学基金委联合基金(U2141246)。

摘　　要：通过X射线衍射(X-ray diffraction,XRD)、扫描电子显微镜(scanning electron microscope,SEM)、电子背散射衍射(electron back-scattered diffraction,EBSD)与显微硬度测试,研究32CrNi3MoV厚壁钢管烧蚀影响层组织性能演变特征。结果表明:烧蚀影响层沿半径向外可分为3层:厚度为2~3μm的奥氏体层、120μm的马氏体层及280μm的基体热影响区。3层之间有明显的平直界面。其中马氏体层又可细分为厚度为45μm的针状马氏体层和厚度为75μm的等轴马氏体层,两者间界面弯曲不明显,表现为一个过渡带。靠近奥氏体的针状马氏体层组织尺寸较大,硬度稍低;等轴状马氏体层硬度沿径向先增后减。在烧蚀影响相变层与原始基体组织间的基体受热回火软化,形成基体热影响层,其硬度沿径向逐渐增高,最终进入原始基体组织(回火索氏体)区,硬度也稳定在其平均水平。The microstructure and mechanical property evolution characteristics of ablative influence layer of 32CrNi3MoV thick walled steel pipe were studied via X-ray diffraction(XRD),scanning electron microscope(SEM),electron back-scattered diffraction(EBSD)combined with microhardness test. The results show that the ablation influence layer can be divided into three layers along the radius:2 μm-3 μm thick austenitic layer,120 μm thick martensite layer and 280 μm matrix heat affected zone. There is an obvious straight interface among three layers. The martensite layer can be subdivided into needle-shaped martensite layer with a thickness of about 45 μm and an equiaxed-shaped martensite layer with a thickness of about 75 μm. The interface between them is curved and not obvious,showing a transition zone. The needle-shaped martensite layer near the austenite has larger size and lower hardness. The hardness of equiaxed-shaped martensite layer increases firstly and then decreases along the radial direction. The matrix between the ablation influence layer and the original matrix structure is tempered and softened by heat,forming a matrix heat affected layer. Its hardness gradually increases along the radial direction,and finally enters the original matrix structure zone(tempered sorbite),and the hardness is also stabilized at its average hardness level.

关 键 词：烧蚀 32CrNi3MoV钢 显微组织 显微硬度 

分 类 号：TG142.1[一般工业技术—材料科学与工程]