摘要
对渗碳G13Cr4Mo4Ni4V钢进行渗氮热处理,研究渗氮时间对G13Cr4Mo4Ni4V钢复合层、渗碳层和心部的微观组织变化,以及硬度的影响。结果表明:渗氮处理后的G13Cr4Mo4Ni4V钢复合层和渗碳层由碳化物、回火马氏体和少量残余奥氏体组成,心部由板条马氏体及少量碳化物组成。渗氮90 h后G13Cr4Mo4Ni4V钢表面洛氏硬度提高,但波动性增大。渗氮50 h后的G13Cr4Mo4Ni4V钢渗层显微硬度最大,可达960 HV,渗氮层厚度为0.17 mm,有效渗碳层厚度为1.67 mm;而渗氮90 h后的G13钢显微硬度最大可达到906 HV,渗氮层厚度为0.19 mm,有效渗碳层厚度为1.26 mm。有效渗碳层厚度的降低与渗氮过程中碳元素向内扩散导致基体碳浓度降低有关,而显微硬度的降低与网状碳化物的析出降低了基体碳元素含量有关。
The nitriding heat treatment of carburized G13Cr4Mo4Ni4V steel was carried,the effect of nitriding time on the microstructure of the composite layer,carburized layer and core of the steel,as well as the hardness,was studied.Results show that the composite layer and carburized layer of G13Cr4Mo4Ni4V steel after nitriding are composed of carbides,tempered martensite and a small amount of retained austenite,and the core region is composed of lath martensite and a small amount of carbides.After nitriding for 90 h,the Rockwell hardness of the steel surface increases,but the fluctuation also increases.The microhardness of the steel after nitriding for 50 h can reach 960 HV,the thickness of the nitriding layer is 0.17 mm,and the thickness of the effective carburized layer is 1.67 mm.The microhardness of the steel after nitriding for 90 h can reach 906 HV.The thickness of the nitriding layer is 0.19 mm,and the thickness of the effective carburized layer is 1.26 mm.The decrease in the thickness of the effective carburized layer is related to the inward diffusion of the carbon element and the resultant low carbon content in the matrix during the nitriding process,and the decrease in microhardness is related to the precipitation of network carbides which reduces the carbon content of the matrix.
作者
刘璐
杨晓峰
王帅
于兴福
LIU Lu;YANG Xiaofeng;WANG Shuai;YU Xingfu(AECC Harbin Bearing Co.,Ltd.,Harbin 150500,China;The First Military Representative Office of Air Force Equipment Department in Harbin,Harbin 150060,China;School of Mechanical and Power Engineering,Shenyang University of Chemical Technology,Shenyang 110142,China;School of Mechanical Engineering,Shenyang University of Technology,Shenyang 110870,China)
出处
《热加工工艺》
北大核心
2024年第16期65-68,共4页
Hot Working Technology
基金
辽宁省教育厅项目(LJ2019014)。
