摘要
为研究20Cr渗碳钢制高速直线导轨在不同时效处理条件下微观组织和力学性能的变化规律,采用扫描电镜(SEM)、Х射线衍射仪(XRD)和X射线应力测定仪等对时效处理前后直线导轨的微观组织、物相组成及残余应力进行分析。结果表明:经时效处理后,20Cr渗碳钢表层中马氏体组织逐渐细化并析出细小碳化物,部分残余奥氏体发生分解,使导轨表面硬度提高,最高硬度为729.3HV1/5;受残余奥氏体组织转变和铁素体含量变化的影响,导轨渗碳层残余应力得到不同程度的消除。当加热至200℃保温13 h时导轨表面残余应力消除效果最明显,残余应力值降至-127.17 MPa,消除率高达约54.05%,且残余应力与渗碳层深度存在多项式函数关系。
In order to study the effects of microstructure and mechanical properties of 20Cr carburized steel high-speed linear guide under different aging treatment conditions,the microstructure,phase composition and residual stress of linear guide before and after aging treatment were analyzed by scanning electron microscopy(SEM),Х-ray diffractometer(XRD)and X-ray stress tester.The results show that after aging treatment,the martensite structure in the surface layer of 20Cr carburized steel is gradually refined,the fine carbides is precipitated and some residual austenite decompose,the surface hardness of the guide rail increases and the maximum hardness is 729.3HV1/5.Affected by the transformation of residual austenite structure and the change of ferrite content,the residual stress of the carburized layer of the guide rail is eliminated to varying degrees.After heated to 200°C for 13 h,the residual stress relief effect on the surface of the guide rail is the most obvious,the residual stress value is reduced to-127.17 MPa and the elimination rate is as high as about 54.05%,and there is a polynomial function relationship between the residual stress and the depth of the carburized layer.
作者
王俊勃
王茜
姜凤阳
董利军
史迎建
思芳
崔刚
李超
WANG Junbo;WANG Qian;JIANG Fengyang;DONG Lijun;SHI Yingjian;SI Fang;CUI Gang;LI Chao(School of Materials Science and Engineering,Xi’an Polytechnic University,Xi’an 710048,China;Xianyang Rambler Machinery Co.Ltd.,Xianyang 712000,Shaanxi,China)
出处
《西安工程大学学报》
CAS
2023年第2期17-24,共8页
Journal of Xi’an Polytechnic University
基金
陕西省科技计划-特色产业创新链(群)攻关项目(2018TSCXL-GY-03-01)
咸阳市重大科技专项计划(2020K03-06)
咸阳市秦都区科技计划项目(2021QKJ-011)。
关键词
20Cr渗碳钢
高速直线导轨
时效处理
微观组织
残余应力
20Cr carburized steel
high-speed linear guide
aging treatment
microstructure
residual stress
作者简介
通信作者:王俊勃(1966-),男,教授,博士,研究方向为功能性复合材料的开发应用。E-mail:wangjunbo@xpu.edu.en。
