18CrNiMo7-6渗碳钢超声滚压工艺及疲劳性能研究  

Study on Ultrasonic Rolling Process and Fatigue Properties of 18CrNiMo7-6 Carburized Steel

作　　者：刘治华[1] 刘鸿宇 李建鹏[1,2] 张鸣文 郭鹏 周洋[1] LIU Zhihua;LIU Hongyu;LI Jianpeng;ZHANG Mingwen;GUO Peng;ZHOU Yang(School of Mechanical and Power Engineering,Zhengzhou University,Zhengzhou 450001,China;Henan Institute of Metrology,Zhengzhou 450001,China)

机构地区：[1]郑州大学机械与动力工程学院,郑州450001 [2]河南省计量测试科学研究院,郑州450001

出　　处：《组合机床与自动化加工技术》2025年第3期155-159,164,共6页Modular Machine Tool & Automatic Manufacturing Technique

基　　金：河南省自然科学基金项目(202300410431)。

摘　　要：为了探究18CrNiMo7-6渗碳钢的超声滚压工艺及超声滚压对试样疲劳性能的影响,设计了关于静压力、振幅、滚压遍数的正交试验,通过灰色关联分析对试验结果进行参数优化,得到分别针对表面残余压应力、表面硬度、表面粗糙度的单工艺目标和多工艺目标的显著性影响顺序、最优单目标和综合最优加工参数,综合最优组试样较原始试样的表面残余压应力提升了3.88倍,表面硬度提升了14.8%,表面粗糙度降低了75.7%。通过拉伸试验和旋转弯曲疲劳试验,得到综合最优参数组试验的屈服强度、抗拉强度分别为1225.4 MPa、1902.7 MPa,较原始试样提升了12.5%和7.4%,疲劳极限较原始试样提高了超过190 MPa,最优参数组在应力水平1200 MPa时疲劳寿命为714656次,疲劳性能提升明显。In order to explore the ultrasonic rolling process of 18CrNiMo7-6 carburized steel and the influence of ultrasonic rolling on the fatigue properties of the sample,orthogonal experiments on static pressure,amplitude and rolling passes are designed,and the parameters of the test results are optimized through gray correlation analysis.The sequence of significant influence of single and multiple process objectives,the optimal single objective and the comprehensive optimal processing parameters are obtained,respectively,aiming at the surface residual compressive stress,surface hardness and surface roughness.Compared with the original sample,the surface residual compressive stress of the comprehensive optimal group is increased by 3.88 times,the surface hardness is increased by 14.8%and the surface roughness is reduced by 75.7%.Through tensile test and rotary bending fatigue test,the yield strength and tensile strength of the comprehensive optimal parameter group test are 1225.4 MPa and 1902.7 MPa respectively,which are increased by 12.5%and 7.4%compared with the original sample,and the fatigue limit is increased by more than 190 MPa compared with the original sample.The fatigue life of the optimal parameter group is 714656 times at the stress level of 1200 MPa,and the fatigue performance is obviously improved.

关 键 词：18CrNiMo7-6渗碳钢 超声滚压 灰色关联分析 疲劳性能 

分 类 号：TH16[机械工程—机械制造及自动化] TG306[金属学及工艺—金属压力加工]