磨料水射流改性渗碳钢缺口试样研究  

Study on the notched specimen of carburized steel modified by abrasive water jet

作　　者：马泳涛[1] 张彬[1] 李春凡 王俊龙[1] 孙宁 刘兰荣[1] MA Yongtao;ZHANG Bin;LI Chunfan;WANG Junlong;SUN Ning;LIU Lanrong(College of Mechanical and Power Engineering,Zhengzhou University,Zhengzhou 450001,China)

机构地区：[1]郑州大学机械与动力工程学院,郑州450001

出　　处：《重庆理工大学学报（自然科学）》2023年第9期108-115,共8页Journal of Chongqing University of Technology：Natural Science

基　　金：国家自然科学基金项目(U1804254);河南省高等学校重点科研项目(21A460024)。

摘　　要：为了探究前混合磨料水射流系统改性渗碳钢缺口试样的变化规律及确定较优的射流工艺参数。通过自主设计的前混合磨料水射流系统对缺口圆角半径R=0.6 mm的18CrNiMo7-6渗碳合金钢疲劳试样进行改性处理,采用理论和试验相结合的方法,得到不同覆盖率下的工艺参数关系以及缺口圆角半径尺寸、残余应力、粗糙度变化情况。结果发现:随着压力的增加,残余应力场较优,但缺口根部尺寸变化较大且会产生较高的粗糙度。以残余应力、粗糙度和加工效率为评价指标综合考虑得到工件转速、喷嘴移速较合适的配比为0.48。由于冲蚀作用的影响,射流次数的增加使得近表层的残余应力值有所下降,但残余应力层深、最大残余应力值、最大应力值对应的层深都有一定的增加。Conventional contact processes such as rolling and extrusion are difficult to handle notched materials with high hardness,are not prone to plastic deformation,and are difficult to introduce residual stress.Therefore,it is necessary to seek new methods for effective modification.Pre mixed jet is a new type of surface modification technology that combines high-pressure water jet technology with shot peening.It utilizes the speed of high-pressure water flow to propel shot particles into the target material at high speed,forming multiple covered craters on the surface of the part,achieving the goal of introducing residual stress and modification.The characteristic of this process is high energy concentration,and through the combination of high pressure and high-strength pellets,the hard surface after heat treatment can be modified.In addition,this method is flexible in operation and can achieve effective modification of various spatial surfaces and narrow grooves under certain nozzle size conditions and with the cooperation of relevant motion platforms.In order to investigate the effects of different process parameters on the radius size,residual stress,and roughness of the notch in the pre mixed abrasive water jet system,the general pattern of modified notch specimens was obtained and the optimal jet process parameters were determined.A pre mixed abrasive water jet system was used to modify the fatigue specimen with a notch radius R=0.6 mm of 18CrNiMo7-6 carburized alloy steel after heat treatment.A combination of theoretical and experimental methods was used to measure and analyze the notch radius size,residual stress,and roughness of the specimen under different pressures,workpiece speed,nozzle movement speed,and jet frequency using a three-dimensional morphology analyzer and residual stress analyzer,Summarized the variation law of the notch fillet radius of the modified sample and the construction law of the residual stress field.Research has found that under a certain material,the change in narrow size caused by

关 键 词：前混合 磨料水射流 缺口圆角半径 残余应力 粗糙度 

分 类 号：TG664[金属学及工艺—金属切削加工及机床]