摘要
目的减小高压水射流强化中冲蚀现象对材料表面的影响。方法选择水射流喷射压力、喷射靶距和覆盖小钢珠直径为可变参数,对18CrNiMo7-6渗碳合金钢进行高压水射流强化单因素试验。运用三维表面形貌测量系统和X射线残余应力分析仪对试验后的材料进行测量分析。结果随着压力的增大,表面粗糙度增加,残余应力最大可达693 MPa,但继续增大喷射压力反而会使残余压应力减小。随着靶距的增加,表面残余应力几乎直线减小,表面粗糙度则在靶距为110 mm时达到最小值0.77μm。随着小钢珠直径的增加,表面残余压应力先增大后减小,最大值为782 MPa;表面粗糙度先变小后增大,最小值为0.76μm。结论水射流喷射压力、喷射靶距和覆盖小钢珠直径对18CrNiMo7-6钢的表面粗糙度和残余应力影响明显。同时,每个参数在不同的变化范围,对材料表面主要的影响方式不同,对材料的表面粗糙度和表面残余压应力的影响也存在着差异。
The work aims to reduce the effects of erosion phenomenon on material surface in high-pressure water jet strengthening technology.Single factor test was applied to 18CrNiMo7-6 carburizing alloy steel by selecting water jet pressure,jet target distance and covering small steel ball diameter as variable parameters.The tested materials were measured and analyzed by means of three dimensional surface morphology measurement system and X-ray residual stress analyzer.Surface roughness increased as the pressure increased,and the maximum residual stress was 693 MPa.However,residual compressive stress decreased as injection pressure further increased.With the increase of target distance,surface residual stress decreased almost linearly,the surface roughness reached the minimum value of 0.77μm at the target distance of 110 mm.As small steel ball diameter increased,the surface residual compressive stress first increased and then decreased,and the maximum value was 782 MPa;the surface roughness first decreased and then increased,and the minimum value was 0.76μm.Both surface roughness and residual stress of 18CrNiMo7-6 steel are obviously affected by water jet injection pressure,injection target distance and covering small steel ball diameter.Meanwhile,each parameter has different influence mode on material surface in different variation range,and different influence on surface roughness and residual compressive stress of materials.
作者
孙俊杰
邓重启
屈臣鸣
王文涛
SUN Jun-jie;DENG Chong-qi;QU Chen-ming;WANG Wen-tao(School of Mechanical Engineering,Zhengzhou University,Zhengzhou 450001,China)
出处
《表面技术》
EI
CAS
CSCD
北大核心
2018年第7期173-178,共6页
Surface Technology
关键词
水射流
喷射压力
喷射靶距
钢珠直径
粗糙度
残余压应力
water jet
injection pressure
jet target distance
steel ball diameter
roughness
residual compressive stress
