有限元模拟再喷丸参数对Q345B钢残余应力演变规律的影响  

Finite Element Simulation of Influence of Re-shot Peening Parameters on Residual Stress Evolution of Q345B Steel

作　　者：张晋晗 刘华兵 甘进[1] 贾青青 杨波[3] 汪舟[4] ZHANG Jinhan;LIU Huabing;GAN Jin;JIA Qingqing;YANG Bo;WANG Zhou(School of Naval Architecture,Ocean and Energy Power Engineering,Wuhan University of Technology,Wuhan 430063,China;Green and Smart River-Sea-Going Ship,Cruise and Yacht Research Center,Wuhan University of Technology,Wuhan 430063,China;School of Transportation and Logistics Engineering,Wuhan University of Technology,Wuhan 430063,China;School of Automotive Engineering,Wuhan University of Technology,Wuhan 430063,China)

机构地区：[1]武汉理工大学船海与能源动力工程学院,武汉430063 [2]武汉理工大学绿色智能江海直达船舶与邮轮游艇研究中心,武汉430063 [3]武汉理工大学交通与物流工程学院,武汉430063 [4]武汉理工大学汽车工程学院,武汉430063

出　　处：《机械工程材料》2024年第8期83-89,共7页Materials For Mechanical Engineering

基　　金：国家自然科学基金面上项目(52371335);湖北省自然科学基金青年项目(20231j0222)。

摘　　要：对退火态Q345B钢依次进行喷丸、预疲劳、再喷丸处理,采用X射线/剥层法研究了再喷丸对残余应力和疲劳寿命的影响,以预疲劳的残余应力为初始应力,构建了随机弹丸再喷丸有限元模型,研究了覆盖率(100%,200%,300%)、弹丸直径(0.4,0.5,0.6,0.7mm)和弹丸初速度(25,35,40,45m·s^(-1))对残余应力分布及其影响层深度和试样表面粗糙度的影响。结果表明:再喷丸处理可以使预疲劳处理松弛的残余应力基本恢复到单次喷丸后的水平,并进一步延长其疲劳寿命。有限元模拟得到,随着覆盖率增加,再喷丸引入的残余压应力和影响层深度无明显变化,试样表面粗糙度增大;随着弹丸直径和弹丸初速度增加,残余压应力和影响层深度均先增大后趋于稳定,表面粗糙度增大。最优再喷丸参数为弹丸初速度40m·s^(-1),弹丸直径0.6mm,覆盖率100%。Shot peening,pre-fatigue and re-shot peenting were conducted on annealed Q345B steel in turn,and the effect of re-shot peening on the residual stress and fatigue life was studied by X-ray/stripping method.With the residual stress after pre-fatigue as the initial stress,the random projectile re-shot peening finite element model was constructed.The influence of coverage rates(100%,200%,300%),the projectile diameters(0.4,0.5,0.6,0.7 mm)and projectile initial velocities(25,35,40,45 m·s^(−1))on the residual stress distribution and the affected layer depth and the surface roughness of the sample were studied.The results show that re-shot peening could restore the residual stress relaxed by pre-fatigue treatment to the level after single shot peening,and further prolong the fatigue life.The simulation results show that with the increase of coverage rate,the residual compressive stress and the affected layer depth had no obvious change,and the surface roughness of the sample increased.With the increase of projectile diameter and initial velocity,the residual compressive stress and the affected layer depth both increased first and then became stable,and the surface roughness increased.The optimal shot peening parameters were as follows:the projectile initial velocity of 40 m·s^(−1),the projectile diameter of 0.6 mm and the coverage rate of 100%.At this time,the residual compressive stress and the affected layer depth of the re-shot peening sample were large,and the surface roughness was small,and the comprehensive reinforcement effect was the best.

关 键 词：再喷丸 有限元分析 残余应力 表面粗糙度 疲劳性能 

分 类 号：TG668[金属学及工艺—金属切削加工及机床]