摘要
增材制造Ti-6Al-4V钛合金构件时,易出现裂纹、表面粗糙度大等缺陷.为了解决这一问题,将应用于表面强化处理的超声滚压微锻造工艺与增材制造过程相结合,通过有限元软件模拟了激光熔丝增材制造及冷却过程,并分析了超声滚压微锻造加工对增材件表面力学性能的影响.结果表明:在经过超声滚压微锻造加工后,增材件残余应力由拉应力转变为较大的压应力,有效降低了增材件产生裂纹等缺陷的风险,同时,加工后的增材件表面等效塑性应变增大,表面显微硬度提高,且超声滚压微锻造加工对滚压头接触区域影响最大.
Defects such as cracks and high surface roughness are likely to occur in the additive manufacturing of Ti-6Al-4V titanium alloy parts.In order to solve this problem,the ultrasonic rolling micro-forging technology,which is applied in surface strengthening,is combined with the additive manufacturing process.The process of laser fuse additive manufacturing and cooling is simulated by the finite element software,and the effect of ultrasonic rolling micro-forging on the mechanical properties of the additive part surface is analyzed.The results show that the residual stress changes from tensile stress to compressive stress after ultrasonic rolling micro-forging,which effectively reduces the risk of defects such as cracks in additive parts.Meanwhile,the surface equivalent plastic strain and surface micro-hardness of the processed additive increase.In addition,ultrasonic rolling micro-forging has the greatest influence on the contact area of the rolling head.
作者
任朝晖
李竺鸿
王云贺
张梓婷
REN Zhao-hui;LI Zhu-hong;WANG Yun-he;ZHANG Zi-ting(School of Mechanical Engineering&Automation,Northeastern University,Shenyang 110819,China)
出处
《东北大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2023年第5期634-641,共8页
Journal of Northeastern University(Natural Science)
基金
国家重点研发计划项目(2017YFB1103700)。
