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采用扫描电镜、X射线衍射仪研究喷丸形变处理工艺对S30432钢表面残余压应力分布与组织结构变化的影响,分析了不同喷丸工艺下表面残余应力的分布特征。结果表明,采用钢丸与陶瓷丸复合喷丸工艺,材料表面残余压应力约为-520 MPa,而最大残余应力值在距表面大约0.02 mm处,其值约为-550 MPa;采用单一钢丸的喷丸工艺,表面残余压应力约为-400 MPa,距表面大约0.06 mm处残余压应力达到最大值,约为-500 MPa。喷丸后在形变层形成许多位错墙并将组织分割为细小的位错胞。
The influence of the shot peening deformation process on the residual compressive stress distribution and the microstructure of the S30432 steel was studied by scanning electron microscopy and X-ray diffraction. The distribution characteristics of surface residual stress under different shot peening techniques were analyzed. The results show that the residual compressive stress on the surface of the material is about -520 MPa and the maximum residual stress is about -550 MPa at the surface of about 0.02 mm from the steel shot and ceramic pellet shot peening process. Of the shot peening process, the surface residual compressive stress of about -400 MPa, about 0.06 mm from the surface surface of the residual compressive stress maximum, about -500 MPa. After shot peening, many dislocation walls are formed in the deformed layer and the tissue is divided into fine dislocation cells.