【摘要】 采用气压喷丸强化方法对316L不锈钢进行直径0.30 mm钢丸二次喷丸以及直径0.30 mm钢丸+直径0.045 mm陶瓷微粒子二次喷丸（第一次喷丸的A型阿尔曼试片弧高均为0.40 mm，第二次的N型阿尔曼试片弧高均为0.15 mm）处理，研究了不同二次喷丸处理后试验钢表面的微观结构和耐腐蚀性能，并与钢丸一次喷丸（A型阿尔曼试片弧高0.40 mm）和陶瓷微粒子一次喷丸（N型阿尔曼试片弧高0.15 mm）进行对比。结果表明：不同工艺二次喷丸后试验钢表面粗糙度均低于钢丸一次喷丸，但高于陶瓷微粒子一次喷丸；微粒子喷丸对钢丸一次喷丸后的表面粗糙度改善效果更优，表面粗糙度较低，为2.53μm。不同工艺二次喷丸后奥氏体相衍射峰半高宽均大于钢丸一次喷丸，钢丸+陶瓷微粒子二次喷丸后的衍射峰半高宽最大，为0.609°，表面晶粒细化程度最高。不同工艺二次喷丸后表面残余压应力均大于一次喷丸，且其标准差低于钢丸一次喷丸，但高于陶瓷微粒子一次喷丸；钢丸+陶瓷微粒子二次喷丸后表面残余压应力较高，为756 MPa，标准差较低，为7.40 MPa，残余压应力分布较均匀。不同工艺二次喷丸后试验钢在NaCl溶液中的电荷转移电阻均大于一次喷丸，钢丸+陶瓷微粒子二次喷丸后的电荷转移电阻最大，为47 289Ω，耐电化学腐蚀性能最优。钢丸+陶瓷微粒子二次喷丸后试验钢在MgCl₂溶液中应力腐蚀后的表面形貌与腐蚀前基本一致，耐应力腐蚀性能最优。更多还原

【Abstract】 316L stainless steel was subjected to dual shot peening treatments by an air pressure shot peening method,including dual shot peening with 0.30 mm diameter steel shots and dual shot peening with 0.30 mm diameter steel shots followed by 0.045 mm diameter ceramic microparticles（Almen A arc height of 0.40 mm for the first shot peening and Almen N arc height of 0.15 mm for the second for both treatments）. The microstructure and corrosion resistance of the test steel surface after different dual shot peening treatments were investigated and compared with those after single shot peening with steel shots（Almen A arc height of 0.40 mm） and single shot peening with ceramic microparticles（Almen N arc height of 0.15 mm）. The results show that after dual shot peening with different processes,the surface roughness of the test steel was lower than that after single shot peening with steel shots,but higher than that after single shot peening with ceramic microparticles. Microparticle shot peening had a better improvement effect on the surface roughness after single shot peening with steel shots,resulting in a relatively low surface roughness of 2.53 μm. The full width at half maximum of the austenite diffraction peaks after dual shot peening with different processes was greater than that after single shot peening with steel shots. The dual shot peening with steel shots followed by ceramic microparticles had the largest full width at half maximum of 0.609°, indicating the highest degree of surface grain refinement. After dual shot peening with different processes,the surface residual compressive stress of the test steel was greater than that after single shot peening,and its standard deviation was lower than that after single shot peening with steel shots but higher than that after single shot peening with ceramic microparticles. After dual shot peening with steel shots followed by ceramic microparticles, the surface residual compressive stress was relatively high,reaching 756 MPa,with a low standard deviation of 7.40 MPa,indicating a relatively uniform distribution of residual compressive stress. The charge transfer resistance in NaCl solution of the test steel subjected to different dual shot peening processes was greater than that after single shot peening. The dual shot peening with steel shots followed by ceramic microparticles exhibited the highest charge transfer resistance of 47 289 Ω,showing the optimal electrochemical corrosion resistance. The surface morphology of the test steel subjected to dual shot peening with steel shots followed by ceramic microparticles after stress corrosion in MgCl₂ solution was basically consistent with that before corrosion,indicating the optimal stress corrosion resistance.更多还原