【作者】 任旭东； 张永康； 张凌峰； 周建忠；

【Author】 REN Xu-dong,ZHANG Yong-kang,ZHANG Ling-feng,ZHOU Jian-zhong (School of Mechanical Engineering, Jiangsu University,Zhenjiang 212013,China)

【机构】 江苏大学机械工程学院光子制造科学与技术省重点实验室；

【摘要】 选用不同涂层对304不锈钢板材激光冲击处理,研究自主研制的硅酸乙脂涂层与几种常用涂层对304不锈钢的硬度和表面残余应力的影响。在激光冲击过程中黑漆涂层、铝箔涂层和硅酸乙脂涂层均能有效提高冲击试样的表面硬度,激光连续冲击后,304 不锈钢表面形成0．8mm厚的硬化层,其表面硬度达到 240HV;激光脉冲功率从2．8GW／cm2提高到3． 6GW／cm2,黑漆涂层、铝箔涂层和硅酸乙脂涂层的试样表面硬度分别提高了34％、43％、65%,其表面残余应力也逐渐增大。更多还原

【Abstract】 Laser shock processing (LSP) employs high-energy laser pulses to create intense shock waves in a material, which can induce compressive residual stresses in the target and improve its fatigue life. Three different ablative, sacrificial coating such as black paint, aluminum foil and silica acid black paint are choused to protect the SUS304 metal from surface melting during laser pulse, which adversely affects surface hardness. This paper analyzes the effect of the paint and foil coatings on the shock wave propagation into the SUS304 specimen and the resulting change in mechanical properties. The depths of hardening by laser processing of SUS304 up to 0. 8mm, and the surface hardness reach 240HV. As the laser pulse energy density increase from 2. 8GW/cm2 to 3. 6GW/cm2,the surface hardness of the black paint, aluminum foil and silica acid black paint increase to 34%, 43%,65% respectively. The experimental results revealed that Silica acid black paint has a better laser shock effect than other coatings, It also offers many of the advantages of process flexibility associated with other laser manufacturing techniques.更多还原