AZ91合金表面激光冲击强化与性能研究  

Study on Laser Impact Strengthening and Performance of AZ91 Alloy Surface

作　　者：何志静 王强[1] 邵伟 HE Zhijing;WANG Qiang;SHAO Wei(Department of Automotive Engineering,Guizhou Communication Vocational College,Guiyang 550008,China;School of Materials and Metallurgy,Guizhou University,Guiyang 550025,China)

机构地区：[1]贵州交通职业技术学院汽车工程系,贵州贵阳550008 [2]贵州大学材料与冶金学院,贵州贵阳550025

出　　处：《铸造技术》2018年第9期1897-1899,共3页Foundry Technology

摘　　要：通过对汽车发动机用AZ91合金进行表面激光冲击强化处理,对比分析了不同激光冲击能量下的表面改性层的显微组织、硬度和耐腐蚀性能。结果表明,经过表面激光冲击强化后,AZ91合金表层均形成了一定厚度的强化层,且冲击能量为6J时的表面强化层更厚;随着距离表面距离的增加,冲击能量为4J和6J的冲击强化层的显微硬度呈现逐渐降低的趋势,且在距离表面1.8mm内均高于AZ91合金基材;表面激光冲击强化层的耐腐蚀性能均高于预固溶态,且冲击激光能为6J的强化层耐腐蚀性能最佳。The surface laser impact strengthening treatment of AZ91 alloy for the automobile engine materials was carried out, the microstructure, hardness and corrosion resistance of the surface modification layer under different laser impact energy were compared and analyzed. The results show that the surface layer of AZ91 alloy has formed a certain thickness of reinforcing layer, the surface strengthening layer is thicker when the impact energy is 6 J. As the distance from the surface increases, the microhardness of the impact strengthening layer with impact energy of 4 J and 6 J gradually decreases. And within 1.8 mm from the surface, the hardness is higher than the AZ91 alloy substrate. The corrosion resistance of the surface laser impact strengthening layer is higher than that of the pre-solid solution state. Moreover, the corrosion resistance of the reinforced layer with an impact laser capacity of 6 J is the best.

关 键 词：汽车发动机 AZ91合金 激光冲击强化 腐蚀 

分 类 号：TN249[电子电信—物理电子学] TG113[金属学及工艺—物理冶金]