AZ31镁合金表面激光选区熔覆Ti-6Al-4V粉末的显微组织及界面缺陷研究  

Research on Microstructure and Interface Defects of Laser Selective Cladding Ti-6Al-4V Powders on AZ31 Magnesium Alloy Surface

作　　者：彭建财[1] 周猛兵 王世忠[1] 魏连峰[1] 黄一轩 PENG Jiancai;ZHOU Mengbing;WANG Shizhong;WEI Lianfeng;HUANG Yixuan(Institute of Nuclear Fuel Elements and Materials,China Nuclear Power Research and Design Institute,Chengdu 610200,China;School of Materials Science and Engineering,Chongqing University,Chongqing 400000,China)

机构地区：[1]中国核动力研究设计院核燃料元件及材料研究所,四川成都610200 [2]重庆大学材料科学与工程学院,重庆400000

出　　处：《热加工工艺》2021年第18期116-119,124,共5页Hot Working Technology

摘　　要：利用选择性激光熔化设备在AZ31镁合金基体上对Ti-6Al-4V粉末进行单道多层以及多道多层熔覆试验研究。通过调整激光扫描速度研究了不同激光能量密度对熔覆层显微组织的影响,并分析了熔覆层中孔洞的形成机制。结果表明,经单道多层激光熔覆形成的试样,侧面形貌为不规则"S"形,且随激光能量密度的增加,不规则"S"形熔覆试样的宽度逐渐增加。在多道多层熔覆试验中,随激光能量密度的增加,熔覆层组织的致密度先增加后减小;Ti-6Al-4V熔覆层与AZ31镁合金基板未发生明显冶金结合,但形成的锯齿状界面有利于提高熔覆层与基体镁合金的结合强度。Single pass and multi-layer cladding of Ti-6Al-4V powders on AZ31 magnesium alloy substrate were carried out by selective laser melting equipment.The influence of laser energy density on the microstructure of the cladding layer was studied by adjusting the laser scanning speed,and the formation mechanism of holes in the cladding layer was analyzed.The results show that the side morphology of the sample formed by single pass multi-layer laser cladding is irregular"s",and the width of the irregular"s"shape increases gradually with the increase of laser energy density;in the multi-channel multi-layer cladding test,with the increase of laser energy density,the density of the cladding layer first increases and then decreases;Ti-6Al-4V cladding layer and AZ31 magnesium alloy substrate are not obvious metallurgical bonding,but the serrated interface is beneficial to improve the bonding strength between the cladding layer and the matrix magnesium alloy.

关 键 词：激光 熔覆 Ti-6Al-4V粉末 

分 类 号：TG174.4[金属学及工艺—金属表面处理]