Zr_(58)Nb_(2.76)Cu_(15.46)Ni_(12.74)Al_(10.34)Y_(0.5)非晶合金激光焊接接头微观结构及显微硬度表征  

Microstructure and Microhardness Characterization of Zr_(58)Nb_(2.76)Cu_(15.46)Ni_(12.74)Al_(10.34)Y_(0.5) Amorphous Alloy Laser Welded Joint

作　　者：丛成明 马焰议 王海燕 张宇鹏 赵鸿金[2] 余陈 徐望辉 CONG Cheng-ming;MA Yan-yi;WANG Hai-yan;ZHANG Yu-peng;ZHAO Hong-jin;YU Chen;XU Wang-hui(China-ukraine Institute of Welding,Guangdong Academy of Sciences,Guangzhou 510651,China;Faculty of MaterialsMetallurgy and Chemistry,Jiangxi University of Science and Technology,Jiangxi Ganzhou 341000,China)

机构地区：[1]广东省科学院中乌焊接研究所,广州510651 [2]江西理工大学材料冶金化学学部,江西赣州341000

出　　处：《精密成形工程》2022年第5期109-114,共6页Journal of Netshape Forming Engineering

基　　金：广东省科学院建设国内一流研究机构行动专项(2019GDASYL‒0103075);国家重点研发计划(2020YFE0205300);广州市科技项目(201807010035,201807010011);国家自然科学基金(52005112)。

摘　　要：目的探究激光焊接参数对非晶合金焊接接头的组织演变、焊缝成形、晶化程度等的影响规律,以及控制接头晶化的有效途径。方法采用碟片激光器对Zr_(58)Nb_(2.76)Cu_(15.46)Ni_(12.74)Al_(10.34)Y_(0.5)非晶合金进行激光焊接,对比分析不同激光功率下,焊接速度对接头熔宽和晶化组织形成的影响规律,并对接头各区域微观组织特征及硬度分布进行测试分析。结果非晶合金激光焊接接头成形良好,焊缝区组织整体为非晶,存在少量纳米晶,热影响区则发生明显晶化现象。当功率为1200 W时,逐渐提升焊接速度,接头晶化率由28.9%降到13.76%,熔宽由2.04 mm收窄至1.8 mm。当功率为4500 W时,逐渐提升焊接速度,接头晶化率从9.99%下降为7.47%,焊缝晶化现象消失,熔宽从1.10 mm降到0.98 mm。结论调节关键焊接参数可实现焊缝区晶化现象的消失,使热影响区晶化程度降低。大激光功率以及高焊接速度更有利于形成熔宽小、晶化程度低的焊接接头。焊缝区硬度与母材基本保持一致,热影响区由于发生晶化,硬度最高。This paper aims to explore the effect of laser welding parameters on the microstructure evolution,weld forming and crystallization degree of amorphous alloy welded joint,and the effective way to control the crystallization of the joint.In this paper,Zr_(58)Nb_(2.76)Cu_(15.46)Ni_(12.74)Al_(10.34)Y_(0.5) amorphous alloy was welded by the disc laser beam.The effect of welding speed on the fusion width and crystallographic structure of the joint under different laser powers was compared and analyzed,and the microstructures and microhardness distributions of each region in the welded joints were tested and analyzed.The results show that the amorphous alloy laser welded joint is well-formed,the microstructure of the weld zone is amorphous with a small amount of nanocrystalline,and the heat-affected zone has obvious crystallization.When the power was 1200 W,the welding speed was gradually increased,the joint crystallization rate decreased from 28.9%to 13.76%,and the melting width narrowed from 2.04 mm to 1.8 mm.When the power was 4500 W,the welding speed was gradually increased,the joint crystallization rate decreased from 9.99%to 7.47%,the weld crystallization phenomenon disappeared,and the melting width decreased from 1.10 mm to 0.98 mm.Adjusting the key welding parameters can realize the disappearance of the crystallization phenomenon in the weld zone and reduce the degree of crystallization in the heat-affected zone.Larger laser power and higher welding speed are more conducive to obtaining the welded joints with small melting width and low crystallinity.The hardness of the weld zone is similar to that of the base material while the heat-affected zone has the highest hardness due to crystallization.

关 键 词：激光焊接 非晶合金 晶化 焊缝熔宽 硬度 

分 类 号：TG456.7[金属学及工艺—焊接]