激光选区熔化成形W-Ni-Fe合金基础工艺和组织性能研究  

Research on Technological Basis,Microstructure and Properties of W-Ni-Fe Alloy Processed by Selective Laser Melting

作　　者：欧阳安琦 魏恺文 弓建强 王益松 周嘉宜 孟丽颖 曾晓雁 OUYANG Anqi;WEI Kaiwen;GONG Jianqiang;WANG Yisong;ZHOU Jiayi;MENG Liying;ZENG Xiaoyan(Wuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology,Wuhan 430074,Hubei,China;School of Mechanical and Electrical Engineering,Wuhan University of Technology,Wuhan 430070,Hubei,China)

机构地区：[1]华中科技大学武汉光电国家研究中心,湖北武汉430074 [2]武汉理工大学机电工程学院,湖北武汉430070

出　　处：《中国钨业》2024年第6期58-69,共12页China Tungsten Industry

基　　金：国家重点研发计划项目(2022YFB3707000);武汉市知识创新专项项目(2023010201010034)。

摘　　要：激光选区熔化(Selective Laser Melting,SLM)增材制造技术可满足W-Ni-Fe合金零件的高精度、高效率制造需求。本研究以80W-14Ni-6Fe、85W-10.5Ni-4.5Fe和90W-7Ni-3Fe(质量分数,下同)三种W-Ni-Fe合金粉末为研究对象,研究了钨元素含量和SLM工艺参数对W-Ni-Fe合金成形性及冶金缺陷的影响规律,并对成形性相对较好的80W-14Ni-6Fe合金进行了显微组织观察和力学性能分析。结果表明:随着钨含量的增加,SLM成形W-Ni-Fe合金试样的致密度下降,冶金缺陷含量增加。随着激光体能量密度的增加,SLM成形W-Ni-Fe合金的致密度呈现先上升后下降的趋势。SLM成形80W-14Ni-6Fe合金的显微组织主要包括未熔化的钨颗粒、合并钨颗粒、钨枝晶、钨晶粒沉淀和Ni-Fe黏结相。SLM成形的80W-14Ni-6Fe合金极限抗拉强度为1346 MPa,最大延伸率为5.11%,强度优于激光熔化沉积和热轧制备的W-Ni-Fe合金。Selective Laser Melting(SLM),an additive manufacturing technology,enables high-precision and efficient fabrication of W-Ni-Fe alloy components.This study investigates the effects of tungsten content and SLM process parameters on the formability and metallurgical defects of three W-Ni-Fe alloy powders:80W-14Ni-6Fe,85W-10.5Ni-4.5Fe,and 90W-7Ni-3Fe(mass fractions the same below).Microstructure characterization and mechanical performance analysis were further conducted on the 80W-14Ni-6Fe alloy,which exhibited relatively superior formability.Results indicate that increasing tungsten content reduces the density of SLM-fabricated W-Ni-Fe alloys while increasing metallurgical defects.The density of SLM-processed W-Ni-Fe alloys initially rises and then declines with higher laser volumetric energy density.The microstructure of SLM-fabricated 80W-14Ni-6Fe alloy primarily comprises unmelted tungsten particles,coalesced tungsten clusters,tungsten dendrites,tungsten grain precipitates,and a Ni-Fe binder phase.The SLM-produced 80W-14Ni-6Fe alloy demonstrates an ultimate tensile strength of 1346 MPa and a maximum elongation of 5.11%,surpassing the strength of W-Ni-Fe alloys fabricated via laser melting deposition and hot rolling.

关 键 词：激光选区熔化 W-NI-FE合金 冶金缺陷 组织性能 

分 类 号：TG146.411[一般工业技术—材料科学与工程]