93W-7Ni激光粉末床熔融增材制造研究  

Laser Powder Bed Fusion Additive Manufacture of 93W-7Ni Alloy

作　　者：李俊峰[1,2] 魏正英 薛凌峰[1] Li Junfeng;Wei Zhengying;Xue Lingfeng(State Key Laboratory of Manufacturing System Engineering,Xi’an Jiaotong University,Xi’an 710049,China;Jiangsu Key Laboratory of 3D Printing Equipment and Manufacturing,Nanjing Normal University,Nanjing 210046,China)

机构地区：[1]西安交通大学机械制造系统工程国家重点实验室,陕西西安710049 [2]江苏省三维打印装备与制造重点实验室(南京师范大学),江苏南京210046

出　　处：《稀有金属材料与工程》2023年第8期2783-2790,共8页Rare Metal Materials and Engineering

基　　金：科学挑战专题(TZ2018006-0301-01);江苏省三维打印装备与制造重点实验室开放课题(3DL202101)。

摘　　要：以W颗粒和Ni颗粒预先混合的93W-7Ni粉体为原料,采用激光粉末床熔融(laser powder bed fusion,LPBF)制备了钨镍合金试样。研究了不同线能量密度的钨镍合金试样的相对密度、显微组织及显微硬度。结果表明:钨镍合金试样的缺陷主要为不规则孔隙,不存在明显可见的裂纹缺陷,且提高线能量密度能够明显减少缺陷。当线能量密度为1.5 J/mm时,钨镍合金试样相对密度达98.04%。LPBF制备的钨镍合金试样的显微组织主要由W单质相和Ni-W基体相组成,并伴有大量细小的枝/颗粒状钨晶粒。试样的显微硬度HV0.5高达5192.3 MPa,且基本不受线能量密度的影响。The W-Ni alloy specimens were prepared by laser powder bed fusion(LPBF)using 93W-7Ni pre-mixed powder feedstock.The influence of different linear energy density(LED)on relative density,microstructure and microhardness of LPBFed W-Ni alloy specimens was investigated.The results show that the defects of the W-Ni alloy specimens are mainly irregular pores with no obvious cracks and the irregular pores can be reduced by increasing the LED.The W-Ni alloy specimens with a maximum relative density of 98.04%can be prepared at the LED of 1.5 J/mm.The microstructure of LPBFed W-Ni alloy specimens is mainly composed of W particles and Ni-W matrix phase,accompanied by a large number of fine dendritic/granular W grains.The LPBFed W-Ni specimens have high microhardness HV0.5 with a maximum of 5192.3 MPa,which is not significantly influenced by LED.

关 键 词：激光粉末床熔融 钨镍合金 相对密度 显微组织 显微硬度 

分 类 号：TG146.411[一般工业技术—材料科学与工程]