非球形钨粉SLM成形W-Ni-Fe合金的研究  

Research on Selective Laser Melting of W-Ni-Fe Alloy Using Non-spherical Tungsten Powder

作　　者：陈逸贤 罗梦杰 李瑞迪[1] 康景涛 袁铁锤[1] CHEN Yixian;LUO Mengjie;LI Ruidi;KANG Jingtao;YUAN Tiechui(State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,Hunan,China;Xi’an Aero-Engine Corporation,Xi’an 710100,Shaanxi,China)

机构地区：[1]中南大学粉末冶金研究院,湖南长沙410083 [2]西安航天发动机有限公司,陕西西安710100

出　　处：《中国钨业》2024年第6期70-76,共7页China Tungsten Industry

基　　金：湖南省科技创新平台与人才计划(2022RC3033)。

摘　　要：激光选区熔化(SLM)成形W-Ni-Fe合金多采用球形钨粉,制备成本较高。本研究提出使用低成本非球形钨粉进行SLM打印90W-7Ni-3Fe的方案,通过优化打印策略控制成形件质量,并深入分析了非球形细钨粉对打印成形件性能的影响。研究结果表明,SLM成形90W-7Ni-3Fe的成形窗口较窄,扫描速度400 mm/s、扫描功率350 W打印的90W-7Ni-3Fe合金质量最好,缺陷和孔隙最少。SEM和EDS结果显示,成形件微观组织由粗W粒子相、近等轴细W区域和低熔点Ni-Fe相区域组成,低熔点金属(Ni/Fe)熔化形成液相,未熔融的钨粒子间隙被液相填充,近等轴细W区域部分钨溶解形成固溶体。采用合适的打印参数与策略,获得了硬度值为601.38±54.33 HV_(0.2)的非球形钨粉SLM打印90W-7Ni-3Fe合金。研究结果可为激光3D打印钨材料成形技术的选择和粉末优化提供参考。Conventional selective laser melting(SLM)of 90W-Ni-Fe alloys predominantly employs spherical tungsten powder,which incurs high preparation costs.This study proposes a low-cost approach utilizing non-spherical tungsten powder for SLM fabrication of 90W-7Ni-3Fe alloy.The printing strategy was optimized to control the quality of formed components.The effects of non-spherical fine tungsten powder on the performance of printed parts were systematically investigated.The results indicate that the process window for SLM-formed 90W-7Ni-3Fe alloy is narrow.Optimal printing quality with minimal defects and porosity was achieved at a scanning speed of 400 mm/s and laser power of 350 W.SEM and EDS analyses revealed that the microstructure of the formed alloy comprises three distinct regions:coarse W particle phases,near-equiaxed fine W regions,and low-melting-point Ni-Fe phase regions.The molten low-melting-point metals(Ni/Fe)formed a liquid phase that filled gaps between unmelted tungsten particles,while partial dissolution of tungsten in the near-equiaxed fine W regions led to solid solution formation.By employing appropriate printing parameters and strategies,a hardness value of 601.38±54.33 HV_(0.2) was achieved for the SLM-printed 90W-7Ni-3Fe alloy using non-spherical tungsten powder.These findings provide critical insights for parameter selection and powder optimization in laser 3D printing of tungsten-based materials.

关 键 词：钨高比重合金 激光选区熔化 W-NI-FE 显微结构 硬度 

分 类 号：TG113[金属学及工艺—物理冶金]