激光工艺参数对选区激光熔化钽微观组织和力学性能的影响  

Effect of Processing Parameters on Microstructure and Mechanical Properties of Ta Prepared by Selective Laser Melting

作　　者：秦奉 申正焱 施麒 周舸 姚岛 赵宇敏 刘辛 陈立佳[1] Qin Feng;Shen Zhengyan;Shi Qi;Zhou Ge;Yao Dao;Zhao Yumin;Liu Xin;Chen Lijia(School of Materials Science and Engineering,Shenyang University of Technology,Shenyang 110870,China;Institute of New Materials,Guangdong Academy of Sciences,Guangzhou 510650,China;Guangdong Provincial Key Laboratory of Metal Toughening Technology and Application,Guangzhou 510650,China;National Engineering Research Center of Powder Metallurgy of Titanium&Rare Metals,Guangzhou 510650,China;Heyuan Institute of Guangdong Academy of Sciences,Heyuan 517000,China)

机构地区：[1]沈阳工业大学材料科学与工程学院,辽宁沈阳110870 [2]广东省科学院新材料研究所,广东广州510650 [3]广东省金属强韧化技术与应用重点实验室,广东广州510650 [4]国家钛及稀有金属粉末冶金工程技术研究中心,广东广州510650 [5]河源市省科院研究院,广东河源517000

出　　处：《稀有金属材料与工程》2023年第9期3026-3036,共11页Rare Metal Materials and Engineering

基　　金：Key Realm R&D Program of Guangdong Province(2018B090904004);Key Research Program of Guangzhou(202206040001);GDASHY Project of Science and Technology Development(2021GDASHY-0107);Science and Technology Program of Qingyuan(2021DZX028);Guangdong Academy of Science Project of Science and Technology Development(2020GDASYL-20200103142,2022GDASZH-2022010107)。

摘　　要：研究了单、双层扫描策略和能量密度(246~640 J/mm^(3))对选区激光熔化钽显微组织及力学性能的影响。采用扫描电子显微镜和电子背散射衍射对选区激光熔化钽的显微组织进行表征,并对其显微硬度和拉伸性能进行检测。结果表明,选区激光熔化钽显微组织由明显向上生长的柱状晶构成,双层扫描后的钽具有更细的晶粒尺寸。随着输入能量密度的提高,选区激光熔化钽的强度、显微硬度和塑性均具有明显的上升趋势。此外,双层扫描工艺可进一步提高材料密度,且在保留强度的基础上,增强材料塑性。在能量密度为640J/mm^(3)(双层扫描)时,金属钽性能最优,显微硬度、极限抗拉伸强度及延伸率分别为2307 MPa,527 MPa和11.4%。The effects of single-layer and double-layer scanning strategies and energy density(246–640 J/mm^(3))on the microstructures and mechanical properties of Ta prepared by selective laser melting(SLM)were investigated.The microstructure of SLM-processed Ta was characterized by scanning electron microscope and electron backscatter diffractometer.The microhardness and tensile properties were also tested.Results show that the Ta microstructure is composed of columnar crystals with obviously upward growth trend and the Ta prepared by double-layer scanning has finer grain size.With increasing the input energy density,the strength,microhardness,and ductility of the as-built Ta are significantly improved.In addition,the double-layer scanning strategy can further improve the densification of Ta specimen,and even increases the ductility without strength loss.When the energy density is 640 J/mm^(3)(double-layer scanning),the as-built Ta exhibits optimal properties:the microhardness,ultimate tensile strength,and elongation are 2307 MPa,527 MPa,and 11.4%,respectively.

关 键 词：选区激光熔化 扫描策略 力学性能 钽 

分 类 号：TG665[金属学及工艺—金属切削加工及机床] TG146.416[一般工业技术—材料科学与工程]