射频等离子体球化Ti-25Ta合金粉末及其选区激光熔化成形性能研究  

Research on radio frequency plasma spheroidized Ti-25Ta powder and its fabrication by selective laser melting

作　　者：蒲芸娜 赵德伟[3] 施麒 谭冲 郑海忠[1] 刘辛 丁忠耀 Pu Yunna;Zhao Dewei;Shi Qi;Tan Chong;Zheng Haizhong;Liu Xin;Ding Zhongyao(School of Materials Science and Engineering,Nanchang Aviation University,Nanchang 330063,Jiangxi,China;Institute of New Materials,Guangdong Academy of Sciences,National Engineering Research Center of Powder Metallurgy of Titanium&Rare Metals,Guangdong Provincial Key Laboratory of Metal Toughening Technology and Application,Guangzhou 510650,Guangdong,China;Affiliated Zhongshan Hospital of Dalian University,Dalian 116001,Liaoning,China;Ximei Resources(Guangdong)Co.,Ltd.,Qingyuan513055,Guangdong,China)

机构地区：[1]南昌航空大学材料科学与工程学院,江西南昌330063 [2]广东省科学院新材料研究所,国家钛及稀有金属粉末冶金工程技术研究中心,广东省金属强韧化技术与应用重点实验室,广东广州510650 [3]大连大学附属中山医院,辽宁大连116001 [4]稀美资源(广东)有限公司,广东清远513055

出　　处：《钢铁钒钛》2022年第6期58-65,共8页Iron Steel Vanadium Titanium

基　　金：中国与乌克兰政府间科技交流项目(国科外[2021]13号);广州市重点研发计划(202206040001);清远市科技计划项目(2021DZX028)。

摘　　要：利用射频等离子体球化工艺成功制备了Ti-25Ta合金粉末,采用选区激光熔化成形Ti-25Ta合金球形粉末,研究了激光功率对打印件表面形貌、致密度、微观组织和力学性能的影响。结果显示,球化后Ti-25Ta合金粉末D50为43.8μm,较原料粒径略有增大。原料粉末内部为枝晶组织,球化后粉末内部呈胞状组织。粉末的流动性、松装密度和振实密度均有大幅提高。随着激光功率增加,α’马氏体细化明显。在较高激光功率200 W时,致密度达到最大95.32%,显微硬度(HV0.3)为378.2。拉伸试验表明,随着激光功率的增大,材料断裂机制由脆性断裂转变为脆性和韧性断裂。The Ti-25Ta alloy powder was successfully prepared by radio frequency plasma spheroidization,and the Ti-25Ta alloy spherical powder was subsequently formed by selective laser melting.The effect of laser power on the surface morphology,density,microstructure and mechanical properties was studied.The results show that the D50of the Ti-25Ta alloy powder after spheroidization is 43.8μm,which is slightly larger than that of the raw material.The interior of the raw material powder exhibits dendrite structure,while the interior of the powder after spheroidization shows a cellular structure.The flowability,bulk density and tap density of the powder are greatly improved.As the laser power increases,theα′martensite refinement is obvious.At a higher laser power of 200 W,the density reaches a maximum of 95.32%vs.solid,and the microhardness(HV0.3)is 378.2.The tensile testing shows that with the increase in laser power,the fracture mechanism of the material changes from brittle fracture to brittle-ductile fracture.

关 键 词：Ti-25Ta合金 粉末 射频等离子体球化 选区激光熔化 致密度 显微硬度 

分 类 号：TF123[冶金工程—粉末冶金] TG665[冶金工程—冶金物理化学]