激光选区熔化ZrC增强铌合金的组织与性能研究  

Microstructure and Properties of ZrC Enhanced Niobium Alloys Fabricated by Selective Laser Melting

作　　者：李东来 秦孟 董鹏 武致军 周庆军 杜尚哲 冯凯[2] 李铸国[2] LI Donglai;QIN Meng;DONG Peng;WU Zhijun;ZHOU Qingjun;DU Shangzhe;FENG Kai;LI Zhuguo(Capital Aerospace Machinery Co.,Ltd.,Beijing 100076,China;Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]首都航天机械有限公司,北京100076 [2]上海交通大学,上海200240

出　　处：《航空制造技术》2024年第15期74-80,共7页Aeronautical Manufacturing Technology

基　　金：国家自然科学基金(12032002);国防科技173计划技术领域基金(B02007)。

摘　　要：铌合金在超高温环境具有优异的强度和轻量化优势,但传统加工工艺难以实现对其复杂构件的制备。本研究采用激光选区熔化技术制备了组织致密的Nb52和Nb52–0.1ZrC两种铌合金,通过引入碳化物的方法提高了铌合金的力学性能。研究表明,ZrC的引入显著提高了铌合金的强度,其打印态屈服强度、抗拉强度和塑性应变分别达745.91 MPa、795.45 MPa和1.8%,室温断裂方式为沿晶断裂和穿晶断裂混合断裂模式。本研究扩宽了铌合金的成形工艺,为改善铌合金性能和开发低成本的铌合金体系提供了新的研究思路。Niobium alloys exhibit exceptional strength and lightweight advantages in the ultra-high temperature environment.However,conventional processing techniques face challenges in fabricating intricate components.In this study,two niobium alloys,Nb52 and Nb52–0.1ZrC,with dense microstructure,were prepared by selective laser melting(SLM)technology.The results show that the introduction of ZrC carbides significantly improves the strength of SLMed niobium alloys,and its yield strength,tensile strength,and plastic strain in the as-printed state reach up to 745.91 MPa,795.45 MPa,and 1.8%,respectively.Fracture behavior at room temperature exhibits a combination of intergranular fracture and transgranular fracture modes.This work broadens the forming process of niobium alloy,and provides a new research idea for improving the properties of niobium alloys and developing a new low-cost niobium alloy system.

关 键 词：铌合金 激光选区熔化(SLM) 原位合金化 显微组织 力学性能 

分 类 号：TG146.416[一般工业技术—材料科学与工程] TG665[金属学及工艺—金属材料] V261.8[金属学及工艺—金属学]