激光增材制造WC_(p)钛基复合材料界面连接机理及力学性能  

Interface connection mechanism and mechanical properties of WCp titanium matrix composites fabricated by laser additive

作　　者：吴诚福 李新意 陈洪胜[1,4] 李健 聂慧慧 王文先[4] WU Chengfu;LI Xinyi;CHEN Hongsheng;LIJian;NIE Huihui;WANG Wenxian(Taiyuan University of Technology,Taiyuan 030024,China;West New Zirconium Nuclear Material Technology Co.,LTD.,Xi'an 710299,China;Huozhou Coal Power Group Xin Ju Coal Machinery Equipment Manufacturing Co.,LTD.,Linfen 041000,China;Shanxi Key Laboratory of Intelligent Underwater Equipment,Taiyuan 030024,China)

机构地区：[1]太原理工大学,太原030024 [2]西部新锆核材料科技有限公司,西安710299 [3]霍州煤电集团鑫钜煤机装备制造有限责任公司,临汾041000 [4]智能水下装备山西省重点实验室,太原030024

出　　处：《焊接学报》2023年第3期44-53,I0005,I0006,共12页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(51805358;51775366);山西省晋中市重点研发计划(Y201023);山西省自然科学基金资助项目(201901D111057);大学生创新创业训练计划项目(202010112011,20210078)。

摘　　要：颗粒增强金属基复合结构件在航空航天、机械制造以及电子电工等领域有着广泛的应有前景.文中选用激光增材选区熔化技术制备碳化钨(WC)颗粒增强TC4复合材料(WC/TC4),研究了WC颗粒含量和激光功率对复合材料微观组织和力学性能的影响.结果表明,随着WC颗粒含量的增加,复合材料宏观试样成形能力降低,在WC颗粒含量为(0%~15%)时,WC颗粒分布较为均匀,未见微气孔、裂纹的出现,当颗粒含量为20%时,材料内部出现气孔和裂纹,难以成形;在WC/基体的界面处形成了一层TiC和W_(2)C界面层,界面结合性能良好;随着复合材料内部颗粒含量和激光功率的增加,材料的断裂强度和断后伸长率降低,断裂机理主要为WC颗粒的脆性断裂和沿WC-W2C界面的层状撕裂.Particle reinforced metal matrix composite structural parts have a wide range of prospects in aerospace,mechanical manufacturing,electronic and electrical fields.This study fabricated WC-reinforced TC4 matrix composites by laser selective melting technology.The effects of WC particle content and laser power on the microstructure and mechanical properties of the composite were investigated.The results show that:with the increase of WC particle content,the forming ability of composite samples decreases.When WC particle content is(0%~15%),WC particles are evenly distributed,and no micro-pores and cracks are seen.When WC particle content is 20%,pores and cracks appear inside the material,making it difficult to form.At the interface of WC/matrix,an interface layer of TiC and W_(2)C is formed,and the interface bonding performance is good.With the increase of particle content and laser power in the composites,the fracture strength and elongation of the composites decrease.The fracture mech-anism is mainly the brittle fracture of WC particles and thelamellar tearing along the WC-W_(2)C interface.

关 键 词：激光选区熔化 WC/TC4复合材料 界面 断裂机理 

分 类 号：TG421[金属学及工艺—焊接] TG156