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-W_(2)C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_(p)article content and laser power on the microstructure and mechanical properties of the composite were investigated.The results show that:with the increase of WC_(p)article content,the forming ability of composite samples decreases.When WC_(p)article content is(0%~15%),WC_(p)articles are evenly distributed,and no micro-pores and cracks are seen.When WC_(p)article 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 mechanism is mainly the brittle fracture of WC_(p)articles and the lamellar tearing along the WC-W_(2)C interface.
作者
吴诚福
李新意
陈洪胜
李健
聂慧慧
王文先
Wu Chengfu;Li Xinyi;Chen Hongsheng;Li Jian;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,Shanxi China;Shanxi Key Laboratory of Intelligent Underwater Equipment,Taiyuan 030024,China)
出处
《机械制造文摘（焊接分册）》
2023年第6期27-35,共9页
Welding Digest of Machinery Manufacturing
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)。
