激光熔覆TF550阻燃钛合金的组织和性能研究  

Research on Microstructure and Properties of Laser Cladded TF550 Burn Resistant Titanium Alloy

作　　者：王晓东 陈嘉鑫 彭俊超 刘丰刚 刘奋成[2] 胡万谦 王联波 WANGXiaodong;CHENJiaxin;PENGJunchao;LIUFenggang;LIUFencheng;HUWanqian;WANGLianbo(Aero Engine Corporation of China,Beijing 100097,China;School of Aeronautical Manufacturing Engineering,Nanchang Hangkong University,Nanchang 330063,China;Jiangxi Baohang New Material Co.,Ltd.,Nanchang 330200,China)

机构地区：[1]中国航空发动机集团有限公司,北京100097 [2]南昌航空大学航空制造工程学院,江西南昌330063 [3]江西宝航新材料有限公司,江西南昌330200

出　　处：《热加工工艺》2024年第14期161-167,共7页Hot Working Technology

基　　金：国家自然科学基金资助项目(52165050,52265053);轻合金加工科学与技术国防重点学科实验室开放基金资助项目(EG201903448);无损检测技术教育部重点实验室开放基金资助项目(EW202203364)。

摘　　要：研究了工艺参数对激光熔覆TF550阻燃钛合金成形质量的影响,以及微观组织和力学性能演变规律。结果表明,对试样成形的影响因素主次为激光功率>扫描速度>送粉率。不同激光功率下的激光熔覆TF550阻燃钛合金块体试样顶部及底部均由等轴Prior-β晶粒组成,中间区域为粗大的柱状Prior-β晶粒。随着激光功率的增大,各区域的晶粒尺寸也随之增大。激光熔覆TF550阻燃钛合金试样的显微组织主要由鸡爪状的TiC相、点状的Ti_(5)Si_(3)以及针状的α组成。激光熔覆TF550试样的平均显微硬度均呈现出沉积区>热影响区>基材的规律。激光熔覆TF550试样水平方向的抗拉强度以及屈服强度均略高于锻件,但伸长率仅为锻件的72%,其断口形貌呈现出混合断裂的特征。The effect of process parameters on the forming quality of laser cladded TF550 burn resistant titanium alloy and the evolution of microstructure and mechanical properties were studied.The results show that the influencing factors on sample forming are laser power>scanning speed>powder feeding rate.The top and bottom of the laser cladded TF550 titanium alloy block samples at different laser power are composed of equiaxial prior-β grains,and the middle region is a coarse columnar prior-β grains.With the increase of laser power,the grain size of each region also increases.The microstructure of laser cladded TF550 titanium alloy samples is mainly composed of chicken claw shape TiC phase,point-like Ti_(5)Si_(3) and acicularα.The average microhardness of the laser cladded TF550 samples shows a pattern of deposition zone>heat affected zone>substrate.The horizontal tensile strength and yield strength of the laser cladded TF550 samples are slightly higher than that of the forgings,but the elongation is only 72% of that of the forgings,and the fracture morphology shows the characteristics of mixed fracture.

关 键 词：激光熔覆 TF550阻燃钛合金 工艺参数 微观组织 拉伸性能 

分 类 号：TG146.23[一般工业技术—材料科学与工程]