激光熔融沉积TC4-IN625双金属结构梯度过渡区的组织  

Microstructures of TC4-IN625 bimetallic structure gradient transition zone prepared by laser melting deposition

作　　者：徐国建[1] 王超[1] 王辰阳 王文博 张国瑜 XU Guo-jian;WANG Chao;WANG Chen-yang;WANG Wen-bo;ZHANG Guo-yu(School of Materials Science and Engineering,Shenyang University of Technology,Shenyang 110870,China)

机构地区：[1]沈阳工业大学材料科学与工程学院,沈阳110870

出　　处：《沈阳工业大学学报》2022年第4期389-396,共8页Journal of Shenyang University of Technology

基　　金：国家重点研发计划项目(2017YFB1103600);沈阳市重大关键核心技术攻关及成果转化专项(20-202-1-10).

摘　　要：针对航天航空等领域中同一零部件不同部位需要具有不同性能的需求,在400℃预热温度条件下利用激光熔融沉积技术制备TC4-IN625双金属结构试样.结果表明:TC4区相组成为α-Ti+β-Ti,IN625区相组成为γ-Ni+Laves相;随着混合粉末中IN625含量的增加,梯度过渡区脆性金属间化合物Ti_(2)Ni、TiNi、TiNi_(3)等生成量增加.试样显微硬度先增加后降低,在40%TC4+60%IN625沉积区硬度达到最大值,且当混合粉末中IN625含量低于40%时,梯度过渡区不产生裂纹,当其含量超过60%时产生裂纹,沉积层的冷裂纹敏感性与显微硬度成正比.In order to solve the problem that aerospace and other fields have different performance requirements for different parts of the same component,TC4-IN625 bimetallic structure specimens were prepared by laser melting deposition(LMD)technique under the condition of 400℃preheating temperature.The results show that the phase composition of TC4 region isα-Ti+β-Ti,the phase composition of IN625 region isγ-Ni+Laves phase.With the increase of IN625 content in mixed powders,the amounts of Ti_(2)Ni、TiNi and TiNi_(3) brittle intermetallic compounds in gradient transition zone increase.The microhardness in gradient transition zone increases at first and then decreases,and the hardness reaches the maximum value in the 40%TC4+60%IN625 deposition area.There is no crack in the gradient transition zone when the IN625 content in mixed powders is less than 40%,but the cracking occurs when it exceeds 60%.The cold crack sensitivity of deposited layer is proportional to the microhardness.

关 键 词：激光熔融沉积 梯度过渡区 钛合金 镍基高温合金 金属间化合物 显微组织 显微硬度 冷裂纹敏感性 

分 类 号：TG457.19[金属学及工艺—焊接]