Cu夹层激光熔化沉积IN625/TC4双金属结构过渡区组织与性能的研究  

Study on the microstructure and properties of the transition region of IN625/TC4 bimetallic structure by laser melting deposition with Cu interlayer

作　　者：王文博 徐诺 徐国建[1] 井志成 张国瑜 赵雪 项卓 Wang Wenbo;Xu Nuo;Xu Guojian;Jing Zhicheng;Zhang Guoyu;Zhao Xue;Xiang Zhuo(School of Materials Science and Engineering,Shenyang University of Technology,Shenyang 110870,Liaoning,China;Center for Faculty Development and Educational Assessment(Institute of Higher Education),Shenyang University of Technology,Shenyang 110870,Liaoning,China)

机构地区：[1]沈阳工业大学材料科学与工程学院,辽宁沈阳110870 [2]沈阳工业大学教师发展与教育评估中心(高等教育研究所),辽宁沈阳110870

出　　处：《钢铁钒钛》2023年第4期48-54,共7页Iron Steel Vanadium Titanium

基　　金：沈阳市科技计划项目(No.20-202-1-10);广东省重点研发计划项目(No.2018B090905003)。

摘　　要：由具有优异高温性能的IN625镍基高温合金和轻质高强度的TC4钛合金构成的双金属结构在航空航天领域中具有广阔的应用前景,然而,由于两种金属的物理化学性质差异较大,直接制造IN625/TC4双金属结构时,不可避免地在过渡区形成裂纹等冶金缺陷,因此IN625/TC4双金属结构的有效连接一直是行业研究的热点与难点。采用激光熔化沉积技术,通过添加Cu夹层制备了无裂纹等冶金缺陷的IN625/TC4双金属结构,研究了其过渡区的显微组织与力学性能。结果表明,Cu夹层激光熔化沉积IN625/TC4双金属结构过渡区内部的相组成主要为:γ-Ni、γ-Cu、(Cr,Mo)、Ti2Cu、TiCu、TiNi3、α-Ti及β-Ti;室温拉伸结果表明,添加Cu夹层的IN625/TC4双金属结构的抗拉强度约为228.9 MPa,断裂位置位于Cu/IN625过渡区附近,断口形貌表现为准解理断裂特性。The bimetallic structure composed of IN625 nickel-based high-temperature alloy with excellent high-temperature properties and lightweight and high-strength TC4 titanium alloy has broad application prospects in the aerospace field.However,due to the large differences in physical and chemical properties of the two metals,the direct fabrication of IN625/TC4 bimetallic structure inevitably results in the formation of metallurgical defects such as cracks in the transition region,so the effective connection of IN625/TC4 bimetallic structure has been a hot spot and a difficult area of research in the industry.In this work,laser melting deposition technology was used to prepare IN625/TC4 bimetallic structure without cracks and other metallurgical defects by adding Cu interlayer,and studied the microstructure and mechanical properties of the transition region.The results show that the phase composition inside the transition region of the IN625/TC4 bimetallic structure deposited by laser melting with Cu interlayer is mainlyγ-Ni,γ-Cu,(Cr,Mo),Ti2Cu,TiCu,TiNi3,α-Ti andβ-Ti.Tensile results at room temperature indicate that the tensile strength of the IN625/TC4 bimetallic structure with Cu interlayer is about 228.9 MPa.The fracture location is near the Cu/IN625 transition region,and the fracture morphology shows quasi-dissociative fracture characteristics.

关 键 词：高温合金 钛合金 双金属结构 激光熔化沉积 Cu夹层 抗拉强度 

分 类 号：TF823[冶金工程—有色金属冶金] TG135[一般工业技术—材料科学与工程]