微铸锻增材制造TC4-DT合金的高温力学性能与断裂失效行为  

Elevated Temperature Mechanical Properties and Fracture Failure Behaviorof TC4-DT Alloy Deposited by Micro-Rolled Wire-arc Additive Manufacturing

作　　者：牛香力 王祖恒 高一峰 吴传栋 宋新莉[1,2] 刘静[1,2] NIU Xiangli;WANG Zuheng;GAO Yifeng;WU Chuandong;SONG Xinli;LIU Jing(State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China;Hubei Engineering Technology Center for Marine Engineering Material and Service Safety,Wuhan University of Science and Technology,Wuhan 430081,China)

机构地区：[1]武汉科技大学省部共建耐火材料与冶金国家重点实验室,湖北武汉430081 [2]武汉科技大学湖北省海洋工程材料及服役安全工程技术中心,湖北武汉430081

出　　处：《热加工工艺》2024年第20期100-105,共6页Hot Working Technology

基　　金：湖北省重大专项项目(2022BEC025)。

摘　　要：研究了微铸锻增材制造TC4-DT合金的高温力学性能与断裂失效行为。通过X射线衍射、光学显微镜和扫描电子显微镜观察了微铸锻增材制造TC4-DT合金在平行沉积扫描方向与平行沉积增高方向的相组成与显微结构,测试了不同温度(500、600和700℃)TC4-DT合金的高温力学性能,观察了不同测试温度的拉伸断口形貌并分析了其断裂失效行为。结果表明:微铸锻增材制造TC4-DT合金主要物相为α相,平行和垂直于沉积方向的显微结构主要是网篮状组织和片层α组织,未观察到明显的各向异性。随温度升高,TC4-DT合金的强度降低,断裂行为由穿晶断裂向沿晶断裂转变。材料失效行为的主要影响因素包括高温下晶粒的长大、晶界的软化、气孔的长大与聚集。The elevated temperature mechanical properties and fracture failure behavior of TC4-DT alloy deposited by micro-rolled wire-arc additive manufacturing were investigated.The phase composition and microstructure of TC4-DT alloy was observed in the direction of parallel and perpendicular to the deposition direction based on X-ray diffraction,Optical Microscope and Scanning Electron Microscope.The elevated temperature mechanical properties of TC4-DT alloys at different temperatures(500℃,600℃and 700℃)were tested,and the tensile morphologies of the tensile fracture at different test temperatures were observed and the fracture failure behavior was analyzed.The results show that the main phase isαphase,the microstructure of TC4-DT alloy parallel and perpendicular to the deposition direction is basket-weave andαlamellar,suggesting no obvious anisotropy.As the temperature increases,the strength of TC4-DT alloy decreases,the fracture behavior is transformed from intergranular to transgranular at elevated temperature.The predominant factors affecting material fracture behavior include grain growth,softening of grain boundaries,growth and aggregation of pores at elevated temperatures.

关 键 词：TC4-DT合金 增材制造 高温力学性能 断裂失效行为 

分 类 号：TG146.23[一般工业技术—材料科学与工程]