K4169合金激光增材修复组织调控及拉伸性能研究  

Heat Treatment Microstructure and Tensile Properties of Laser Additive Repaired K4169 Alloy

作　　者：陈志镔 刘奋成 刘丰刚 程诗翔 汤洛天 王宏 魏宏 CHEN Zhibin;LIU Fencheng;LIU Fenggang;CHENG Shixiang;TANG Luotian;WANG Hong;WEI Hong(National Defence Key Discipline Laboratory of Light Alloy Processing Science and Technology,Nanchang Hangkong University,Nanchang 330063,China;Engineering Training Center,Nanchang Hangkong University,Nanchang 330063,China)

机构地区：[1]南昌航空大学轻合金加工科学与技术国防重点学科实验室,江西南昌330063 [2]南昌航空大学工程训练中心,江西南昌330063

出　　处：《热加工工艺》2024年第5期13-17,23,共6页Hot Working Technology

基　　金：国家自然科学基金资助项目(52361010);江西省研究生创新专项资金项目(YC2022-S723)。

摘　　要：采用激光增材修复方法对K4169合金基材进行了高质量修复,研究了均匀化处理+固溶处理+双级时效处理(SIDA)对激光增材修复K4169合金显微组织与力学性能的影响规律。研究表明:激光增材修复K4169合金修复情况良好,渗透探伤与X射线探伤均未检测到缺陷产生。试样修复区显微组织为沿沉积方向外延生长的典型的粗大柱状晶组织,细小松针状的Laves相在枝晶间大量析出。经过SIDA热处理后,贯通各个修复层的亚稳柱状枝晶组织转变为细小的等轴晶,脆性Laves相发生固溶,呈现出碎化现象。修复态试样平均抗拉强度为521 MPa,经SIDA处理后可达856 MPa,高于铸件的825 MPa,伸长率由修复态的31.4%下降到20.3%,但仍高于铸件的5%。所有室温拉伸试样断裂位置均在热影响区并且均为韧性断裂。The high quality repair of K4169 alloy substrate was carried out by using laser additive repair.The effects of homogenization treatment+solution treatment+two-stage aging treatment(SIDA)on the microstructure and tensile properties of the laser additive repaired K4169 alloy were studied.The research shows that the repair morphology of the laser additive repaired K4169 alloy is good,and no defects are detected by penetration testing and X-ray testing.The repaired microstructure is a typical coarse columnar dendrite epitaxially grown along the deposition direction,and a large number of fine needle-like Laves phases precipitate between dendrites.After SIDA heat treatment,the stable columnar dendrite structure through each repair layer is transformed into fine equiaxed grains,the brittle phase Laves phase is obviously melted,showing fragmentation.The average tensile strength of the repaired sample is 521 MPa,which reaches 856 MPa after SIDA treatment,which is higher than 825 MPa of the casting,but the elongation decreases from 31.4%of the repair state to 20.3%,which is still higher than 5%of the casting.The fracture positions of all tensile specimens at room temperature are in the heat affected zone and they are ductile fracture.

关 键 词：K4169合金 激光增材修复 显微组织 热处理 

分 类 号：TG166.7[金属学及工艺—热处理] TG456.7[金属学及工艺—金属学]