不同时效温度下激光增材再制造IN718合金层的组织与性能研究  

Microstructure and Properties of Laser Additive Remanufactured IN718 Alloy with Different Aging Temperatures

作　　者：张群莉 张杰 李栋 童文华 Liu Rong 宋立军[4] 姚建华 Zhang Qunli;Zhang Jie;Li Dong;Tong Wenhua;Liu Rong;Song Lijun;Yao Jianhua(Institute of Laser Advanced Manufacturing,Zhejiang University of Technology,Hangzhou 310023,China;Collaborative Innovation Center of High-end Laser Manufacturing Equipment,Hangzhou 310023,China;Department of Mechanical and Aerospace Engineering,Carleton University,Ottawa Ontario,KIS 5B6,Canada;School of Mechanical and Vehicle Engineering,Hunan University,Changsha 410082,China)

机构地区：[1]浙江工业大学激光先进制造研究院,浙江杭州310023 [2]高端激光制造装备省部共建协同创新中心,浙江杭州310023 [3]卡尔顿大学机械与航空航天工程系,加拿大渥太华KIS 5B6 [4]湖南大学机械与运载工程学院,湖南长沙410082

出　　处：《稀有金属材料与工程》2020年第5期1785-1792,共8页Rare Metal Materials and Engineering

基　　金：国家重点研发计划项目(2017YFB1103600);浙江省重点研发计划联合技术研发与示范推广项目(2019C04004);省属高校基本科研业务费项目(RF-C2019003)。

摘　　要：研究了不同时效处理对激光增材再制造IN718合金组织及性能的影响。结果表明,时效处理不能改变激光增材再制造IN718合金的外延生长组织特征,但在微观上能够影响Laves在枝晶间的含量和形态。在不同时效温度条件下,随着时效时间的增加,γ"相逐渐长大并在保温一定时间后发生γ"相到δ相的转变,且时效温度越高,所需时间越短。此外,不同时效温度下处理后的修复区显微硬度和抗拉强度随时间均表现出先增后减的趋势。720℃条件下,显微硬度(HV0.2)在时效16 h时出现峰值4100 MPa,而760和800℃条件下时效4 h时出现峰值,分别为3850和3610 MPa。720,760及800℃时效条件下不同时效时间对应的抗拉强度最大值分别为1153,1090和1026 MPa。The effects of aging treatment on the microstructure and properties of laser additive remanufactured IN718 alloy were studied. The results show that the aging treatment cannot change the epitaxy growth structure of laser additive remanufactured IN718 alloy, but it will affect the content and morphology of Laves phase. With increase of the aging time, γ" phase gradually grows up and changes to δ after holding for a certain time at different aging temperatures. The higher the aging temperature, the shorter the time required. In addition, the microhardness and tensile strength of the repaired zone increase firstly and then decrease with holding time at different aging temperatures. The peak value of microhardness(HV0.2) is 4100 MPa at 720℃ for 16 h, 3850 MPa and 3610 MPa at 760 and 800℃ for 4 h, respectively. The maximum values of tensile strength corresponding to different aging time at 720, 760 and 800℃ are 1153, 1090 and 1026 MPa, respectively.

关 键 词：时效处理 激光增材再制造 IN718 组织 力学性能 

分 类 号：TG146.15[一般工业技术—材料科学与工程]