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张群莉,张杰,李栋,童文华,Liu Rong,宋立军,姚建华.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[J].稀有金属材料与工程(英文),2020,49(5):1785~1792.[Zhang Qunli,Zhang Jie,Li Dong,Tong Wenhua,Rong Liu,Song Lijun and Yao Jianhua.Microstructure and Properties of Laser Additive Remanufactured IN718 Alloy Treated with Different Aging Temperatures[J].Rare Metal Materials and Engineering,2020,49(5):1785~1792.]
Microstructure and Properties of Laser Additive Remanufactured IN718 Alloy Treated with Different Aging Temperatures
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Received:October 18, 2019  Revised:December 29, 2019
DOI:
Key words: aging treatment  laser additive remanufacturing  IN718  microsturcture  tensile property
Foundation item: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)
Author NameAffiliation
Zhang Qunli,Zhang Jie,Li Dong,Tong Wenhua,Rong Liu,Song Lijun and Yao Jianhua  
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Abstract:
      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 can not 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 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 is 410 HV0.2 at 720 ℃ for 16 h, 385 HV0.2 and 361 HV0.2 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 MPa, 1090 MPa and 1026 MPa, respectively.