Quick Search:       Advanced Search
张荣,柳中强,黄嘉豪,朱权利,肖志瑜.热处理对激光选区熔化成形Inconel 718合金显微组织结构和力学性能的影响[J].稀有金属材料与工程(英文),2021,50(1):255~262.[Zhang Rong,Liu Zhongqiang,Huang Jiahao,Zhu Quanli and Xiao Zhiyu.Effect of Heat Treatment on microstructure and mechanical Properties of Inconel 718 alloy fabricated by selective laser melting[J].Rare Metal Materials and Engineering,2021,50(1):255~262.]
Effect of Heat Treatment on microstructure and mechanical Properties of Inconel 718 alloy fabricated by selective laser melting
Download Pdf  View/Add Comment  Download reader
Received:January 06, 2020  
DOI:
Key words: Inconel 718 alloy  selective laser melting  heat treatment  microstructure  mechanical properties
Foundation item:国家自然科学基金重大仪器专项(51627805);广东省自然科学基金团队项目(2015A030312003);广东省科技攻关项目(2014B010129003)
Author NameAffiliation
Zhang Rong,Liu Zhongqiang,Huang Jiahao,Zhu Quanli and Xiao Zhiyu  
Hits: 71
Download times: 150
Abstract:
      This paper studies for the effect of solution-aging (SA), homogenization + solution aging (H+SA), Hot isostatic pressing + solution-aging (HIP + SA) three different heat treatments on the microstructure and mechanical properties of selective laser melting (SLM) formed Inconel 718 alloy. The as-built Inconel 718 has a large number of dendritic structures, and there are many brittle Laves phase precipitating among the interdendritic region. The δ phase was prone to precipitate when treated by proper homogenization, but the material can not be strengthened without γ"and γ " phases. Hot isostatic pressing(1080 ℃×1480 bar/2 h) can considerably removed Laves phase and micro pores of the as-fabricated samples, and combine with the solution aging treatment subsequently, it’s conductive to refine the grain size of the as-built samples, flat the grain boundaries, and promote the precipitation of γ "、γ " phase, so HIP+SA treatment significantly increases the strength of Inconel 718 alloy, the mechanical properties of Inconel 718 alloy reached their optimum combination at UTS=1361 MPa, 0.2% YS=1191 Mpa, and HV0.2 =490, and the elongation after breaking is 13.30%.