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,2021,50(1):255~262.[Zhang Rong,Liu Zhongqiang,Huang Jiahao,Zhu Quanli,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.]
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
投稿时间:2020-01-06  修订日期:2020-02-17
中文关键词:  Inconel 718合金  激光选区熔化  热处理  显微组织结构  力学性能
基金项目: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)
中文摘要:
      本文主要研究了激光选区熔化成形Inconel 718合金经固溶时效(SA)、均匀化+固溶时效(H+SA)、热等静压+固溶时效(HIP+SA)三种热处理后显微组织结构的转变与力学性能之间的关系。实验结果表明,沉积态试样的晶粒内部存在大量树枝晶结构,枝晶间析出了大量硬脆Laves相。恰当的均匀化处理虽能促进δ相析出,但无γ "、γ "相,材料强度较低。热等静压(1080 ℃×1480 bar/2 h)能有效消除沉积态中的Laves相和微孔,经随后SA处理,材料的晶粒明显细化,晶界趋于平直,且强化相析出,材料的屈服强度、抗拉强度和硬度显著提高,分别达到1191 MPa、1361 MPa、490(HV0.2),断后伸长率达13.30 %,在提高材料强度的同时较大程度保留了材料的延展性,获得良好的综合力学性能。
Effect of Heat Treatment on microstructure and mechanical Properties of Inconel 718 alloy fabricated by selective laser melting
英文关键词:Inconel 718 alloy  selective laser melting  heat treatment  microstructure  mechanical properties
英文摘要:
      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%.
作者单位E-mail
张荣 华南理工大学 国家金属材料近净成形工程技术研究中心 cham1994fj@163.com 
柳中强 华南理工大学 国家金属材料近净成形工程技术研究中心  
黄嘉豪 广州昶联热等静压材料制造有限公司  
朱权利 华南理工大学 国家金属材料近净成形工程技术研究中心  
肖志瑜 华南理工大学 国家金属材料近净成形工程技术研究中心  
摘要点击次数: 62
全文下载次数: 51
查看全文  查看/发表评论  
关闭