Effect of heat treatment on microstructure and precipitate evolution of IN718 alloy prepared by laser additive manufacturing

doi:10.13251/j.issn.0254-6051.2023.02.028

Abstract

Abstract: Evolution of microstructure and precipitates of the IN718 alloy after heat treatments was investigated by using solid solution+double aging(SA), homogenization+double aging(HA), homogenization+solid solution+double aging(HAS), respectively. The results show that the microstructure in the as-deposited specimen is a columnar crystal microstructure and runs through multiple sedimentary layers. Recrystallization occurs after SA heat treatment. Recrystallization is significantly improved after heat treatment of HA and HSA. Heat treatment can promote the progressive transformation of columnar crystals into equiaxed crystals. There are γ matrix, Laves segregation phase and some carbides in the as-deposited specimen. After SA heat treatment, most of the Laves segregation phase is dissolved, and a large number of acicular δ phases precipitate between the grain boundaries, the crystals, and the dendrites, and some carbides remain. After HSA heat treatment, the Laves segregation phase is completely dissolved, and some δ phase precipitate at the grain boundary, and a small amount of carbides retain. There is no γ′ and γ″ phase precipitated in the as-deposited specimen, and a large number of γ′ and γ″ phases precipitate in the three heat treatment states.

Key words: laser additive manufacturing, IN718 superalloy, heat treatment, precipitates

CLC Number:

TG156

Cao Yu, Bai Pucun, Wei Anni, Liu Fei, Hou Xiaohu. Effect of heat treatment on microstructure and precipitate evolution of IN718 alloy prepared by laser additive manufacturing[J]. Heat Treatment of Metals, 2023, 48(2): 180-188.

References

[1]袁战伟, 常逢春, 马瑞, 等. 增材制造镍基高温合金研究进展[J]. 材料导报, 2022, 36(3): 206-214.
Yuan Zhanwei, Chang Fengchun, Ma Rui, et al. Researchprogress in additive manufacturing of nickel base superalloys[J]. Materials Reports, 2022, 36(3): 206-214.
[2]叶福兴, 王永辉, 娄智. 激光增材制造过程中激光与粉末的相互作用研究现状[J]. 中国表面工程, 2021, 34(2): 1-12.
Ye Fuxing, Wang Yonghui, Lou Zhi. Research of Laser Powder Interaction in Laser Additive Manufacturing[J]. China Surface Engineering, 2021, 34(2): 1-12.
[3]黄卫东. 材料3D打印技术的研究进展[J]. 新型工业化, 2016, 6(3): 53-70.
Huang Weidong. Research progress of 3D printing technology for materials[J]. The Journal of New Industrialization, 2016, 6(3): 53-70.
[4]罗浩, 何鹏江, 潘超梅, 等. 热处理对选区激光熔化In718合金微观组织及拉伸性能的影响[J]. 热加工工艺, 2021, 50(14): 131-134.
Luo Hao, He Pengjiang, Pan Chaomei, et al. Effect of heat treatment on microstructure and tensile properties of In718 alloy melted by selective laser[J]. Hot Working Technology, 2021, 50(14): 131-134.
[5]Blackwell P L. The mechanical and microstructural characteristics of laser-deposited IN718[J]. Journal of Materials Processing Technology, 2005, 170(1-2): 240-246.
[6]林鑫, 杨海欧, 陈静, 等. 激光快速成形过程中316L不锈钢显微组织的演变[J]. 金属学报, 2006, 42(4): 361-368.
Lin Xin, Yang Haiou, Chen Jing, et al. Microstructure evolution of 316L stainless steel during laser rapid prototyping[J]. Acta Metallurgica Sinica, 2006, 42(4): 361-368.
[7]Zhao X, Jing C, Xin L, et al. Study on microstructure and mechanical properties of laser rapid forming Inconel 718[J]. Materials Science and Engineering A, 2008, 478(1): 119-124.
[8]Wang Z, Guan K, Gao M, et al. The microstructure and mechanical properties of deposited-IN718 by selective laser melting[J]. Journal of Alloys and Compounds, 2012, 513(5): 518-523.
[9]宋宜四, 高万夫, 王超, 等. 热处理工艺对Inconel 718合金组织、力学性能及耐蚀性能的影响[J]. 材料工程, 2012, 37(6): 37-42.
Song Yisi, Gao Wanfu, Wang Chao, et al. Effect of heat treatment process on microstructure, mechanical properties and corrosion resistance of Inconel 718 alloy[J]. Material Engineering, 2012, 37(6): 37-42.
[10]宋衎, 喻凯, 林鑫, 等. 热处理态激光立体成形Inconel 718高温合金的组织及力学性能[J]. 金属学报, 2015, 51(8): 935-942.
Song Yu, Yu Kai, Lin Xin, et al. Microstructure and mechanical properties of Inconel 718 superalloy prepared by laser stereoforming in heat treatment state[J]. Acta Metallurgica Sinica, 2015, 51(8): 935-942.
[11]Cao Yu, Bai Pucun Liu Fei, et al. (2020) Grain growth in IN718 superalloy fabricated by laser additive manufacturing[J]. Materials Science and Technology, 2020, 36(6): 65-769.[12]Dinda G P, Dasgupta A K, Mazumder J. Texture control during laser deposition of nickel-based superalloy[J]. Scripta Materialia, 2012, 67(5): 503-506.
[13]Liu Fencheng, Yu Xiaobin, Huang Chunping, et al. Microstructure and mechanical properties of AerMet 100 ultra-high strength steel joints by laser welding[J]. Journal of Wuhan University of Technology(Materials Science Edition), 2015, 30(4): 827-830.
[14]刘奋成, 胡文伟, 贾炅昱, 等. 高致密度激光选区熔化Inconel 718合金中的微小孔隙缺陷和拉伸性能[J]. 稀有金属材料与工程, 2021, 50(10): 3684-3692.
Liu Fencheng, Hu Wenwei, Jia Jiongyu, et al. Micropore defects and tensile properties in high density laser selective melting Inconel 718 alloy[J]. Rare Metal Materials and Engineering, 2021, 50(10): 3684-3692.
[15]庄景云, 杜金辉, 邓群. 变形高温合金GH4169[M]. 北京: 冶金工业出版社, 2006.
[16]Vilaro T, Colin C, Bartout J D, et al. Microstructural and mechanical approaches of the selective laser melting process applied to a nickel-base superalloy[J]. Materials Science and Engineering A, 2012, 534(2): 446-451.
[17]Avishan B, Sefidgar A, Yazdani S. High strain rate deformation of nanostructured super bainite[J]. Journal of Materials Science, 2018, 54(4): 3455-3468.
[18]周玉. 材料分析方法[M]. 北京: 机械工业出版社, 2004.