Anisotropic tensile properties and in-situ deformation behavior of Inconel 718 alloy fabricated by laser directed energy deposition

被引:9
作者
Li, Zuo [1 ,2 ]
Lin, Xin [1 ,2 ]
Yang, Haiou [1 ,2 ]
Tan, Hua [1 ,2 ]
Tang, Wenlai [3 ]
Zhong, Chongliang [4 ]
Yao, Bo [1 ,2 ]
Li, Xiangyu [1 ,2 ]
机构
[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, 127 Youyixilu, Xian 710072, Shaanxi, Peoples R China
[2] Northwestern Polytech Univ, Key Lab Met High Performance Addit Mfg & Innovat D, MIIT China, 127 Youyixilu, Xian 710072, Shaanxi, Peoples R China
[3] Nanjing Normal Univ, Sch Elect & Automat Engn, Jiangsu Key Lab 3D Printing Equipment & Mfg, Nanjing 210023, Peoples R China
[4] Fraunhofer Inst Mfg Technol & Adv Mat IFAM, Winterbergstr 28, D-01277 Dresden, Germany
基金
中国国家自然科学基金;
关键词
Laser directed energy deposition; Inconel; 718; Anisotropy; Tensile properties; Loading direction; STRAIN-GRADIENT PLASTICITY; NI-BASED SUPERALLOYS; CLOSE-PACKED PHASES; MECHANICAL-PROPERTIES; HEAT-TREATMENT; LAVES PHASES; MICROSTRUCTURE; PRECIPITATION; TEXTURE; INDENTATION;
D O I
10.1016/j.jallcom.2024.176350
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Low-temperature and short-time solution and aging heat treatment (1050 degree celsius, 15 min/WC + 720 degree celsius, 8 h/FC to 620 degree celsius, 8 h/AC) was proposed for laser repaired Inconel 718 components in consideration of the risks on the heat deformation and properties degradation for the forging body with long-term homogenization treatment. After this heat treatment, the as-built epitaxial columnar grains will be retained and prone to induce the anisotropy of tensile properties. Herein, the bulk sample of Inconel 718 alloy via laser directed energy deposition (LDED) was fabricated followed by heat treatment and the tensile properties were studied under different loading directions (the angle between loading direction and building direction xi=0 degrees, 45 degrees, 90 degrees) in detail. The heat-treated microstructure of Inconel 718 is composed of the epitaxial columnar grains, Laves phase and gamma" phase and the tensile properties present the obvious anisotropy. When xi=0 degrees, alloy possesses the best strength (yield strength, YS: 1139.93 +/- 9.87 MPa; ultimate strength, UTS: 1259.56 +/- 15.77 MPa) and optimal elongation (26.23 +/- 0.96 %). When xi=90 degrees, the YS (1019.51 +/- 10.96 MPa), UTS (1119.54 +/- 7.17 MPa) and elongation (9.15 +/- 3.77 %) are all the worst. When xi=45 degrees, YS (1023.05 +/- 13.78 MPa) and UTS (1209.85 +/- 13.37 MPa) are in the middle level and the elongation reached 21.39 +/- 1.55 %. Based on in-situ tensile results, the strength difference of alloy under different loading directions is the result of the synergistic effect of geometrically necessary dislocations (GNDs) density and Laves phase, and the plasticity difference is primarily attributed to GNDs density.
引用
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页数:15
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