Effects of Hot Isostatic Pressing on Microstructure and Mechanical Properties of Selective Laser Melted Inconel 718 Alloy in Different Directions

被引：0
作者：
Luo H. [1 ,2 ]
Li X.-Q. [1 ]
Pan C.-L. [1 ]
Zeng K.-L. [2 ]
He P.-J. [2 ]
Pan C.-M. [2 ]
Li H.-Y. [3 ]
机构：
[1] National Engineering Research Center of Near-net-shape Forming for Metallic Materials, South China University of Technology, Guangzhou
[2] Institute of New Materials, Guangdong Academy of Sciences, Guangzhou
[3] Dongguan Hyper Tech Co., Ltd., Dongguan
来源：
Surface Technology | 2022年 / 51卷 / 03期
关键词：
hot isostatic pressure; Inconel; 718; alloy; mechanical properties; microstructure; selective laser melting;
D O I：
10.16490/j.cnki.issn.1001-3660.2022.03.036
中图分类号：
学科分类号：
摘要：
The purpose of this paper is to comprehensively improve the mechanical properties of SLMed Inconel 718 alloy in different building directions by studying the influence of hot isostatic pressure treatment on the microstructure and mechanical properties in the parallel and perpendicular to building direction. Inconel 718 alloy samples were prepared by selective laser melting technology, and SLMed samples were treated by hot isostatic pressure and solid solution aging heat treatment. The microstructure, fracture morphology, phase composition, grain morphology and orientation of the alloy were analyzed by means of metallographic microscope (OM), scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffractometer (XRD) and electron backscattering diffraction (EBSD). The microstructure hardness, tensile strength, yield strength and elongation rate of different forming direction of SLM formed and hip treatment and HIP+HT treatment were analyzed. The results indicated that the grain morphology of SLM Inconel 718 alloy along the building direction had changed from columnar to equiaxial crystal, and the grain size had increased, accompanied by twin formation after the heat isostatic treatment. Meanwhile, most Laves phase around grain boundary had disappeared, and many MC carbides were precipitated in γ matrix. The strength and hardness of the parallel to the building direction were greater than those perpendicular to building direction after different treatment. The tensile strength of the SLMed Inconel 718 alloy parallel and perpendicular to the building direction was 996.3 MPa and 1051.1 MPa respectively. After HIP treatment, the tensile strength in parallel and perpendicular to the deposition direction was increased to 1151.5 MPa and 1167.6 MPa, respectively. Compared with SLM and HIP specimens, HIP+HT specimens perpendicular to the building direction exhibited the highest tensile properties, which was superior to the technical standard values of forgings. The fracture analysis shows that the fracture is ductile in three conditions. Hot isostatic treatment can change grain morphology and orientation in different directions, eliminate cracks and pores and other defects, so the mechanical properties of Inconel 718 alloy fabricated by SLM can be improved comprehensively. © 2022, Chongqing Wujiu Periodicals Press. All rights reserved.
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页码：333 / 341and362
相关论文
共 20 条
[1]  
POLLOCK T M, TIN S., Nickel-Based Superalloys for Advanced Turbine Engines: Chemistry, Microstructure and Properties, Journal of Propulsion and Power, 22, 2, pp. 361-374, (2006)
[2]  
ZHANG Dong-yun, FENG Zhe, WANG Cheng-jie, Et al., Comparison of Microstructures and Mechanical Properties of Inconel 718 Alloy Processed by Selective Laser Melting and Casting, Materials Science and Engineering: A, 724, pp. 357-367, (2018)
[3]  
PEI Chang-hao, SHI Dong, YUAN Huang, Et al., Assess-ment of Mechanical Properties and Fatigue Performance of a Selective Laser Melted Nickel-Base Superalloy Inconel 718, Materials Science and Engineering: A, 759, pp. 278-287, (2019)
[4]  
COSTES J P, GUILLET Y, POULACHON G, Et al., Tool-Life and Wear Mechanisms of CBN Tools in Machining of Inconel 718, International Journal of Machine Tools and Manufacture, 47, 7-8, pp. 1081-1087, (2007)
[5]  
DEBROY T, WEI H L, ZUBACK J S, Et al., Additive Manufacturing of Metallic Components-Process, Structure and Properties, Progress in Materials Science, 92, pp. 112-224, (2018)
[6]  
GU D D, MEINERS W, WISSENBACH K, Et al., Laser Additive Manufacturing of Metallic Components: Materials, Processes and Mechanisms, International Materials Reviews, 57, 3, pp. 133-164, (2012)
[7]  
DU Bo-rui, ZHANG Xue-jun, GUO Shao-qing, Et al., Microstructure and Mechanical Properties of Laser Melting Deposited GH4169 Superalloy, Journal of Materials Engineering, 45, 1, pp. 27-32, (2017)
[8]  
WANG Zhi-qiang, WANG Xue-de, XIE Rui-kun, Et al., Pore Defects of Inconel 718 Alloy Fabricated by Selective Laser Melting, Surface Technology, 49, 9, pp. 378-385, (2020)
[9]  
MCLOUTH T D, BEAN G E, WITKIN D B, Et al., The Effect of Laser Focus Shift on Microstructural Variation of Inconel 718 Produced by Selective Laser Melting, Materials & Design, 149, pp. 205-213, (2018)
[10]  
ZHANG Jie, ZHANG Qun-li, CHEN Zhi-jun, Et al., Effects of Solution Temperature on Microstructure and Properties of Inconel 718 Alloy Fabricatedvia Laser Additive Manu-facturing, Surface Technology, 48, 2, pp. 47-53, (2019)
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