Effects of hot isostatic pressing and heat treatment process on microstructure and tensile properties of selective laser melting manufactured GH4169 alloy
SHI Lei1, LEI Li-ming1, WANG Wei1, FU Xin1, ZHANG Guang-ping2
1. AECC Shanghai Commercial Aircraft Engine Manufacturing Co., Ltd., Shanghai 201306, China;
2. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
Abstract：GH4169 alloys were manufactured by selective laser melting (SLM). The microstructure evolution and tensile properties of GH4169 alloys during hot isostatic pressing(HIP) and heat treatment(HT) process were analyzed by OM,SEM,EBSD and TEM. The results show that the grains of the as-deposited samples in the building direction are columnar, exhibit very fine cellular-dendritic structure with fine Laves phases precipitating in the interdendritic region. Most of porosities and Laves phases disappear after HIP, and the microstructure parallel to the building direction is transformed into equiaxed grains. Short rod-like δ phases are precipitated along grain boundaries after annealing at 980 ℃ for 1 h. The tensile properties at room temperature and 650 ℃ of specimens after HIP and HT are higher than those of the standard requirements for the forgings, and the temperature has a little influence on the fracture mode.
石磊, 雷力明, 王威, 付鑫, 张广平. 热等静压/热处理工艺对激光选区熔化成形GH4169合金微观组织与拉伸性能的影响[J]. 材料工程, 2020, 48(6): 148-155.
SHI Lei, LEI Li-ming, WANG Wei, FU Xin, ZHANG Guang-ping. Effects of hot isostatic pressing and heat treatment process on microstructure and tensile properties of selective laser melting manufactured GH4169 alloy. Journal of Materials Engineering, 2020, 48(6): 148-155.
[1] 齐欢. INCONEL 718(GH4169)高温合金的发展与工艺[J]. 材料工程,2012(8):92-100. QI H. Review of INCONEL 718 alloy: its history, properties, processing and developing substitutes[J]. Journal of Materials Engineering, 2012(8): 92-100.
[2] 娄学明,孙文儒,郭守仁,等. IN718高温合金热腐蚀行为及其对力学性能的影响[J].稀有金属材料与工程, 2008, 37(2):259-263. LOU X M, SUN W R, GUO S R,et al. Hot corrosion behavior of IN718 alloy and its effect on mechanical properties[J]. Rare Metal Materials and Engineering, 2008, 37(2):259-263.
[3] LI X, SHI J J, WANG C H, et al. Effect of heat treatment on microstructure evolution of Inconel 718 alloy fabricated by selective laser melting[J]. Journal of Alloys and Compounds, 2018, 764:639-649.
[4] DENG D Y,PENG R L, BRODIN H, et al.Microstructure and mechanical properties of Inconel 718 processed by selective laser melting: sample orientation dependence and effects of post heat treatments[J]. Materials Science and Engineering:A, 2018, 713:294-306.
[5] 邓晓阳.热处理对3D打印Inconel 718合金组织和力学性能的影响研究[D].南昌:南昌航空大学,2017. DENG X Y.Effect of heat treatment on microstructures and mechanical property of Inconel 718 alloy by 3D print [D]. Nanchang: Nanchang Hangkong University,2017.
[6] SUI S, CHEN J, MING X L, et al.The failure mechanism of 50% laser additive manufactured Inconel 718 and the deformation behavior of Laves phases during a tensile process[J].The International Journal of Advanced Manufacturing Technology, 2017, 91(5/8):2733-2740.
[7] 明宪良,陈静,谭华,等. 激光修复GH4169高温合金的持久断裂机制研究[J].中国激光, 2015, 42(4):1-7. MING X L, CHEN J, TAN H, et al. Research on persistent fracture mechanism of laser forming repaired GH4169 superalloy[J]. Chinese Journal of Lasers, 2015, 42(4):1-7.
[8] ATKINSON H V, DAVIES S. Fundamental aspects of hot isostatic pressing: an overview[J].Metallurgical and Materials Transactions A, 2000, 31(12):2981-3000.
[9] KIM M T, CHANG S Y, WON J B. Effect of HIP process on the micro-structural evolution of a nickel-based superalloy[J]. Materials Science and Engineering:A, 2006, 441(1/2):126-134.
[10] TILLMANN W, SCHAAK C, NELLESEN J, et al.Hot isostatic pressing of IN718 components manufactured by selective laser melting[J]. Additive Manufacturing, 2017, 13:93-102.
[11] HEBERT R J. Viewpoint: metallurgical aspects of powder bed metal additive manufacturing[J].Journal of Materials Science, 2016, 51(3):1165-1175.
[12] TAN J H, LEONG W, WONG E, et al.An overview of powder granulometry on feedstock and part performance in the selective laser melting process[J].Additive Manufacturing, 2017, 18:228-255.
[13] KURZ W, FISHER D J. Fundamentals of solidification [M].4th ed.Uetikon-Zuerich,Switzerland:Trans Tech Publications Ltd, 1998.
[14] BASAK A, ACHARYA R, DAS S. Additive manufacturing of single-crystal superalloy CMSX-4 through scanning laser epita-xy: computational modeling, experimental process development, and process parameter optimization[J]. Metallurgical and Materials Transactions A, 2016, 47(8):3845-3859.
[15] FU S H, DONG J X, ZHANG M C, et al.Alloy design and development of INCONEL718 type alloy[J]. Materials Science and Engineering:A, 2009, 499(1/2):215-220.
[16] 凌斌,钟炳文,杨玉荣,等. GH169合金的相变研究[J]. 航空材料学报, 1994, 14(4):1-7. LING B, ZHONG B W, YANG Y R, et al.On the phase transformation in superalloy GH169[J]. Journal of Aeronautical Materials, 1994, 14(4):1-7.
[17] AZADIAN S, WEI L Y, WARREN R. Delta phase precipitation in Inconel 718[J]. Materials Characterization, 2004, 53(1):7-16.
[18] 张善勇,隋玉俭. 铸造高温合金的热等静压致密化机理[J]. 钢铁研究学报, 1985, 5(增刊1):77-83. ZHANG S Y, SUI Y J. HIP densification mechanisms for cast superalloys[J]. Journal of Iron and Steel, 1985, 5(Suppl 1):77-83.
[19] 刘东,罗子健. GH4169合金热加工过程中的显微组织演化数学模型[J].中国有色金属学报, 2003, 13(5):1211-1218. LIU D, LUO Z J. Mathematical model for microstructure evolution of GH4169 alloy during hot working process [J]. The Chinese Journal of Nonferrous Metals, 2003, 13(5):1211-1218.
2020, Vol. 48 
