Abstract：The ceramic mold was used to control the shape and the GH4169 ultra-fine irregular curved surface was prepared under the high temperature and high pressure flexible medium, the thickness of the curved surface was 0.5 mm. The densification degree of the irregular curved surface was observed and analyzed by SEM. The results show that the densification degree of the curved surface is the densest at both ends, followed by the middle center, and the lowest at the middle edge. At the same time, the Shima-Oyane constitutive equation modified by the uniaxial tension experiment was used to simulate the numerical simulation. The distribution nephogram of density, equivalent Cauchy stress and displacement vector of the neutral surface of the irregular curved surface were obtained. The densification behavior of GH4169 powder in the rigid mold was described from the point of node displacement. The results show that in the process of hot isostatic pressing, the irregular surface shrinks inward along the thickness direction. The displacement of the two ends is the largest, and the density is the highest. The center position in the middle is lower, and the edge in the middle is the lowest. The simulation results are consistent with the experimental results.
马丁, 郎利辉, 肖毅, 孟凡迪, 李世越. 高温高压柔性介质成形GH4169异形超细曲面的致密化行为[J]. 粉末冶金材料科学与工程, 2020, 25(3): 185-190.
MA Ding, LANG Lihui, XIAO Yi, MENG Fandi, LI Shiyue. Densification behavior of GH4169 ultra-fine curved surface irregular structures formed by high temperature and high pressure flexible media. Materials Science and Engineering of Powder Metallurgy, 2020, 25(3): 185-190.
[1] ZHANG C, YU L M, WANG H.Kinetic analysis for high-temperature coarsening of γ″ phase in Ni-based superalloy GH4169[J]. Materials (Basel, Switzerland), 2019, 12(13): 20-25. [2] XU H, HUANG Z C, HAN W, et al.Optimization of 3D printing model data of complex sculpture ceramic mold[C]// Advanced Science and Industry Research Cecter. Proceedings of 2017 2nd International Conference on Modelling, Simulation and Applied Mathematics (MSAM 2017), Bangkok, Thailand: Science and Engineering Research Center, 2017: 35-38. [3] SEGURA I, MURR A L E, TERRAZAS C A, et al. Grain boundary and microstructure engineering of Inconel 690 cladding on stainless-steel 316L using electron-beam powder bed fusion additive manufacturing[J]. Journal of Materials Science & Technology, 2019, 35(2): 351-367. [4] QIAN X, ZHOU J X, HAI N, et al.Effects of hot isostatic pressing temperature on casting shrinkage densification and microstructure of Ti6Al4V alloy[J]. China Foundry, 2017, 14(5): 429-434. [5] 徐文才, 郎利辉, 黄西娜, 等. 铝合金复杂薄壁件热等静压成形数值模拟[J]. 锻压技术, 2019, 44(6): 65-72. XU Wencai, LANG Lihui, HUANG Xina, et al.Numerical simulation of hot isostatic pressing of aluminum alloy complex thin-walled parts[J]. Forging & Stamping Technology, 2019, 44(6): 65-72. [6] SHIMA S, OYANEM. Plasticity theory for porous metals[J]. International Journal of Mechanical Sciences, 1976, 18(6): 285-291. [7] Oyane M, Shima S, Kono Y.Theory of plasticity for porous metals[J]. Bulletin of the JSME, 1973, 16(99): 1254-1262. [8] 瞿宗宏, 刘建涛, 张国星, 等. FGH4097合金热等静压成形数值模拟[J]. 材料热处理学报, 2017(7): 173-179. ZHAI Zonghong, LIU Jiantao, ZHANG Guoxing, et al.Numerical simulation of hot isostatic pressing of FGH4097 alloy[J]. Journal of Materials Heat Treatment, 2017(7): 173-179. [9] GTEEN R J.A plasticity theory for porous solids[J]. International Journal of Mechanical Sciences, 1972, 14(4): 215-224. [10] RAO G A, SRINIVAS M, SARMA D S.Effect of oxygen content of powder on microstructure and mechanical properties of hot isostatically pressed superalloy Inconel 718[J]. Materials Science & Engineering A, 2006, 435: 84-79. [11] JEONG Y Keun, NIIHARAK O.Microstructure and properties of alumina-silicon carbide nanocomposites fabricated by pressureless sintering and post hot-isostatic pressing[J]. Transactions of Nonferrous Metals Society of China, 2011, 21(S1): 1-6. [12] 张义文, 刘建涛. 粉末高温合金研究进展[J]. 中国材料进展, 2013(1): 11-12. ZHANG Yiwen, LIU Jiantao.Research progress of powder superalloys[J]. Progress in China Materials, 2013(1): 11-12. [13] GAO Yang, ZHANG Dongyun, CAO Ming, et al.Effect of δ phase on high temperature mechanical performances of Inconel 718 fabricated with SLM process[J]. Materials Science & Engineering A, 2019, 767: 52-55 [14] SONG W D, HU M L, ZHANG H S, et al.Effects of different heat treatments on the dynamic shear response and shear localization in Inconel 718 alloy[J]. Materials Science & Engineering A, 2018, 725: 76-87. [15] ZHENG X G, SHI Y N, LOU L H.Healing process of casting pores in a Ni-based superalloy by hot isostatic pressing[J]. Journal of Materials Science & Technology, 2015, 31(11): 1151-1157. [16] CHANG L T, SUN W R, CUI Y Y, et al.Effect of heat treatment on microstructure and mechanicalproperties of the hotisostaticpressed Inconel 718 powder compact[J]. Journal of Alloys and Compounds, 2014, 590: 227-232. [17] 赵丰, 姚草根, 范开春, 等. 粉末GH4169合金中的原始颗粒边界问题[J]. 宇航材料工艺, 2012, 42(1): 92-94. ZHAO Feng, YAO Caogen, FAN Kaichun, et al.The original particle boundary problem in powder GH4169 alloy[J]. Aerospace Materials Technology, 2012, 42(1): 92-94.
2020, Vol. 25 
