Effect of solution temperature on microstructure and tensile properties of DD416 nickel-based single crystal superalloy

doi:10.13251/j.issn.0254-6051.2024.01.018

Abstract

Abstract: Effect of solution treatment temperature on microstructure and tensile properties of the first generations nickel-based single crystal superalloy DD416 with high strength and low density was studied. The results show that there are obvious component segregation and element segregation in the as-cast specimens. After solution treatment, the component segregation and element segregation in the alloy are obviously improved. With the increase of solution temperature, the content of eutectic structure in the alloy decreases gradually. The pores in the as-cast alloy are cast porosity. After solution treatment, a small number of solution pores appear due to the different diffusion rates of elements, and many hollow pores in the alloy also affect the properties of the alloy. According to the 760 ℃ high temperature tensile data, the tensile properties of the alloy are significantly improved after complete heat treatment. With the increase of solution temperature, the tensile strength and yield strength of the alloy increase, and the elongation after fracture and the percontage reduction of area significantly increase. As a result, after solution treatment+aging, with the increase of solution temperature, the strength and plasticity of the alloy are improved.

Key words: DD416 single crystal superalloy, solution temperature, microstructure, tensile properties

CLC Number:

TG142.1

Chen Bowen, Zeng Qiang, Li Gang, Peng Wenya, Liu Guohuai. Effect of solution temperature on microstructure and tensile properties of DD416 nickel-based single crystal superalloy[J]. Heat Treatment of Metals, 2024, 49(1): 119-126.

References

[1]Guo Jianting. Materials Science and Engineering for Superalloys[M]. Beijing: Science Press, 2008: 300-301.
[2]殷凤仕, 孙晓峰, 胡壮麒, 等. 热处理对M963合金显微组织和拉伸性能的影响[J]. 稀有金属材料与工程, 2004, 33(1): 23-26.
Yin Fengshi, Sun Xiaofeng, Hu Zhuangqi, et al. Effect of heat treatment on the microstructure and tensile properties of the cast nickel-base superalloy M963[J]. Rare Metal Materials and Engineering, 2004, 33(1): 23-26.
[3]Yang J X, Zhang Q, Sun X F, et al. Morphological evolution of γ′ phase in K465 superalloy during thermal fatigue[J]. Transactions of Nonferrous Metals Society of China, 2006, 16(Z3)1: 986-1989.
[4]Jackson M P, Reed R C. Heat treatment of UDIMET 720Li: The effect of microstructure on properties[J]. Materials Science and Engineering A, 1999, 259(1): 85-97.
[5]Monajati H, Jahazi M, Bahrami R, et al. The influence of heat treatment conditions on γ′ characteristics in Udimet[J]. Materials Science and Engineering A, 2004, 373(1): 286-293.
[6]Ges A M, Fornaro O, Palacio H A. Coarsening behavior of a Ni-base superalloy under different heat treatment conditions[J]. Materials Science and Engineering A, 2007, 458(1): 96-100.
[7]Rzyankina E, Pytel M, Mahomed N, et al. Solution heat treatment of single crystal castings of CMSX-4 nickel-base superalloy[C]//International Conference on Competitive Manufacturing. 2016(1): 307-311.
[8]郭建亭, 朱耀宵, 师昌绪. 国外涡轮喷气发动机涡轮盘材料的现状及发展[J]. 金属学报, 1974(1): 74-98.
[9]Sun J X, Liu J L, Liu L R, et al. Effects of Al on microstructural stability and related stress rupture properties of a third generation single crystal superalloy[J]. Journal of Materials Sciences and Technology, 2019, 35(11): 2537-2542.
[10]Zuback J S, Moradifar P, Khayat Z, et al. Impact of chemical composition on precipitate morphology in an additively manufactured nickel base superalloy[J]. Journal of Alloys and Compounds, 2019(7): 446-457.
[11]赵德孜. 海洋环境下燃气轮机涡轮叶片的热腐蚀与防护[J]. 装备环境工程, 2011, 8(5): 100-103.
Zhao Dezi. Hot corrosion and protection of gas turbine blade in marine environment[J]. Equipment Environmental Engineering, 2011, 8(5): 100-103.
[12]Ma S, Zhang J. Alloying effects of refractory elements in the dislocation of Ni-based single crystal superalloys[J]. Progress in Natural Science: Materials International, 2016, 26(6): 636-642.
[13]余竹焕. 碳对单晶高温合金凝固组织及力学性能的影响[D]. 西安: 西北工业大学, 2011.
[14]Coutsouraclis D, 傅恒志. 镍基高温合金中显微疏松程度的评价[J]. 铸造技术, 1984(4): 59-60.
[15]秦升学, 王艳, 张弘斌, 等. 固溶处理对GH99合金组织的影响[J]. 金属热处理, 2020, 45(8): 173-178.
Qin Shengxue, Wang Yan, Zhang Hongbin, et al. Effect of solution treatment on microstructure of GH99 alloy[J]. Heat Treatment of Metals, 2020, 45(8): 173-178.