Effects of Minor Re Adjustment on Microstructure and High-temperature Stress Rupture Properties of the Third Generation Ni-based Single Crystal Superalloy

FANG Xiang; ZHANG Jian; ZHAO Yunsong; YANG Zhenyu; XU Jianwei; WU Qinghui; JIANG Hua; LUO Yushi

doi:10.11973/jxgccl201801007

Materials and Mechanical Engineering > 2018 > 42(1): 33-38,43. > DOI: 10.11973/jxgccl201801007

FANG Xiang, ZHANG Jian, ZHAO Yunsong, YANG Zhenyu, XU Jianwei, WU Qinghui, JIANG Hua, LUO Yushi. Effects of Minor Re Adjustment on Microstructure and High-temperature Stress Rupture Properties of the Third Generation Ni-based Single Crystal Superalloy[J]. Materials and Mechanical Engineering, 2018, 42(1): 33-38,43. DOI: 10.11973/jxgccl201801007

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Effects of Minor Re Adjustment on Microstructure and High-temperature Stress Rupture Properties of the Third Generation Ni-based Single Crystal Superalloy

1. Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, China;
2. AECC Hunan Aviation Powerplant Research Institute, Zhuzhou 412000, China

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Received Date: October 23, 2016
Revised Date: October 17, 2017

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Abstract

Two single crystal superalloys with nominal composition of Ni-9Ta-6Al-6W-4Co-2Cr-0.4Mo-xRe (x was 6.2, 6.8, respectively, mass fraction/%) were prepared. The effects of Re content on the microstructure and phase transition temperature of the as-cast alloys and on the microstructure and high-temperature stress rupture property of the heat-treated alloys were investigated. The results show that a slight increase of Re content resulted in the increase of the solidification segregation degree and the γ+γ' eutectic structure content in the as-cast alloys. The peak temperatures of rapid dissolution of eutectic structure increased during the solid solution process. The size of γ' phase in the heat-treated alloys decreased slightly and the topological close-packed phase formation increased in the stress rupture process. The minor increase of Re changed the element partitioning ratios of Re and Cr significantly, improved the solid solution strengthening effect and increased the high-temperature stress rupture properties of the alloys strikingly.
- the third generation single crystal superalloy,
- Re,
- microstructure,
- high-temperature stress rupture property

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Effects of Minor Re Adjustment on Microstructure and High-temperature Stress Rupture Properties of the Third Generation Ni-based Single Crystal Superalloy

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