Effect of Ru addition on γ/γ′ partitioning behavior of alloying elements, γ/γ′ lattice misfit and 1200 °C creep properties of Ni-based single-crystal superalloy

IF 4.8 2区 材料科学 Q2 CHEMISTRY, PHYSICAL
Haodong Duan , Geng Li , Xiaoyu Chen , Cheng Ai , Jie Kang , Yi Ru , Heng Zhang , Yanling Pei , Shusuo Li , Shengkai Gong , Huibin Xu
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Abstract

The influence of Ru addition on γ/γ′ partitioning behavior of alloying elements, solid solution strengthening degree of γ and γ′ phases, γ/γ′ lattice misfit and 1200 °C/80 MPa creep properties of Ni-based single-crystal superalloys was detailed investigated. Ru addition increased 1200 °C/80 MPa rupture life of Ni-based single-crystal superalloy from 125.93 ± 5.61 h to 179.87 ± 4.43 h. The experimental single-crystal superalloys exhibited a high γ′ phase volume fraction at 1200 °C, which contributed to the superior 1200 °C/80 MPa creep properties of both Ru-free and Ru-containing single-crystal superalloys. In this study, Ru addition increased Mo, Cr, and Re contents in γ phase, and thus increased both solid solution strengthening degree and lattice constant of γ phase. These effects collectively decreased γ/γ′ lattice misfit and γ/γ′ interfacial dislocation network spacing, which increased γ/γ′ interfacial strengthening effect, and ultimately increased 1200 °C/80 MPa creep life. Furthermore, it was revealed that the 1200 °C/80 MPa creep/stress rupture lives of single-crystal superalloys with low thermal stability of γ′ phase, creep/stress rupture lives are dominated by volume fraction of γ′ phase. In contrast, for single-crystal superalloys with high thermal stability of γ′ phase (such as the two single crystal superalloys in this study), the 1200 °C/80 MPa creep/stress rupture lives were primarily governed by γ/γ′ lattice misfit. Therefore, in order to design single-crystal superalloys with excellent 1200 °C/80 MPa creep performance, it is essential to simultaneously improve thermal stability of γ′ phase and decrease γ/γ′ lattice misfit of single crystal superalloys.
Ru添加对ni基单晶高温合金γ/γ′配分行为、γ/γ′晶格失配和1200℃蠕变性能的影响
研究了Ru添加对合金元素γ/γ′配分行为、γ相和γ′相固溶强化程度、γ/γ′晶格失配和ni基单晶高温合金1200℃/80 MPa蠕变性能的影响。Ru的加入使ni基单晶高温合金的1200℃/80 MPa断裂寿命从125.93±5.61 h提高到179.87±4.43 h。实验单晶高温合金在1200℃时表现出较高的γ′相体积分数,这是导致无Ru和含Ru单晶高温合金具有优异的1200℃/80 MPa蠕变性能的原因。在本研究中,Ru的加入增加了γ相中Mo、Cr和Re的含量,从而提高了γ相的固溶强化度和晶格常数。这些效应共同降低了γ/γ′晶格错配和γ/γ′界面位错网络间距,提高了γ/γ′界面强化效果,最终提高了1200℃/80 MPa蠕变寿命。结果表明,γ′相热稳定性较低的单晶高温合金在1200℃/80 MPa时的蠕变/应力断裂寿命受γ′相体积分数的影响。相比之下,对于具有高γ′相热稳定性的单晶高温合金(如本研究中的两种单晶高温合金),其1200℃/80 MPa蠕变/应力断裂寿命主要由γ/γ′晶格失配决定。因此,为了设计出具有优异1200℃/80 MPa蠕变性能的单晶高温合金,必须同时提高γ′相的热稳定性和降低单晶高温合金的γ/γ′晶格失配。
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来源期刊
Intermetallics
Intermetallics 工程技术-材料科学:综合
CiteScore
7.80
自引率
9.10%
发文量
291
审稿时长
37 days
期刊介绍: This journal is a platform for publishing innovative research and overviews for advancing our understanding of the structure, property, and functionality of complex metallic alloys, including intermetallics, metallic glasses, and high entropy alloys. The journal reports the science and engineering of metallic materials in the following aspects: Theories and experiments which address the relationship between property and structure in all length scales. Physical modeling and numerical simulations which provide a comprehensive understanding of experimental observations. Stimulated methodologies to characterize the structure and chemistry of materials that correlate the properties. Technological applications resulting from the understanding of property-structure relationship in materials. Novel and cutting-edge results warranting rapid communication. The journal also publishes special issues on selected topics and overviews by invitation only.
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