Stress Rupture Properties of the Second Generation Single Crystal Superalloy DD6 after High Temperature Exposure

Jin, Hai Peng; Li, Jia Rong; Liu, Shi Zhong

doi:10.4028/0-87849-432-4.1249

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2021

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“…Figure 7 shows the tensile properties at 760°C obtained by Jin [30] and Wen [7]. Their DD6 single crystal superalloy preparation, heat treatment process and long-term aging temperatures are completely consistent with this study.…”

Section: Resultssupporting

confidence: 83%

Influence of long-term aging on microstructural stability and performance of DD6 superalloy

Kang

Sridar

Wang

et al. 2021

Materials Science and Technology

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In order to investigate the deterioration of microstructure in service, the intrinsic microstructural stability and performance of DD6 during long-term aging without an external load are investigated. During aging at 980°C, γ′ rafting in 〈100〉 and 〈010〉 directions show no anisotropy due to small driving forces. γ′ coarsening and rafting lead to a monotonic decrease in hardness between 200 and 1000 h. However, precipitation of topologically close-packed (TCP) phases occurs significantly during aging at 1050°C. The amount of TCP phases increases initially, and then almost saturates, which results in a decrease in hardness. However, owing to the reduction in the growth of the TCP phases and coarsening of γ′, the hardness saturates for an aging time greater than 500 h.

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Section: Resultssupporting

confidence: 83%