Effect of Thermal Processes on Creep Properties of a Nickel-based Single Crystal Superalloy

doi:10.11901/1005.3093.2024.055

Chinese Journal of Materials Research

2025, Vol. 39

Issue (3): 161-171 DOI: 10.11901/1005.3093.2024.055

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Effect of Thermal Processes on Creep Properties of a Nickel-based Single Crystal Superalloy

HU Pengqin¹^,², WANG Dong²(

), LU Yuzhang², ZHANG Jian²(

)

^1.School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
^2.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Cite this article:

HU Pengqin, WANG Dong, LU Yuzhang, ZHANG Jian. Effect of Thermal Processes on Creep Properties of a Nickel-based Single Crystal Superalloy. Chinese Journal of Materials Research, 2025, 39(3): 161-171.

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Abstract

The effect of heating history, such as those related with standard heat treatment, hot isostatic pressing (HIP), coating and brazing thermal processes, on the microstructure and creep properties (at 760 ^oC/790 MPa and 980 ^oC/248 MPa) of a first generation nickel-based single crystal superalloy DD413 was investigated. The results show that the microstructure and creep behavior of nickel-based single crystal superalloy DD413 are significantly affected by different thermal processes. Compared with the standard heat treatment, HIP reduces the size of γʹ and γ channel, but increases the volume fraction of γʹ phase. Meanwhile, micro-pores in the alloy are effectively eliminated by HIP, which improves the creep life. The coating thermal process preparation can coarsen the γʹ and γ channel, reduce the volume fraction of γʹ phase, and delay the rafting kinetics of γʹ phase at high temperature, therewith, reduce the creep property of the alloy. The brazing thermal process not only causes the coarsening of γ′ phase but also destroys the cubic degree of γ′ phase, leading to significant reduction in creep property of the alloy.

Key words: metallic materials single crystal superalloy hot isostatic pressing coating thermal process brazing thermal process creep behavior

Received: 24 January 2024

ZTFLH:

TG132.32

Fund: National Key Research and Development Program of China(2021YFA1600603);National Natural Science Foundation of China(52071219);National Science and Technology Major Project(J2019-IV-0006-0074);National Science and Technology Major Project(J2019-VI-0010-0124);Science Center for Gas Turbine Project(P2021-AB-IV-001-002);Science Center for Gas Turbine Project(P2022-C-IV-001-001)

Corresponding Authors: ZHANG Jian, Tel: (024)23971196, E-mail: jianzhang@imr.ac.cn

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https://www.cjmr.org/EN/10.11901/1005.3093.2024.055 OR https://www.cjmr.org/EN/Y2025/V39/I3/161

Table 1 Heat treatment processes used in this work

Table 2 Summary of interruption points at primary and steady stages

Fig.1 Microstructure of DD413 after different thermal processes (a, c, e, g) dendrite region; (b, d, f, h) interdendrite region; (a, b) standard heat treatment; (c, d) HIP; (e, f) coating thermal process; (g, h) brazing thermal process

Table 3 Volume fraction and size of γʹ and γ channel after different heat treatment

Fig.2 Creep curves of DD413 after different thermal processes (a, c) 760 ℃/790 MPa; (b, d) 980 ℃/248 MPa

Fig.3 γ/γ′ microstructure evolution in the longitudinal sections of creep specimens treated by different thermal processes. Tests interrupted at different stages under condition of 760 ℃/790 MPa (a~c) HIP; (d~f) coating thermal process; (g~i) brazing thermal process; (a, d, g) 2 h; (b, e, h) 15 h; (c, f, i) fracture sample

Fig.4 γ/γ′ microstructure evolution in the longitudinal sections of creep specimens treated by different thermal processes. Tests interrupted at different stages under condition of 980 ^oC/248 MPa (a, b, c) HIP; (d, e, f) coating thermal process; (g, h, i) brazing thermal process; (a, d, g) 2 h; (b, e, h) 10 h; (c, f, i) fracture sample

Fig.5 Fractograph of specimens treated by different thermal processes after creep under condition of 760 ^oC/790 MPa (a, b) HIP; (c, d) coating thermal process; (e, f) brazing thermal process; (b, d, f) magnified morphologies in box area in Fig.5a, c, e

Fig.6 Fractograph of specimens treated by different thermal processes after creep under condition of 980 ^oC/248 MPa (a, b) HIP; (c, d) coating thermal process; (e, f) brazing thermal process; (b, d, f) magnified morphology in box area in Fig.6a, c, e

Fig.7 Longitudinal sections of specimens treated by different thermal processes after creep under condition of 760 ^oC/790 MPa (a, b) HIP; (c, d) coating thermal process; (e, f) brazing thermal process

Fig.8 Longitudinal sections of specimens treated by different thermal processes after creep under condition of 980 ^oC/248 MPa (a, b) HIP; (c, d) coating thermal process; (e, f) brazing thermal process

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