Creep Microstructure Damage and Influence on Re-creep Behavior for a Nickel-based Single Crystal Superalloy

doi:10.11901/1005.3093.2021.636

Chinese Journal of Materials Research

2023, Vol. 37

Issue (6): 417-422 DOI: 10.11901/1005.3093.2021.636

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Creep Microstructure Damage and Influence on Re-creep Behavior for a Nickel-based Single Crystal Superalloy

ZHANG Min¹, ZHANG Siqian¹(

), WANG Dong², CHEN Lijia¹

^1.School of Material Science and Engineering, Shenyang University of Technology, Shenyang 110870, China
^2.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Cite this article:

ZHANG Min, ZHANG Siqian, WANG Dong, CHEN Lijia. Creep Microstructure Damage and Influence on Re-creep Behavior for a Nickel-based Single Crystal Superalloy. Chinese Journal of Materials Research, 2023, 37(6): 417-422.

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Abstract

Creep tests of Nickel-based single crystal superalloy DD413 were carried out by constant loads of 980℃/200 MPa and 870℃/430 MPa, while which then were terminated at plastic strain just reaches 0.2%, 0.5% and 1% respectively, so that to acquire the microstructure of the alloy by different creep damage states. Later on, the pre-strained alloys were further subjected to re-creep test again, so as to acquire their residual creep properties and to establish the relationship between different degraded microstructure and creep properties. Meanwhile the microstructure damage characteristics of DD413 alloy under thermal-mechanical coupling were simulated and quantitatively characterized. The results show that the degradated damage of DD413 alloy structure mainly includes the decrease of γ' phase volume fraction and the increase of γ' phase rafting degree. The higher the creep temperature, the more serious the microstructure damage, and the worse the alloy's re-creep performance. Compared with γ' phase rafting, the decrease of γ' phase volume fraction has little effect on the creep properties of the alloy.

Key words: metallic materials nickel-based single crystal superalloy creep damage quantified γ' phase rafting

Received: 12 November 2021

ZTFLH:

TG132.3

Fund: National Natural Science Foundation of China(52071219)

Corresponding Authors: ZHANG Siqian, Tel: 13700022372, E-mail: sqzhang@alum.imr.ac.cn

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	ZHANG Min
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	WANG Dong
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https://www.cjmr.org/EN/10.11901/1005.3093.2021.636 OR https://www.cjmr.org/EN/Y2023/V37/I6/417

Fig.1 Microstructure of the DD413 Single-crystal superalloy after heat treatment

Fig.2 Creep curvrs of the DD413 Single-crystal superalloy at 980℃/200 MPa and 870℃/430 MPa

Fig.3 Microstructure of dendrite region the DD413 single-crystal superalloy at cross sections (a) 0.2% at 980℃/200 MPa, (b) 0.2% at 870℃/430 MPa, (c) 0.5% at 980℃/200 MPa, (d) 0.5% at 870℃/430 MPa, (e) 1% at 980℃/200 MPa, (f) 1% at 870℃/430 MPa

Table 1 Quantitative statistics of microstructure parameters of the DD413 single-crystal superalloy after various strain conditions

Fig.4 Microstructure of dendrite region the DD413 single-crystal superalloy at longitudinal sections (a) 0.2% at 980℃/200 MPa, (b) 0.2% at 870℃/430 MPa, (c) 0.5% at 980℃/200 MPa, (d) 0.5% at 870℃/430 MPa, (e) 1% at 980℃/200 MPa, (f) 1% at 870℃/430 MPa

Fig.5 Creep curves of the DD413 single-crystal superalloy after different pre-strains (a) 980℃/200 MPa, (b) 870℃/430 MPa

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