Influence of Pt-Al Coating on Tensile Properties of DD413 Alloy at High Temperatures

doi:10.11900/0412.1961.2022.00241

Acta Metall Sin

2023, Vol. 59

Issue (3): 424-434 DOI: 10.11900/0412.1961.2022.00241

Research paper

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Influence of Pt-Al Coating on Tensile Properties of DD413 Alloy at High Temperatures

WANG Di¹^,², HE Lili³, WANG Dong²(

), WANG Li², ZHANG Siqian¹, DONG Jiasheng², CHEN Lijia¹, ZHANG Jian²

1 School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China
2 Shi -changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
3 AECC Southern Industrial Limited Company, Zhuzhou 412000, China

Cite this article:

WANG Di, HE Lili, WANG Dong, WANG Li, ZHANG Siqian, DONG Jiasheng, CHEN Lijia, ZHANG Jian. Influence of Pt-Al Coating on Tensile Properties of DD413 Alloy at High Temperatures. Acta Metall Sin, 2023, 59(3): 424-434.

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Abstract

The Pt-Al coating is a vital section of aero-engine power blades that can improve the operating temperature of the blade. The blade is subjected to axial tensile stress during operation. Both the oxidation of the Pt-Al coating and the microstructure evolution caused by the element diffusion between the coating and the matrix at high temperatures affect the service performance of the blade. However, the specific mechanisms remain unclear. In this work the effect of Pt-Al coating on the tensile properties of a DD413 alloy was studied. SEM and TEM were used to compare the tensile properties of the uncoated and Pt-Al-coated samples, respectively, at 760 and 980^oC. Lower yield strength was detected in Pt-Al-coated samples than that in uncoated samples at 760 and 980^oC. The different crack initiation modes and deformation mechanisms of Pt-Al coating at 760 and 980^oC mainly result from the ductile to brittle transition temperature (DBTT). At high temperatures, the transition from β to γ′ is conducive to the dislocation slip, which leads to the plastic deformation of the Pt-Al coating. The increase in the tensile strength of the Pt-Al layer above DBTT can be attributed to the solidified solution-strengthening effect of Pt in β-NiAl.

Key words: Pt-Al coating single crystal superalloy tensile property ductile to brittle transition temperature

Received: 12 May 2022

ZTFLH:

TG141

Fund: National Science and Technology Major Project of China(P2021-A-IV-001-002);National Science and Technology Major Project of China(2017-Ⅵ-0019-0091);National Science and Technology Major Project of China(J2019-Ⅵ-0010-0124);National Natural Science Foundation of China(51771204)

About author: WANG Dong, professor, Tel: (024)23748876, E-mail: dwang@imr.ac.cn

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	Di WANG
	Lili HE
	Dong WANG
	Li WANG
	Siqian ZHANG
	Jiasheng DONG
	Lijia CHEN
	Jian ZHANG

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https://www.ams.org.cn/EN/10.11900/0412.1961.2022.00241 OR https://www.ams.org.cn/EN/Y2023/V59/I3/424

Fig.1 Schematic of tensile sample (R_a—surface roughness. unit: mm)

Fig.2 SEM images of initial surface (a) and cross-section (b) of Pt-Al coating (Inset shows grain morphology in the coating. OL—outer layer, IL—inner layer, IDZ—inter diffusion zone)

Fig.3 Nominal stress (σ)-strain (ε) curves of uncoated and Pt-Al coating samples at 760 and 980^oC

Table 1 Tensile properties of uncoated and Pt-Al coating samples at 760 and 980^oC

Fig.4 SEM images of tensile fracture surface of uncoated (a, c) and Pt-Al coating (b, d) samples at 760^oC (a, b) and 980^oC (c, d), respectively (Insets show the high magnified images of the fracture)

Fig.5 SEM images of tensile fracture coating region of Pt-Al coating samples at 760^oC (a) and 980^oC (b)

Fig.6 Secondary electron (SE) images of uncoated samples (a, c) and BSE images of Pt-Al coating samples (b, d) logitudinal-sections tensile fractured along [001] orientation at 760^oC (a, b) and 980^oC (c, d), respectively (Insets show the microstructure of fracture cross-section)

Fig.7 BSE images of tensile fracture cross-sectional morphology of Pt-Al coating samples after etched at 760^oC (a) and 980^oC (b)

Table 2 Thicknesses of cross-sectional structure of Pt-Al coating sample initial and after tensile test

Fig.8 SEM images of tensile tested uncoated (a, c) and Pt-Al coating (b, d) samples at 760^oC (a, b) and 980^oC (c, d), respectively (Inset shows the γ′ deformation morphology)

Fig.9 TEM images of dislocation configuration of tensile deformed structure of uncoated (a, c) and Pt-Al coating (b, d) samples at 760^oC (a, b ) and 980^oC (c, d), respectively

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