Effect of V on Microstructure and High Temperature Creep Properties of Diretional Solidified Nickel-base Superalloys

doi:10.11901/1005.3093.2016.101

Chinese Journal of Materials Research

2016, Vol. 30

Issue (6): 465-472 DOI: 10.11901/1005.3093.2016.101

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Effect of V on Microstructure and High Temperature Creep Properties of Diretional Solidified Nickel-base Superalloys

YU Xingfu^1,^*(

), ZHOU Jinhua¹, WU Yuchao¹, YANG Yue¹, WANG Yufei², MAN Yanlin², HUANG Aihua³

1. School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China
2. AVIC Power Shenyang Investment Casting Technology Co. Ltd., Shenyang 110043, China
3. AVIC Commercial Aircraft Engine Co., Ltd., Shanghai 200241, China

Cite this article:

YU Xingfu, ZHOU Jinhua, WU Yuchao, YANG Yue, WANG Yufei, MAN Yanlin, HUANG Aihua. Effect of V on Microstructure and High Temperature Creep Properties of Diretional Solidified Nickel-base Superalloys. Chinese Journal of Materials Research, 2016, 30(6): 465-472.

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Abstract

The effect of alloying element V on the microstructure and high temperature creep properties of a diretional solidified nickel-base superalloy was researched by varying the amount of V addition. The alloy composition was set in a controlled fixedness except for element V, and then the effect of V can be assessed. The alloys were directionally solidified by utilizing Bridgeman casting process and followed by appropriate post heat treatment. The microstructure and high temperature creep properties of the prepared alloys were then characterized. The results shown that, with lower amount of V addition, the alloying V existed mainly in acicular type carbides rather than in blocky type carbides; while for the higher addition of V, the shape of vanadium carbides in the alloys transition from acicular type to blocky type. When the V content reaches 1.04 % in the alloy, the shape of carbides has been transformed into blocky type completely. After solid solution treatment, the carbides in the alloy were dissolved partly, and the acicular carbides in the alloy with lower V content dissolved much more than the blocky carbides in high V content alloy. Under the condition of 980℃/216 MPa and 760℃/725 MPa, the stress rupture life is shorter for the alloy with lower V content, but loger for that with higher V content. The amount of M₂₃C₆ type carbide precipitated at grain boundaries in the alloy with higher V content is less than that with lower V content during creep test and aging heat treatment. During creep test, cracks initiate and grow mainly at the MC type carbide within grains or the M₂₃C₆ type carbides precipitated at the grain boundaries. Therefore, the increase of V content is of benefit for the improvement of creep life of the alloy.

Key words: metallic materials effect of vanadium microstructure nickel-base alloy creep

Received: 25 February 2016

ZTFLH:

TG146.1

About author: *To whom correspondence should be addressed, Tel: (024)25496301, Email: yuxingfu@163.com

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	Xingfu YU
	Jinhua ZHOU
	Yuchao WU
	Yue YANG
	Yufei WANG
	Yanlin MAN
	Aihua HUANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.101 OR https://www.cjmr.org/EN/Y2016/V30/I6/465

Table 1 Nominal composition of bars (%, mass fraction)

Fig.1 Schematic diagram of creep specimen (unit: mm)

Fig.2 Morphologies of carbides in nickel-base columnar crystal superalloy (a) Alloy1, (b) Alloy2, (c) Alloy3

Fig.3 Morphologies of γ' phase in the nickel-base superalloy (a) as-cast, (b) after heat treatment

Fig.4 Morphologies of carbides in nickel-base superalloy after solution (a) Alloy1, (b) Alloy2, (c) Alloy3

Fig.5 Carbides precipitated from grain boundary after fully heat treatment (a) Alloy1, (b) Alloy3

Fig. 6 Morphologies of carbides and EDAX, (a) morphology of rod like carbides, (b) energy spectrum curve of rod like carbide, (c) morphology of bulk like carbides, (d) energy spectrum curve of bulk like carbide

Fig.7 XRD results of extraction from as-cast alloy

Fig.8 Creep curves of various V content alloys under the condition of 980℃/216 MPa

Fig.9 Creep curves of different V content alloys under the condition of 760℃/725 MPa

Table 2 Chemical composition of phases in the alloy (%, mass fraction)

Fig.10 Decomposition of the carbide during creep (a) creep 57 h under the condition of 980℃/216 MPa, (b) creep 1100 h under the condition of 760℃/500 MPa

Fig.11 Morphology of crack around the carbide

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