Effects of Vanadium on Microstructure and Mechanical Properties of a Wrought Nickel-based Superalloy

doi:10.11901/1005.3093.2018.571

Chinese Journal of Materials Research

2019, Vol. 33

Issue (6): 419-426 DOI: 10.11901/1005.3093.2018.571

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Effects of Vanadium on Microstructure and Mechanical Properties of a Wrought Nickel-based Superalloy

Shuo HUANG¹(

),Yuwei HE²,Guohua XU¹,Ran DUAN^1,²,Lei WANG²,Guangpu ZHAO¹

1. Department of High-temperature Materials, Central Iron and Steel Research Institute, Beijing 100081, China
2. School of Materials Science and Engineering, Northeastern University, Shenyang 110006, China

Cite this article:

Shuo HUANG,Yuwei HE,Guohua XU,Ran DUAN,Lei WANG,Guangpu ZHAO. Effects of Vanadium on Microstructure and Mechanical Properties of a Wrought Nickel-based Superalloy. Chinese Journal of Materials Research, 2019, 33(6): 419-426.

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Abstract

The effect of vanadium (V) addition on the tensile- and stress rupture-property at room temperature and 750℃, and the microstructure evolution of GH4061 alloy, including grain size, carbide and γ′/γ'' phase etc. were investigated by means of tensile- and stress rupture-testing, OM, SEM, TEM and electrochemical extraction and phase analysis of precipitates. The results show that V addition can promote the precipitation of MC-type carbide and γ′/γ'' phase, and refine the grain size slightly. With the increase of V content, the lattice constant of γ matrix increases, the mismatch between γ matrix and γ′ phase decreases, and the coarsening of γ′/γ'' phase at 750℃ is restrained. The addition of V does not have significant influence on room temperature tensile property, but apparently benefits the tensile strength and rupture life at 750℃. Furthermore, the GH4061 alloy with 0.4% (mass fraction) V addition shows the best stress rupture property at 750℃.

Key words: metallic materials vanadium content microstructure and mechanical property GH4061 alloy wrought superalloy

Received: 21 September 2018

ZTFLH:

TG146.1

Fund: National Science and Technology Major Project(No. 2018ZX06901028)

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	Shuo HUANG
	Yuwei HE
	Guohua XU
	Ran DUAN
	Lei WANG
	Guangpu ZHAO

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https://www.cjmr.org/EN/10.11901/1005.3093.2018.571 OR https://www.cjmr.org/EN/Y2019/V33/I6/419

Fig.1 OM image of as hot-rolled bars of the GH4061 alloy

Table 1 Nominal composition of the GH4061 alloy (mass fraction, %)

Fig.2 Typical microstructures of asheat-treated bars of the GH4061 alloy: (a) V0, (b) V1, (c) V2 , (d) V3

Fig.3 Effects of V content on the grain size of the GH4061 alloy

Fig.4 Typical SEM morphology of the MC phase

Fig.5 Typical SEM morphology of γ? and γ" phases: (a) specimen V0 and (b) specimen V2

Fig.6 Typical TEM morphology of γ? and γ" phase of specimen V2: (a) bright field and (b) dark field

Table 2 Electrochemistry phase extraction analysis results of the specimen V0 and V2

Fig.7 Typical TEM high resolution morphology of specimen V2: (a) high resolution image and Fourier transform and (b) selected-area diffraction pattern

Fig.8 Effect of V content on the lattice constant and lattice mismatch of GH4061 alloy

Fig.9 Effects of V content on the mechanical properties of GH4061 alloy: (a) room temperature tensile, (b) 750℃ tensile and (c) 750℃/460 MPa rupture

Fig.10 γ? and γ" phase SEM morphology after aged at 750℃ for 180 min: (a) specimen V0 and (b) specimen V2

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