Effects of W Concentration on Creep Microstructure and Property of Novel Co-Based Superalloys

doi:10.11900/0412.1961.2023.00118

Acta Metall Sin

2023, Vol. 59

Issue (9): 1209-1220 DOI: 10.11900/0412.1961.2023.00118

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Effects of W Concentration on Creep Microstructure and Property of Novel Co-Based Superalloys

CHEN Jia, GUO Min, YANG Min, LIU Lin, ZHANG Jun(

)

State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China

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CHEN Jia, GUO Min, YANG Min, LIU Lin, ZHANG Jun. Effects of W Concentration on Creep Microstructure and Property of Novel Co-Based Superalloys. Acta Metall Sin, 2023, 59(9): 1209-1220.

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Abstract

γ' precipitate strengthened cobalt-based alloys exhibit superior comprehensive properties and are potential candidates for the anticipated next-generation superalloy. The phase field method, which considers the combined effect of multiple energy fields, effectively elucidates the processing and mechanism of microstructure evolution. By using the ternary elastoplastic phase field model coupled with CALPHAD and crystal plasticity model, the γ' evolution of Co-9Al-xW (x = 8, 9, and 10; atomic fraction, %) alloys during creep processes is simulated herein. The corresponding rafting behaviors and creep properties are evaluated from the perspective of the changes in second-order moment invariant map (SOMIM) and stress/strain fields. The results show that as the W content increases, the volume fraction of the γ' phase increases, the plastic strain in the γ matrix reduces, and rafting occurs with accelerated rate, which enhances the creep property. Further, the SOMIM analysis shows that the raft structure leads to a steady creep behavior in 9W and 10W alloys. In addition, the alloy with a high W content has a high misfit stress in the γ matrix, which leads to a low plastic strain.

Key words: Co-based superalloy phase field simulation creep rafting

Received: 23 March 2023

ZTFLH:

TG146.1

Fund: National Natural Science Foundation of China(51971174);National Natural Science Foundation of China(52031012);National Science and Technology Major Project(J2019-VI-0020-0135);National Key Research and Development Program of China(2017YFB0702902);Research Fund of the State Key Laboratory of Solidification Processing (NPU), China(2022-TZ-01)

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	CHEN Jia
	GUO Min
	YANG Min
	LIU Lin
	ZHANG Jun

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https://www.ams.org.cn/EN/10.11900/0412.1961.2023.00118 OR https://www.ams.org.cn/EN/Y2023/V59/I9/1209

Alloy	Elastic constant of γ / GPa			Elastic constant of γ' / GPa
	$C 11 m$	$C 12 m$	$C 44 m$	$C 11 p$	$C 12 p$	$C 44 p$
Co-9Al-8W (8W)	315	209	160	361	190	212
Co-9Al-9W (9W)	316			363
Co-9Al-10W (10W)	317			364

Table 1 Elastic constants of γ and γ' phases for Co-9Al-xW (x = 8, 9, 10; atomic fraction, %) alloys

Alloy	$r 0 m$	$r 0 p$
8W	18	210
9W	26	235
10W	30	260

Table 2 Initial threshold

r 0 m

and

r 0 p

of slip system for γ matrix and γ' precipitate, respectively

Fig.1 Octahedral slip systems of fcc structure
(a) (111) plane (b) (

1 ¯

11) plane (c) (

1 1 ¯

1) plane (d) (11

1 ¯

) plane

Fig.2 Simulated and experimental^[9] creep property curves of Co-9Al-xW alloys
(a) creep strain (b) creep rate

Fig.3 Simulated (a-c) and experimental^[9] (d-f) results of γ/γ' micrstructures at different plastic strains (1.0%, 1.5%, 2.0%, 3.0%) during 900^oC, 275 MPa compressive creep for alloys with different W contents (The arrows represent the applied compressive stress σ_a; the red elliptical regions imply the corners of γ' precipitate protruding outward; the red rectangular region and the green elliptical region implies the formation of continuous rafts and “small island” γ matrix embedded in the rafted γ', respectively) (a, d) 8W (b, e) 9W (c) 10W (f) 11W (Co-9Al-11W)

Fig.4 Second order moment invariant maps (SOMIM) for 8W (a1-a4), 9W (b1-b4), and 10W (c1-c4) at strains of 1.0% (a1-c1), 1.5% (a2-c2), 2.0% (a3-c3), and 3.0% (a4-c4) ( $ω ¯ 1$ , $ω ¯ 2$ —second order moment invariants)

Fig.5 Fraction of γʹ precipitates in the SOMIM for which 0 < $ω ¯ 1$ ≤ 0.5

Fig.6 Raft structure characteristics variations during 900^oC, 275 MPa creep for 8W, 9W, and 10W alloys
(a) γ' volume fraction (b) raft thickness (c) raft length (d) γ channel width

Fig.7 Evolution of plastic strain during creep for alloys 8W (a), 9W (b) and 10W (c), and mean strain in γ (d) and γ' (e) phases (The box areas show the large plastic deformations)

Fig.8 Evolution of resolved shear stress during creep for alloy 8W (a), 9W (b) and 10W (c), and mean resolved shear stress in γ phase (d) and γ' phase (e)

Fig.9 Evolution of resistance results from dislocation interaction for alloy 8W (a), 9W (b) and 10W (c), and mean resistance in γ phase (d) and γ' phase (e)

Fig.10 Mean driving forces of dislocation activity in γ phase (a) and γ' phase (b)

Fig.11 Evolution of mean internal stresses (a, b) and mean σ₃₃ (c, d) in γ phase (a, c) and γ' phase (b, d)

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