Effect of Grain Boundary Morphology and MC on Plastic Deformation Behavior of NiCrFe Weld Metal: Crystal Plasticity Finite Element Analysis

doi:10.11901/1005.3093.2019.094

Chinese Journal of Materials Research

2019, Vol. 33

Issue (11): 801-808 DOI: 10.11901/1005.3093.2019.094

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Effect of Grain Boundary Morphology and MC on Plastic Deformation Behavior of NiCrFe Weld Metal: Crystal Plasticity Finite Element Analysis

ZHOU Hui^1,²,WANG Pei^1,²(

),LU Shanping^1,²(

)

1. Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China
2. School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China

Cite this article:

ZHOU Hui,WANG Pei,LU Shanping. Effect of Grain Boundary Morphology and MC on Plastic Deformation Behavior of NiCrFe Weld Metal: Crystal Plasticity Finite Element Analysis. Chinese Journal of Materials Research, 2019, 33(11): 801-808.

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Abstract

Effect of grain boundary morphology and carbide precipitate on local heterogeneous plastic deformation of a NiCrFe weld metal were investigated by the crystal plasticity finite element method. Results show that the plastic deformation behavior is more homogeneous for the sample with tortuous grain boundaries rather than those with straight grain boundaries, since the tortuous grain boundary can promote the activation of slip systems around it more easily. Owning to the significant differences in the critical resolved shear stress and hardening behavior between the MC carbide and matrix, the carbide has much higher stress and lower strain compared with the matrix. The discontinuous stress distribution at the interface between the carbide and matrix may induce fracture initiation during the deformation. The tortuous grain boundaries and MC precipitates have the opposite effect on the ductility, dipping and cracking of the weld metal. Therefore, it should be tried to obtain the weld metal with tortuous grain boundaries while minimizing MC precipitates for engineering application.

Key words: metallic materials ductility dipping cracking crystal plasticity grain boundary morphology MC precipitate

Received: 02 February 2019

ZTFLH:

TG404

Fund: Key Research Program of the Chinese Academy of Sciences(ZDRW-CN-2017-1);Key R & D Program of Jiangsu Province(BE2018113)

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	Hui ZHOU
	Pei WANG
	Shanping LU

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https://www.cjmr.org/EN/10.11901/1005.3093.2019.094 OR https://www.cjmr.org/EN/Y2019/V33/I11/801

Fig.1 Tensile engineering stress-strain curve of a smooth NiCrFe weld metal specimen that is used for the determination of the material parameters

Slip system	Slip plane	Slip direction
γ₁	$(111)$	$[0 1 ˉ 1]$
γ₂	$(111)$	$[10 1 ˉ]$
γ₃	$(111)$	$[1 ˉ 10]$
γ₄	$(1 ˉ 11)$	$[101]$
γ₅	$(1 ˉ 11)$	$[110]$
γ₆	$(1 ˉ 11)$	$[0 1 ˉ 1]$
γ₇	$(1 1 ˉ 1)$	$[011]$
γ₈	$(1 1 ˉ 1)$	$[110]$
γ₉	$(1 1 ˉ 1)$	$[10 1 ˉ]$
γ₁₀	$(11 1 ˉ)$	$[011]$
γ₁₁	$(11 1 ˉ)$	$[101]$
γ₁₂	$(11 1 ˉ)$	$[1 ˉ 10]$

Table 1 Slip systems used in the crystal plasticity model

Parameter	Symbol	Matrix	MC	Unit
Elastic moduli	E	143000	650000	MPa
Reference strain rate	$γ ˙ (α)$	0.001	0.001	1/s
Rate sensitivity parameter	m	20	50	1
Initial slip resistance	τ₀	53	120	MPa
Saturation slip resistance	τ_s	225	350	MPa
Initial hardening modulus	h₀	160	240	MPa
Hardening ratio	q	1	1	1

Table 2 Material parameters of NiCrFe weld metal and MC precipitate that used in crystalline plasticity finite element method

Fig.2 SEM image of the NiCrFe weld metal sample with tortuous grain boundary (a); representative volume element model of specimen with straight grain boundary (b); representative volume element model of specimen with tortuous grain boundary (c) and representative volume element model of specimen with MC precipitates at tortuous grain boundaries (d)

Fig.3 Deformation behaviors of the NiCrFe weld metal specimen with straight grain boundaries after 10% straining (a) von Misses stress distribution, (b) equivalent strain distribution, (c) lattice rotation angle distribution

Fig.4 Deformation behavior of the NiCrFe weld metal specimen with tortuous grain boundaries after 10% straining (a) von Misses stress distribution, (b) equivalent strain distribution, (c) lattice rotation angle distribution

Fig.5 Evolution of activated slip strain at node A (a); node B (b); node C (c) and node D (d) of the NiCrFe weld metal specimens

Fig.6 Deformation behavior of the NiCrFe weld metal specimen with MC precipitates at tortuous grain boundaries after 10% straining (a) Mises stress distribution, (b) equivalent strain distribution, (c) lattice rotation angle distribution

Fig.7 Evolution of activated slip strain at node F (a) and node E (b) of NiCrFe weld metal specimen with MC precipitate at tortuous grain boundaries

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