Effect and Optimal Design of the Material Constraint in the DMWJ of Nuclear Power Plants

doi:10.11900/0412.1961.2019.00298

Acta Metall Sin

2020, Vol. 56

Issue (6): 840-848 DOI: 10.11900/0412.1961.2019.00298

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Effect and Optimal Design of the Material Constraint in the DMWJ of Nuclear Power Plants

YANG Jie(

), WANG Lei

Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China

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YANG Jie, WANG Lei. Effect and Optimal Design of the Material Constraint in the DMWJ of Nuclear Power Plants. Acta Metall Sin, 2020, 56(6): 840-848.

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Abstract

The material constraint is an important factor affecting the fracture behavior of dissimilar metal welded joint (DMWJ). For accurately design, manufacture and structure integrity assessment, is necessary to clarify the influence of material constraint on the DMWJ. However, there is still a lack of a systematic research on the influence of material constraint on the fracture behavior of the DMWJ in the current nuclear power plants, and how to improve the fracture resistance of the DMWJ by the optimal design of the material constraint should be considered. In this work, a 52M nickel-based alloy DMWJ in nuclear power plants was selected, the initial crack which located in the heat affected zone (HAZ) was manufactured, and the fracture behaviors of the DMWJ under different material constraints of HAZ, fusion zone (FZ) and near interface zone (NIZ) were studied. In addition, the optimal design of the material constraint was investigated. The results show that for the HAZ crack, the J-resistance curves increase monotonously with increasing the strength of HAZ where the crack is located in. And the J-resistance curves increase firstly, then decrease and remain steady with increasing the strength of FZ and NIZ where the crack is nearby. The optimized DMWJs have higher J-resistance curves, and when M_s (HAZ): M_s (FZ):M_s (NIZ)=2:1.4:0.84, the optimized DMWJ has the highest J-resistance curve which is several times of the current J-resistance curve.

Key words: material constraint dissimilar metal welded joint fracture behavior optimal design

Received: 10 September 2019

ZTFLH:

TH114

Fund: National Natural Science Foundation of China(51975378);National Natural Science Foundation of China(51605292)

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https://www.ams.org.cn/EN/10.11900/0412.1961.2019.00298 OR https://www.ams.org.cn/EN/Y2020/V56/I6/840

Fig.1 Connection diagram of the dissimilar metal welded joint (DMWJ) with nozzle and safety end of nuclear pressure vessel
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Fig.2 The DMWJ (a) and different subareas near the A508/52Mb interface (b) (HAZ—heat affected zone, FZ—fusion zone, NIZ—near interface zone; unit: mm)

Table 1 Chemical compositions of the four materials used for fabrication of the DMWJ^[35]

Fig.3 The true stress-strain curves of the four materials composed of the DMWJ and different subareas

Fig.4 The sampling (a) and geometry (b) of the single edge-notched bend (SENB) specimen (L—distance between the two support points, W—specimen width, B—specimen thickness, F—load)
Color online

Table 2 The Gurson-Tvergaard-Needleman (GTN) damage parameters of different materials^[36]

Fig.5 The whole meshes of the SENB specimen (a) and the local meshes at the crack tip (b)

Fig.6 The effects of material constraint changing in HAZ on the J-resistance (J-R) curves (a) and crack growth paths (b) (Δa—crack extension, M_s—ratio of the strength after deformation to the strength before deformation under the same strain)

Fig.7 The effects of material constraint changing in FZ on the J-R curves (a) and crack growth paths (b)

Fig.8 The crack growth path at M_s=0.5 (VVF—void volume fraction)
Color online

Fig.9 The effects of material constraint changing in NIZ on the J-R curves (a) and crack growth paths (b)

Fig.10 The crack growth path of un-deformed meshes (a) and deformed meshes (b) at M_s=0.6
Color online

Fig.11 The J-R curves under different optimized material constraints

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