Analysis of Material Hardening Effect on the SCC Creep Characteristics Around the Crack Tip in the Welding Zone

IF 0.7 4区材料科学 Q4 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Strength of Materials Pub Date : 2024-05-06 DOI:10.1007/s11223-024-00634-8

X. J. Wen, L. M. Yue

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Abstract

The mechanical properties of the crack tip are vital for material safety evaluation. The weld material of welded joints is prone to work hardening during processing and installation, which changes the material mechanical properties and seriously affects the safety assessment of nuclear power welded joints. At the same time, nuclear power pipelines will creep under high temperatures and cause changes in the mechanical field at the crack tip. This paper obtains the mechanical properties of nickel-based alloy 182 in a nuclear power water environment. With the help of ABAQUS software, the change rules of the crack tip stress field and creep field under different hardening degrees are analyzed, and then the influence on crack tip creep and crack propagation rate is analyzed. Results show that increasing pre-hardening will increase the Mises stress around the crack tip, and the creep around the crack tip is expressed under pre-deformation, indicating that pre-hardening can accelerate the cracking of stress corrosion to a certain extent. Research has shown that the work hardening induced by the pre-deformation has an important influence on the creep rate at the crack tip, and the high creep zone is mainly concentrated in the direction of crack propagation. Under a certain work hardening rate, the crack growth will be accumulated.

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材料硬化对焊接区裂纹尖端周围 SCC 蠕变特性的影响分析

裂纹尖端的机械性能对材料安全评估至关重要。焊接接头的焊缝材料在加工和安装过程中容易发生加工硬化，从而改变材料的力学性能，严重影响核电焊接接头的安全评估。同时，核电管道在高温下会发生蠕变，导致裂纹尖端的力学场发生变化。本文获得了镍基合金 182 在核电水环境下的力学性能。借助 ABAQUS 软件，分析了不同硬化程度下裂纹尖端应力场和蠕变场的变化规律，进而分析了其对裂纹尖端蠕变和裂纹扩展速率的影响。结果表明，增加预硬化会增加裂纹尖端周围的米塞斯应力，裂纹尖端周围的蠕变在预变形下表现出来，说明预硬化在一定程度上能加速应力腐蚀的开裂。研究表明，预变形引起的加工硬化对裂纹尖端的蠕变率有重要影响，高蠕变区主要集中在裂纹扩展方向。在一定的加工硬化率下，裂纹的增长会不断累积。

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来源期刊

Strength of Materials MATERIALS SCIENCE, CHARACTERIZATION & TESTING-

CiteScore

1.20

自引率

14.30%

发文量

审稿时长

6-12 weeks

期刊介绍： Strength of Materials focuses on the strength of materials and structural components subjected to different types of force and thermal loadings, the limiting strength criteria of structures, and the theory of strength of structures. Consideration is given to actual operating conditions, problems of crack resistance and theories of failure, the theory of oscillations of real mechanical systems, and calculations of the stress-strain state of structural components.