Influence of Stress Corrosion Cracking on Crack Tip Creep and Crack Propagation Rate in Welded Joints

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

Strength of Materials Pub Date : 2024-09-17 DOI:10.1007/s11223-024-00675-z

Y. H. Cui, J. L. Zhang

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引用次数: 0

Abstract

Crack tip creep is a key parameter affecting the stress corrosion cracking (SCC) growth rate of nickel base alloy structural materials, significantly impacting the stress corrosion cracking rate of austenitic stainless steel and other materials. To explore the variation law of the crack tip creep field at different positions from the weld-seam of the welded joint, a numerical calculation model of the welded joint under different crack initiation positions was established based on alloy 600, and the crack tip stress field and creep were analyzed in detail. Results show that the unevenness of the material will cause obvious stress discontinuity at the crack tip of the material boundary; as the distance between the crack position and the weld interface increases, the stress of the crack tip before creep is affected by the mechanical properties of the base metal decreases. The creep rate of the weld side cracks gradually increases with the distance from the material interface. The minimum crack growth rate appears when the crack is located at the interface between the Ni-based alloy and base metal. The increased distance from the material interface increases the crack growth rate gradually. When the distance from the interface \(d>\) 0.1mm, the influence of mechanical properties on the growth rate is weakened.

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应力腐蚀开裂对焊接接头裂纹尖端蠕变和裂纹扩展速率的影响

裂纹尖端蠕变是影响镍基合金结构材料应力腐蚀开裂（SCC）增长速率的关键参数，对奥氏体不锈钢等材料的应力腐蚀开裂速率有显著影响。为探索焊接接头焊缝不同位置裂纹尖端蠕变场的变化规律，建立了基于合金 600 的不同裂纹起始位置下焊接接头的数值计算模型，并对裂纹尖端应力场和蠕变进行了详细分析。结果表明，材料的不均匀性会在材料边界的裂纹尖端造成明显的应力不连续；随着裂纹位置与焊接界面之间距离的增加，蠕变前裂纹尖端的应力受母材力学性能的影响减小。焊缝侧裂纹的蠕变速率随着与材料界面距离的增加而逐渐增大。当裂纹位于镍基合金和基体金属的界面时，裂纹增长率最小。与材料界面的距离增加，裂纹生长率也逐渐增加。当与界面的距离（d>）为 0.1mm 时，机械性能对裂纹生长率的影响减弱。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.