锻压技术

镍基合金600裂尖蠕变率对应力腐蚀裂纹扩展速率的影响

英文标题：Effect of creep rate at crack tip on stress corrosion crack propagation rate for nickel-based alloy 600

作者：杨宏亮1 薛河2 王正2 张雨彪2

分类号：TG404

出版年,卷(期):页码：2025,50(1):231-238

摘要：

为了简化镍基合金600的应力腐蚀裂纹扩展速率定量计算模型，在分析Ford-Andresen模型的基础上，以应力腐蚀裂纹尖端的蠕变率作为裂纹扩展的主要驱动力，提出以材料裂尖蠕变率代替Ford-Andresen模型中的裂尖应变率，获得以裂尖蠕变率为力学参量的应力腐蚀裂纹扩展速率定量预测模型。以镍基合金600的蠕变特性及其力学参量为基础，通过有限元模拟获得裂尖应力与裂尖应力强度因子的关系，进一步简化并建立了以裂尖应力强度因子为表征的蠕变率定量计算模型。结果表明：镍基合金600的蠕变应力指数和蠕变系数越大，裂尖蠕变率越大，增大了裂纹扩展驱动力，加速了裂纹扩展，且材料的硬化指数对裂尖蠕变率和裂纹扩展速率的影响较大，但裂纹扩展速率随着裂尖电流衰减指数的增大而减小；以应力强度因子为力学参量的裂纹扩展速率计算模型不仅简化了裂尖应变率的计算，而且也在一定程度上解决了裂尖应变率难以准确获得的问题。

In order to simplify the quantitative calculation model of stress corrosion crack (SCC) propagation rate for nickel-based alloy 600, based on the analysis of Ford-Andresen model, creep rate at tip of SCC was taken as main driving force for crack propagation. Then, the material crack tip creep rate was proposed to replace the crack tip strain rate in the Ford-Andresen model, and a quantitative prediction model for SCC propagation rate with the crack tip creep rate as the mechanical parameter was obtained. Furthermore, based on creep characteristics and mechanical parameters of nickel-based alloy 600, the relationship between crack tip stress and crack tip stress intensity factor was obtained by finite element simulation, and a quantitative calculation model for creep rate characterized by crack tip stress intensity factor was further simplified and established. The results show that the larger the creep stress index and creep coefficient of nickel-based alloy 600, the higher the crack tip creep rate, which increases the driving force of crack propagation and accelerates the crack propagation. The hardening index of the material has a significant impact on crack tip creep rate and crack propagation rate, but crack propagation rate decreases with the increasing of crack tip current decay index. The crack propagation rate calculation model based on stress intensity factor as a mechanical parameter not only simplifies the calculation of crack tip strain rate, but also solves the problem of difficult to accurately obtain crack tip strain rate to a certain extent.

基金项目：

陕西省自然科学基础研究计划项目(2023-JC-YB-451)；国家自然科学基金资助项目(52075434)

作者简介：杨宏亮(1981-)，男，博士，工程师 E-mail：hl_yang@163.com

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