摘要
在模拟压水堆一回路环境下测得690合金的腐蚀疲劳裂纹扩展速率,腐蚀对疲劳裂纹扩展有促进作用.采用时域分析方法分析讨论了相关载荷参数(载荷比R,频率f,应力强度因子幅值ΔK)对腐蚀疲劳裂纹扩展的影响.试验结果采用F-A(Ford-Andresen)模型和ANL(Argonne National Lab)经验公式进行拟合,试验值与预测值吻合较好.断口微观形貌表明,空气中的疲劳断口为穿晶断裂;高温水下的疲劳断口同时出现穿晶和沿晶特征,与F-A模型的机制解释吻合.
Abstract： Corrosion fatigue crack growth rates of Alloy 690 have been measured in air and simulated pres- surized-water reactor （PWR） environment, and environmental acceleration of fatigue crack growth is ob- served. The effects of loading parameters including loading ratio R, frequency f and amplitude of stress in- tensity factors AK have been discussed and summarized by the time-domain method. Furthermore, the ob- tained experimental results are compared with F-A （Ford-Andresen） model and ANL （Argonne National Lab） empirical curve, and they could fit fairly well. Fracture surface morphology reveals tansgranular crack in air fatigue and tansgranular with intergranular crack in hot-water environment, which accords well with the description of F-A model.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
2017年第11期1281-1286,共6页
Journal of Shanghai Jiaotong University
基金
国家科技重大专项(项目号:2010ZX06004-018)资助
