Corrosion Effects on the Fatigue Crack Propagation of Giga-Grade Steel and its Heat Affected Zone in pH Buffer Solutions for Automotive Application

4th International Conference on Advanced Engineering and Technology

Lee, H.S.^1

Department of Automotive Management Engineering, Joongbu University, Goyang-si, Gyeonggi-do

10279, Korea, Republic of^1

关键词: Automotive applications;    Average corrosion rates;    Base metals;    Corrosion effects;    Corrosive environment;    Crack length;    Model prediction;    Pure corrosion;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/317/1/012023/pdf
DOI  :  10.1088/1757-899X/317/1/012023

来源: IOP

【 摘 要 】

Corrosion fatigue crack propagation test was conducted of giga-grade steel and its heat affected zone in pH buffer solutions, and the results were compared with model predictions. Pure corrosion effect on fatigue crack propagation, particularly, in corrosive environment was evaluated by means of the modified Forman equation. As shown in results, the average corrosion rate determined from the ratio of pure corrosion induced crack length to entire crack length under a cycle load were 0.11 and 0.37 for base metal and heat affected zone, respectively, with load ratio of 0.5, frequency of 0.5 and pH 10.0 environment. These results demonstrate new interpretation methodology for corrosion fatigue crack propagation enabling the pure corrosion effects on the behavior to be determined.