|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||Advanced High Strength Steels IV
||Effect of Pre-straining on High Cycle Fatigue and Fatigue Crack Propagation Behaviors of CP (Complex Phase) Steel
||Su-Min Kim, Taejin Song, Hyokyung Sung, Jehyun Lee, Sangshik Kim
|On-Site Speaker (Planned)
CP (complex phase) steel for automobile application requires good fatigue resistance, as well as high strength. Since Fatigue behavior of steel can vary with metal forming process, fatigue behavior of CP steel with different pre-straining levels of 0, 5 and 9 % were examined in this study. Despite continuous increase in tensile strength with pre-straining from 0 to 9 %, the resistance to high cycle fatigue (HCF) decreased with increasing level of pre-straining from 0 to 5% and then increase with 9% pre-straining. The EBSD and TEM analyses suggested that such an abnormal trend was possibly related to the change in dislocation structure during fatigue loading. Unlike HCF behavior, the fatigue crack propagation (FCP) rates of CP steel tended to decrease slightly with increasing pre-straining from 0 to 9 %. Rather complex trend in HCF and FCP behaviors of CP steel were discussed based on detailed micrographic and fractographic observations.
||Planned: Supplemental Proceedings volume