On the fatigue and dwell-fatigue behavior of a low-density steel and the correlated microstructure origin of damage mechanism

Journal of Materials Research and Technology

A.S. Anousheh¹  M. Jaskari¹  Junha Yang²  F. Berto³  L.P. Karjalainen⁴  A. Moshiri⁵  H.R. Abedi⁵  A. Zarei-Hanzaki⁵  Seok Su Sohn⁶ 

[1] Corresponding author.;Materials Engineering, Iran University of Science and Technology (IUST), Tehran, Iran;Center for High Entropy Alloys, Pohang University of Science and Technology, Pohang, 37673, Republic of Korea;Department of Material Science and Engineering, Korea University, 145 Anam-Ro, Seongbuk-Gu, Seoul, 02841, Republic of Korea;Hot Deformation and Thermomechanical Processing Laboratory of High Performance Engineering Materials, School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran, Iran;;School of Metallurgy &

关键词: Dynamic strain aging;    Cyclic deformation;    Dwell-fatigue;    Low-density steel;    Fractography;    Damage mechanism;   

DOI  :  

来源: DOAJ

【 摘 要 】

The present work deals with revealing the fatigue and dwell-fatigue behavior and correlated damage mechanisms of Fe–Mn–Al–C lightweight steel. Surprisingly, alteration in loading mode from monotonic to cyclic induces reversible dislocation movement and facilitates the occurrence of dynamic strain aging. Additionally, applying dwell time by an acceleration of strain aging intensified stress asymmetry during dwell fatigue. The occurrence of strain aging has a bilateral effect on the crack initiation and growth. On one hand, strain aging stimulates twin formation and retards fatigue crack initiation, however, on the other hand, reduces hardening capacity, restricts the plastic deformation and facilitates crack propagation.

【 授权许可】

Unknown