J. Mater. Sci. Technol. ›› 2026, Vol. 256: 84-96.DOI: 10.1016/j.jmst.2025.07.043

• Research Article • Previous Articles     Next Articles

Fatigue cracking criterion induced by defects in high-strength steel

Ziheng Shaoa,b, Zikuan Xua, Yankun Zhua, Bin Wanga, Yanfei Caoa, Xuezhong Gua, Hanzhong Liua, Peng Zhanga,b,*, Hongwei Liua,b, Dianzhong Lia,b, Zhefeng Zhanga,b,*   

  1. aShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;
    bSchool of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
  • Received:2025-07-13 Revised:2025-07-15 Accepted:2025-07-15 Published:2026-06-10 Online:2025-09-08
  • Contact: *E-mail addresses: pengzhang@imr.ac.cn (P. Zhang), zhfzhang@imr.ac.cn (Z. Zhang)

Abstract: Defects affect fatigue performance of high-strength steels significantly, which can be quantitatively enunciated from the perspective of defect size, but not from the perspective of defect shape and type to date. In this work, fatigue crack initiation behaviors at various kinds of high-strength steels containing defects with different shapes and types are comprehensively analyzed. Based on Murakami’s model quantitatively expounding the effect of defect size on the fatigue cracking behaviors of high-strength steels, the damage factors considering defect shape and type, which reflect the intrinsic characteristics of defects, are rationally proposed and introduced. Accordingly, the effects of defect size, shape and type on the fatigue cracking mechanisms of high-strength steels are revealed quantitatively. Finally, a unified fatigue cracking criterion induced by defects in high-strength steels is established, achieving the normalized quantitative description of fatigue cracking behaviors induced by different kinds of defects. The critical size criterion for different kinds of defects inducing the fatigue crack initiation behaviors of high-strength steels is revealed, and a reasonable design strategy for enhancing the fatigue resistance of high-strength steels with multiple kinds of defects is proposed.

Key words: High-strength steel, Defect, Fatigue crack, Fatigue resistanceReferences