J. Mater. Sci. Technol. ›› 2025, Vol. 213: 288-299.DOI: 10.1016/j.jmst.2024.04.087

• Research Article • Previous Articles     Next Articles

Inhibition of the intergranular brittleness of HR3C heat-resistant steel by strain-aging induced nano-M23C6 dispersion precipitation

Xuehan Wanga, Lining Xua,*, Lang Jiaoa, Wenyao Lia, Jinna Meib, Yanfen Zhaob, Lijie Qiaoa,*   

  1. aBeijing Advanced Innovation Center for Materials Genome Engineering, Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, PR China;
    bSuzhou Nuclear Power Research Institute, Suzhou 215004, PR China
  • Received:2024-02-27 Revised:2024-04-12 Accepted:2024-04-12 Published:2025-04-01 Online:2025-04-01
  • Contact: *E-mail address: xulining@ustb.edu.cn (L. Xu), lqiao@ustb.edu.cn (L. Qiao)

Abstract: M23C6 chromium-rich carbides are common grain-boundary precipitations in Cr-containing steel. The presence of grain-boundary carbides often leads to intergranular brittleness and decreases mechanical properties. This study proposes a deformation and aging technique to obtain a high-volume-fraction dispersion distribution of the hard nano-M23C6 phase by changing the nucleation sites from grain boundaries to deformation coherent twin boundaries produced during cold deformation. The M23C6 precipitation-strengthened austenitic stainless steel has a strength of up to 1.4 GPa but maintains favorable plasticity (> 11 %). This study provides a novel approach for the control of intergranular brittleness in metallic materials.

Key words: HR3C steel, M23C6 chromium-rich carbides, Cold deformation, Intergranular brittleness, Deformation coherent twin boundary