A physically-based constitutive model for a novel heat resistant martensitic steel under different cyclic loading modes : Microstructural strengthening mechanisms

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

16 Scopus Citations
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Author(s)

  • Kai Song
  • Kaimeng Wang
  • Lei Zhao
  • Lianyong Xu
  • Ninshu Ma
  • Yongdian Han
  • Kangda Hao
  • Libin Zhang

Detail(s)

Original languageEnglish
Article number103611
Journal / PublicationInternational Journal of Plasticity
Volume165
Online published10 Apr 2023
Publication statusPublished - Jun 2023

Abstract

Cyclic responses of a novel heat resistant martensitic steel, 9Cr3Co3W1CuVNbB steel, under different loading modes were studied to reveal its complex strengthening mechanisms at high temperature. Based on the experimental observations, dislocation strengthening, precipitation strengthening by M23C6 phase, MX phase, and Cu-rich phase, and subgrain boundary strengthening were the main mechanisms for its excellent fatigue and creep-fatigue properties. In particular, the dynamic process of interaction between phase and dislocation were studied with the help of molecular dynamics method, and the different contributions of hard and soft phases in the studied steel were determined in fatigue and creep-fatigue loading. Based on these phenomena, a physically-based constitutive model was proposed for both fatigue and creep-fatigue (dwell fatigue at elevated temperature) tests considering various micromechanical mechanisms. Three ways for dislocation annihilation were proposed to simulate the dislocation evolution under different loadings. In addition, the effect of Cu-rich phase was modeled by critical breaking angle and dislocation line tension. The capability of the proposed model under different loading modes was verified by comparing cyclic responses, hysteresis loops, stress relaxation, and dislocation density evolution. The proposed model provides an alternative perspective on understanding fatigue and creep-fatigue behaviors of heat resistant martensitic steels owning the similar strengthening mechanisms. © 2023 Elsevier Ltd

Research Area(s)

  • 9Cr3Co3W1CuVNbB steel, Creep-fatigue, High temperature low cycle fatigue, Microstructural strengthening mechanism, Physically-based model

Citation Format(s)

A physically-based constitutive model for a novel heat resistant martensitic steel under different cyclic loading modes: Microstructural strengthening mechanisms. / Song, Kai; Wang, Kaimeng; Zhao, Lei et al.
In: International Journal of Plasticity, Vol. 165, 103611, 06.2023.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review