An investigation into the reduction mechanism of temperature-magnetic stress relief based on DO3 crystal

Abstract

This study assesses a novel method proposed by the research group for reducing residual stress through temperature-magnetic stress relief (TMSR). Experimental findings indicate that this approach yields significant reductions in residual stress. Microscopic analysis reveals that following TMSR treatment, the labyrinthine domains within the material diminish while the parallel domains increase, prompting atomic migration and dislocation in regions of elevated stress. Moreover, utilizing density functional theory, this paper investigates the intrinsic strengthening mechanism of TMSR. The findings indicate that the atomic magnetic moment of the Fe3C (DO3) crystal exhibits an approximately increasing trend within a specific temperature range. This observation underscores the thermo-magnetic coupling strengthening effect inherent in the DO3 ferromagnetic crystal, which constitutes a pivotal element in the enhancement effect of TMSR. Furthermore, an examination of changes in the energy band distribution and electronic density of states at varying temperatures sheds light on the underlying cause of fluctuations in the atomic magnetic moment. The research outcomes indicate that upon surpassing a certain temperature threshold, the crystal phase undergoes changes, leading to fluctuations in the atomic magnetic moment. This study contributes novel insights aimed at enhancing comprehension of the TMSR method.

Keywords

• Residual stress
• Temperature-magnetic stress relief
• Magnetic domain
• Dislocation
• Atomic magnetic moment