Effect of substitutional Ni atoms on the Snoek relaxation in ferrite and martensite Fe-C alloys: An atomisitic investigation
Huang, Liangzhao 1Maugis, Philippe1
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作者信息
1. Aix Marseille Univ
折叠
Abstract
Quantitative simulations of the carbon-induced internal friction in ferrite/martensite Fe-C and Fe-Ni-C alloys are performed by combining a mean-field elastic model and the atomistic kinetic Monte Carlo based on a pair interaction model to describe the composition-dependent carbon migration. The simulation is validated by experimental data and a thermo-kinetic theory. Our results predict that (i) additional peaks occur in the internal friction profiles of Fe-C and Fe-Ni-C due to C-C and Ni-C pair interactions; (ii) the Ni-alloying shifts the internal friction peak to lower temperature than in Fe-C alloys; (iii) the peak temperature is not simply related to the most frequent carbon jumps during the relaxation process; (iv) the internal friction behavior in martensite depends on the excitation direction with respect to the carbon ordering direction.
Key words
Anelastic behavior/Internal friction/Carbon steels/Monte Carlo simulation/Mean-field modeling/INTERNAL-FRICTION ANALYSIS/DISLOCATION RELAXATIONS/VIRGIN MARTENSITE/CARBON/DIFFUSION/IRON/NITROGEN/STEEL/STRENGTH
NSTL
Elsevier