Metastable Austenite Phase in Rapidly Quenched Fe-Cr-C Alloys

Point defect concentrations in metastable Fe-C alloys.

Point defect species and concentrations in metastable Fe-C alloys are determined using density functional theory and a constrained free-energy functional. Carbon interstitials dominate unless iron vacancies are in significant excess, whereas excess carbon causes greatly enhanced vacancy concentration. Our predictions are amenable to experimental verification; they provide a baseline for rationa...

Effect of pressure on phase stability in Fe-Cr alloys

Nanoscale Phase Evolution during Continuum Decomposition of Fe-Cr Alloys

The continuum decomposition of the Fe-Cr alloys from initial phase separation to steady-state coarsening with concentrations varying from 25 at % Cr and 30 at % Cr to 33 at % Cr aged at 750 K was studied by utilizing three-dimensional phase-field simulations. The dynamic stages of separation of nanoscale Cr-enriched α' phase were distinguished by the evolution of the volume fraction, particle n...

transformation in metastable Fe - Mn alloys

Metastable Fe-Mn alloys exhibit a non-thermoelastic martensitic transformation which is accompanied by a significant thermal effect (ca. 20 J/g). Among Fe-Mn alloys, the highest value of latent heat was registered in alloys with 17-18 wt. % Mn. In this work we investigate effects of carbon (up to 0.4 wt. %) and cold rolling (5-25% of thickness reduction) on the latent heat and the temperature h...

MAGNETIC PROPERTIES OF RAPIDLY QUENCHED (Nd, Pr)2 (Fe,Co)14B-TYPE ALLOYS

The coercivity Hc; of rapidly quenched Nd-Fe-B is linked to the multiphase structure of the alloys: high coercivities require the suppression of the &Nd solid solution and the exictence of the intergranular Nd-rich phase. In quarternary Pr-Fe-Co-B alloys H,i and the remanence J, depend in the same way on Co content as in the Nd-FeCo-B system. However, compared with rapidly quenched Nd-Co-B samp...