8 research outputs found
Macroregion Size Measurements in Bimodal Titanium Forgings Using Two-Dimensional Autocorrelation Method
Characterization and modeling of the precipitation of the sigma phase in UDIMET 720 and UDIMET 720Li
Modeling of kinetics of isothermal idiomorphic ferrite formation in a medium-carbon vanadium-titanium microalloyed steel
The effects of decarburization annealing on the microstructure and magnetic properties of semiprocessed motor lamination steels
Modeling of kinetics of austenite-to-allotriomorphic ferrite transformation in 0.37C-1.45Mn-0.11V microalloyed steel
On the influence of interactions between phases on the mechanical stability of retained austenite in transformation-induced plasticity multiphase steels
The mechanical stability of dispersed retained austenite, i.e., the resistance of this austenite to mechanically induced martensitic transformation, was characterized at room temperature on two steels which differed by their silicon content. The steels had been heat treated in such a way that each specimen presented the same initial volume fraction of austenite and the same austenite grain size. Nevertheless, depending on the specimen, the retained austenite contained different amounts of carbon and was surrounded by different phases. Measurements of the variation of the volume fraction of untransformed austenite as a function of uniaxial plastic strain revealed that, besides the carbon content of retained austenite, the strength of the other phases surrounding austenite grains also influences the austenite resistance to martensitic transformation. The presence of thermal martensite together with the silicon solid-solution strengthening of the intercritical ferrite matrix can "shield" austenite from the externally applied load. As a consequence, the increase of the mechanical stability of retained austenite is not solely related to the decrease of the M-s temperature induced by carbon enrichment