The kinetics and mechanism of bainite transformation have been studied in Fe-Cr-Mo-V-Ti-C steel high speed dilatometry backed by thermodynamic analysis. The complete transformation of austenite, however, has not occurred at any reported temperature. Obtained results confirm the incomplete reaction phenomenon with the cessation of the bainite transformation well before the paraequilibrium is ach...

Microscopic stress and strain partitioning control the mechanical damage behavior of multiphase steels. Using a combined numerical experimental approach, local distributions deformation localization are characterized in carbide free bainitic steel produced by continuous cooling. The microstructure consists bainite (aggregate ferrite thin film retained austenite), martensite blocky austenite. Nu...

Abstract A new steel chemical composition is combined with a press hardening process, in which die-quenching interrupted by opening the forming tool to permit slow cooling of hot formed part through anisothermal bainitic ferrite transformation. This promotes carbon partitioning austenite before re-closed and resumed near-ambient temperature. The final microstructure predominantly dispersions ma...

Abstract The joining process of bainitic rails is significant in terms their industrialization high-speed and heavy-loaded railways. This paper demonstrates the microstructure changes critical zone welded joint, which responsible for greatest deterioration mechanical properties. Extensive progress decomposition retained austenite ferrite occurs low-temperature heat-affected (LTHAZ) flash-butt j...

The development of ultrafine bainitic structure in AISI 431 stainless steel was the goal of this study. For this purpose, the AISI 431 specimens were austenitized at 1100 °C for 60 min followed by low-temperature austempering treatment at different temperatures and times. Austempered samples were characterized using field emission scanning electron microscopy (FESEM), X-ray diffraction (X...

Abstract Nano-bainitic steels have attracted great attention for good wear resistance. In this research, a medium-carbon low-alloyed steel was austempered at low temperature close to its martensite-start various times obtain mixed microstructure of nano-bainite, martensite and retained austenite. The samples were characterised comprehensively by field-emission SEM quantitative XRD. Its two-body...

Displacive stress and strain induced transformations are those that occur when the formation of martensite or bainitic ferrite is promoted by application strain. These have been shown to be one mechanisms which mechanical properties a microstructure can improved, as they lead better ductility strength transformation plasticity effect. This review aims summarize fundamental knowledge about them,...