The effect of carbon content in the base metals high-strength steel on microstructure and impact toughness simulated welding focusing a coarse-grained heat-affected zone (CGHAZ) at different heat inputs was systematically investigated by using scanning electron microscopy (SEM) back-scattering diffraction (EBSD). Charpy test confirmed that there an optimal input, which caused CGHAZ to obtain hi...

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...

Micro-alloyed steel components are used in automotive industry for the necessity to make the manufacturing process cycles shorter when compared to conventional steel by eliminating heat treatment cycles, so an important saving of costs and energy can be reached by reducing the number of operations. Microalloying elements like vanadium, niobium or titanium have been added to medium carbon steels...

The T0 temperature in steel is defined as that at which ferrite and austenite of the same chemical composition have identical free energy. The T0 temperature is that below which it is possible for austenite to transform to ferrite of the same chemical composition after allowing for the strain energy due to the displacements associated with the transformation. Bainite is expected below the T0 te...

In general, the strength-to-weight ratio is a marked property of high- strength low-alloy steel. The coiling temperature an important process parameter in control and improvement final microstructure mechanical properties. this work, effect deformation on properties high Ti- V microalloyed HSLA steels were investigated using Gleeble 1500 TM thermomechanical processing simulator. samples austeni...

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...

The demand for new advanced high strength steels (AHSS) has been increasing in the last few decades. A large part of this comes from automotive companies. We have produced a complex-phase (CP) steel with 1200 MPa mechanical resistance and 8% elongation, called CP1200. In paper dilatometric microstructural characterization newly CP1200 is presented. was by making changes to heat treatment alread...

The addition of high-content alloying elements and the unbefitting process make carbide-free bainite steel difficult in industrial production. Thus, we adopted a dynamic continuous cooling for developing high-strength cold-rolled low-alloy bainitic steels this study. influence rates on microstructure mechanical properties was investigated by dilatometry, scanning electron microscopy (SEM), X-ra...