The current study reports in situ TEM observations of the growth bainitic ferrite an Fe-0.3C-3Mn-1.5Si-0.15Mo steel held isothermally at 300 °C with a higher spatio-temporal resolution than previous studies. Significant variations were found lengthening rate, highest being excess 30,000 nm.s−1 while more common rates 10–1000 provided quality observations. Both sheaves visible sub units and indi...

TRIP-assisted C-Si-Mn steels are usually subjected to austempering with a preliminary intercritical annealing that is targeted at the multi-phase structure 40–60 vol.% of proeutectoid ferrite. The kinetics and mechanism phase-structural transformations can be impacted due additional alloying steel by strong carbide forming elements, thus necessitating an alternative approach for selection param...

A novel in-situ scanning electron microscope (SEM) characterization technique for observing phase transformation is developed and its results studied compared to well-founded experimental ex-situ methods as well numerical modelling of bainite formation. Phase kinetics are between the SEM, dilatometry test mean field Cellular Automata (CA) models. Microstructural evolution during EBSD CA model r...

The relationship between alloying content, microstructure and properties has been studied for high strength steel weld metals with 7 to 9 wt. % nickel. Neural network modelling suggested that manganese reductions lead to large impact toughness increases and that nickel must be added in a controlled manner with respect to manganese in order toincrease impact toughness. Carbon additions were pred...

We investigated the effects of the additions of Zr and other alloying elements on the mechanical properties and microstructure in Cr-Mo plastic mold steels. The addition of alloying elements changed the microstructure of the normalized samples from the upper bainite to lower bainite due to the increased hardenability. The tempering temperature influenced the strength and hardness values, especi...

Swing arc narrow gap GMA welding experiments were carried out with a Box–Behnken response surface design. Weld metal and heat-affected sizes measured from the joints obtained, an ANOVA was performed to obtain well-fitting models for definition of length. Overlapping patterns microstructures analyzed observed in zones within length through thickness direction. In addition, thermal processes typi...

In-situ time-resolved X-ray diffraction technique with synchrotron radiation was used to track austenite decomposition in steels. Measurements from a Fe-C-Si-Mn steel indicate two lattice parameters in the austenite, possibly due to the development of carbon-rich and carbon-poor austenite prior to transformation. The lattice parameter became uniform with the progress of transformation and the f...