The crystallographic orientation dependence of the transformation induced plasticity (TRIP) in high carbon bainitic steel was studied. 0.6% C-2.0% Si-1% Cr steels were austenitized at two conditions to obtain different size prior-austenite grains. Subsequently, they austempered evolve structure composed mainly ferrite and retained austenite. characteristic this sample is that it has much larger...

The microstructure characterization of tempered nanocrystalline bainitic steel is investigated in the present study. It is found that two types of plastic relaxation, dislocation debris and nanotwin, occurs in the displacive transformation due to relatively low transformation temperature and high carbon content. Because most carbon atoms trap in the dislocation, high dislocation density can be ...

In this paper, a new low-carbon alloy gear steel is designed via Si/Al alloying. The carburizing and austempering, at temperature slightly higher than the martensitic transformation point (Ms) of surface much lower Ms core, for different times, were carried out on newly steel. After heat treatment, series microstructures (superfine bainitic ferrite + retained austenite, superfine martensite aus...

In this work, different heat treatments were performed in order to study two bainite morphologies, granular and lath-like, obtained at cooling rates a low carbon microalloyed steel. For that purpose, advanced crystallographic characterization quantitative metallography using SEM, EBSD TEM carried out. The evolution of the volume percentage, size, aspect ratio, retained austenite percentage crys...

Retained austenite is a key feature used to realize the transformation-induced plasticity in bainitic high strength steels. In this study, authors focused on formation of metastable Fe-0.61C-1.9Si-0.98Mn (mass%) during isothermal heating processes using situ neutron diffraction techniques. Quantitative discussion carbon partitioning enabled by applying an phase fraction analysis considering cry...

The paper focuses on the analysis of initiation and propagation CO 2 corrosion in several samples low-alloy steel with different microstructures using scanning electrochemical microscopy (SECM) other techniques. It is found that rate mode are highly sensitive to microstructure. overall current density much higher more uniformly distributed for tempered martensite structure than having either a ...

The effect of different austenite grain size and different cooling rates on the austenite to ferrite transformation temperature and different ferrite morphologies in one Nb-microalloyed (HSLA) steel has been investigated. Three different austenite grain sizes were selected and cooled at two different cooling rates for obtaining austenite to ferrite transformation temperature. Moreover, samples ...