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Recently, many steel researchers have been attempting to develop superfine low-carbon bainitic microstructure; however, the results are not satisfactory. In this paper, we applied a new thermo-mechanical process for achieving low-carbon superfine bainitic structure. By applying the new process, i.e. ausforming at temperatures above Ms followed by austempering at 355 °C, which is below Ms, we successfully...
A novel heat-treatment process, below-Ms austempering, was performed on two low-C high-Si/Al steels, and accordingly the resultant microstructures and mechanical properties were investigated. The results showed that bainitic transformation occurs at isothermal temperatures below Ms and unexpectedly, the transformation process is accelerated significantly by the prior formation of martensite. Furthermore,...
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