During vacuum carburizing, coarse reticulated carbides tend to precipitate along grain boundaries due high-carbon-potential conditions. This phenomenon is often one of the main factors in failure conventional gear steels. In this paper, a novel solid-solution carburizing process was proposed achieve nano-carbide formation surface layer, and material thermodynamic calculations were combined stud...

We investigated the effects of austenitizing temperature on microstructure, hardness, and tensile properties case-carburized steel after vacuum carburization at 930 °C then re-austenitization 820–900 followed by oil quenching tempering. The results show that fractures occurred early with increase in temperature, although all carburized specimens showed a similar case hardness 800 HV0.2 depth 1....