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....

A high-strength low-carbon construction structural steel was investigated in the laboratory. The various austenite grain sizes were obtained by austenitizing at different temperatures. effect of size on bainite transformation studied dilatometer. results show that microstructure steels mainly includes granular bainite, lath-like and martensite-austenite (M-A). changes from to with increase temp...