Abstract
Microstructure evolution and hardness variation in AISI D2 steel were investigated after cryogenic treatment at 173 or 123 K. Statistical analysis using STATGRAPHICS and analysis of variance (ANOVA) were carried out in order to identify the most important process parameters on the variation of hardness. In addition to process parameters such as heating rate, cooling rate, holding time, and tempering temperature, the influence of surface density of carbides as microstructural variable is also included in the statistical analysis. The obtained results indicated equal impacts on the hardness for the as-cooled condition, while for the as-tempered samples, the most significant factor was found to be the tempering temperature. A regression equation taking into account all the critical variables is proposed, and very good approximation to the experimental hardness values was obtained. Precipitation of transition carbides and their influence on the extent of martensite recovery are considered as possible mechanisms responsible for hardness evolution after cryogenic treatment.
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