Comparison of Mechanical Properties of Mn-Cr-Mo Steels Sintered in Different Conditions

The present work discussed the development of statistical analysis as a reproducibility assistance method for evaluation of advanced Fe-3%Mn-(Cr)-(Mo)-C sintered steel for high performance structural parts. Factors contributing to the reliability and reproducibility of these structural steels include advanced metal matrix with consistent purity and concentration of chemical constituents, as well as mix homogeneity and processing uniformity. Matrix inhomogeneity was found to play an important role in these materials. In this paper the statistical dependence between properties and processing variables of PM Mn-Cr-Mo steels is presented. The investigations of sintered steels were based on commercial powders: pre-alloyed Hoganas iron powders Astaloy CrM and Astaloy CrL and graphite C-UF. As a manganese donor low-carbon ferromanganese powder was used. Sintering was carried out in different atmospheres at 1120 degrees C and 1250 degrees C. After sintering, investigated steels were subsequently tempered at 200 degrees C for 60 mm in air. The results of statistical analysis show, there is the relationship between mechanical properties versus processing parameters.