NDLI: THE EFFECTS OF PROCESSING PARAMETERS ON THE STRUCTURE AND MECHANICAL PROPERTIES OF STRUCTURAL PM STEELS CONTAINING Mn, Cr AND Mo WPŁYW PARAMETRÓW WYTWARZANIA NA STRUKTURĘ I WŁASNOŚCI MECHANICZNE SPIEKANYCH STALI

Content Provider	Semantic Scholar
Copyright Year	2014
Abstract	The effects of processing parameters on the microstructure and mechanical properties of Fe-Mn-CrMo-C PM steels are described. Pre-alloyed Astaloy CrM and Astaloy CrL, low-carbon ferromanganese and graphite powders were used as the starting materials. After pressing in rigid die, the compacts were conventionally and high temperature sintered at 1120 and 1250◦C, respectively. Sintering was carried out for 60 minutes in atmospheres with different H2/N2 ratios. Cooling rate from sintering temperature was 65◦C min−1 (convective cooling). The specimens were subsequently tempered at 200◦C for 60 minutes in air. All specimens were tested for tensile strength (UTS), elongation (A), offset yield strength (R0.2), transverse rupture strength (TRS), impact toughness and apparent surface hardness (HV 30). After mechanical tests the microstructure of Fe-Mn-Cr-Mo-C PM steels was studied by optical microscopy. These investigations have shown that, by sintering in inexpensive and safe nitrogen-rich atmospheres, it is possible to achieve mechanical properties similar to those of specimens sintered in pure hydrogen and hydrogen-rich atmospheres.
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Alternate Webpage(s)	http://journals.pan.pl/Content/89222/PDF/10172+Volume+59+Issue+4-39+paper.pdf.pdf?handler=pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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