Abstract
Application of deep cryogenic treatment instead of conventional heat treatment showed an increase in wear resistance of tools made of high speed steel which are exposed to very complex and demanding conditions in exploitation. The purpose of this study was to investigate the effect of deep cryogenic treatment in combination with plasma nitriding on the tribological properties of powder metallurgy high speed steel, grade PM S390 MC. On treated specimens hardness and fracture toughness was determined, the resistance to intensive adhesive wear (galling) and dry sliding wear (dry sliding wear resistance) were also tested. Test results show that deep cryogenic treatment in combination with plasma nitdriding contributes to better abrasive wear resistance and better galling properties of tested powder metallurgy high speed steel.
Kurzfassung
Die Anwendung von Tieftemperaturbehandlungen anstelle von konventioneller Wärmebehandlungen zeigte einen Anstieg des Verschleißwiderstandes von Werkzeugen aus einem Hochgeschwindigkeitsstahl, die sehr komplexen und anspruchsvollen Bedingungen bei der Rohstoffgewinnung ausgesetzt werden. Das Ziel der diesem Beitrag zugrunde liegenden Studie war es, die Wirkungen von Tieftemperaturbehandlungen in Kombination mit dem Plasmanitrieren auf die tribologischen Eigenschaften des pulvermetallurgischen Hochgeschwindigkeitsstahles PM S390 MC zu untersuchen. Bei den vorbehandelten Proben wurden die Härte und die Bruchzähigkeit gemessen sowie der Widerstand gegen intensiven adhäsiven Verschleiß (Fressverschleiß, engl.: galling) und Trockengleitverschleiß (dry sliding wear) untersucht. Die Versuchsergebnisse zeigten, dass die Tieftemperaturbehandlung in Kombination mit dem Plasmanitrieren zu einem besseren Abrasivverschleißwiderstand und besseren Fressverschleißeigenschaften bei dem geprüften pulvermetallurgischen Hochgeschwindigkeitsstahl führt.
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