Abstract
In the present experimental work, the effects of vanadium additions on the microstructures and mechanical properties of powder metallurgy (PM) steel and microalloyed powder metallurgy (PM) steels were investigated. The microstructures of the PM steel and microalloyed PM steels were characterized by optic microscope, SEM and EDS. Experimental results showed that vanadium microalloyed steels can be produced by PM technology. The addition of vanadium limits grain growth during austenitization prior to air cooling and increases the strength in the sintered conditions. By limiting austenite grain growth, the precipitates result in significant improvement in strength.
Kurzfassung
In den experimentellen Arbeiten für diesen Beitrag wurden die Auswirkungen von Vanadium-Zugaben auf die Mikrostruktur und die mechanischen Eigenschaften von pulvermetallurgischem (PM)-Stahl und mikrolegierten, pulvermetallurgischen (PM)-Stählen untersucht. Die Mikrostruktur der W erkstoffe wurde mittels Lichtmikroskopie, Rasterelektronenmikroskopie und EDS chakarterisiert. Die experimentellen Ergebnisse zeigen, dass mit Vanadium mikrolegierte Stähle mittels Pulvermetallurgie hergestellt werden können. Die Zugabe von Vanadium limitiert das Kornwachstum während der Austenitisierung vor der Abkühlung an Luft und erhöht die Festigkeit im gesinterten Zustand. Durch die Begrenzung des Austenitkornwachstums durch die Ausscheidungen ergeben sich erhebliche Verbesserungen in der Festigkeit.
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