Investigation of Silicon Alloyed Astaloy CrL Mixture Powders by Thermal Analysis

摘要

The usage of steel powders prealloyed with chromium in powder metallurgy (PM) components for high performance applications is steadily increasing. The bainitic-austenitic dual phase steels containing silicon are known to posses high toughness due to the presence of a finely dispersed retained austenite in a carbide free bainitic matrix. The absence of carbides in retained austenite is the effect of silicon on the bainitic transformation. The toughness of such a microstructure is expected to improve the mechanical properties of porous sintered steels. The aim of this preliminary research work was to determined which form of silicon (elemental powder or in the form of SiC) and which composition of commercial prealloyed iron powders Astaloy CrL mechanical alloyed with silicon are influenced temperatures transformation during heating and cooling with the aim to achieved unprecedented combinations of strength and toughness for bainitic ferrite microstructure with fine plates of retained austenite.