THE INFLUENCE OF C ON THE OXIDATION AND WEAR RESISTANCE OF Fe-Cr-Mn ALLOY AT HIGH TEMPERATURES

A kinetic oxidation test and an isothermal oxidation test of Fe-Cr-Mn alloys containing0.50％ to 2.69％ C were carried out at 800 and 660℃ in atmosphere.A high temperatureabrasive wear test of the alloys was also done in a self-made wear tester.A study of themorphology of the oxide film and the element distribution in the subsurface indicated that:(1) with increasing C content of the alloys the amount of eutectic carbide increased andthe Mu content in the matrix participating in the oxidation process decreased,resultingin an increase of the oxidation resistance of the alloys:(2) The high temperature wearresistance of the alloys was closely related to the bulk hardness of the alloy and theamount of eutectic carbide.The increase in hardness of the alloys increased the hightemperature wear resisance.However,it must be emphasized that the wear resistanteffect of the carbides depends strongly on the support provided by the matrix.