Effects of Carbon Concentration Variation on Primary Austenite Stability of High Chromium Cast Iron

Abstract

The effect of carbon content on primary austenite stability of high chromium white cast iron(15.0wt.%) was investigated by means of optical microscopy(OM) and energy spectrum spectrometry(EDS).The results indicate that with increasing the concentration of carbon,the carbon of solid solution in the primary austenite increased, while the chromium was on the contrary, The increase of carbon content stabilized primary austenite under the condition that no secondary carbides precipitated, however, once secondary carbides precipitated, the stability of primary austenite deteriorated with the increase of carbon contents. 2.63wt.% C was the critical value of the secondary carbides precipitation in high chromium white cast iron(15.0wt.%).

Effects of Heat-Treatment on the Microstructure and Wear Resistance of a High-Chromium Cast Iron for Rolls

“…In addition, the (110) diffraction peak of martensite phase of as-cast specimen is at lowest angle, and it deviates to higher angle after quenching and tempering (Figure 2). This result indicates that the as-cast martensite had higher amount of C and alloyed elements [15], which could explain the large amount of austenite retained in the as-cast specimen. After tempering, some carbides could precipitate from martensite; consequently, the amount of C and alloyed elements decreases; hence the diffraction peak of martensite deviates to higher angle.…”