材料期刊网

Application of Rietveld Refinement to Investigate the High Chromium White Cast Iron Austempered at Different Temperatures

HOU Qingyu , HUANG Zhenyi , WANG Jingtao

钢铁研究学报(英文版)

The effect of austempering temperature on the microstructure and properties of a high chromium white cast iron was investigated with the Rietveld refinement method. The result shows that the upper bainite exists in the sample austempered at 623 K and the martensite, lower bainite, M7C3, and retained austenite exist in the samples austempered at 563 K and 593 K. The relative content of the retained austenite increases with increasing the austempering temperature from 563 K to 623 K. The higher hardness, impact toughness and impact abrasive wear resistance can be obtained for the specimen austempered at 593 K.

关键词: high chromium white cast iron;austempering;retained austenite;Rietveld refinement;microstructure;properties