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

钢铁研究学报(英文版), 2009, 16(4): 33-38.

^1, , ^2, , ^3,

1.School of Materials Scienee and Engineering, Nanjing University of Science and Technology, Nanjing 210094,Jiangsu, China;School of Materials Science and Engineering, Anhui University of Technology,Ma'anshan 243002, Anhui, China

2.School of Materials Science and Engineering, Anhui University of Technology,Ma'anshan 243002, Anhui, China

3.School of Materials Scienee and Engineering, Nanjing University of Science and Technology, Nanjing 210094,Jiangsu, China

基金项目: Key Project on Natural Science for the Education Department of Anhui Province(2006KJ080A)

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

HOU Qing-yu ^1, , HUANG Zhen-yi ^2, , WANG Jing-tao ^3,

1.School of Materials Scienee and Engineering, Nanjing University of Science and Technology, Nanjing 210094,Jiangsu, China;School of Materials Science and Engineering, Anhui University of Technology,Ma'anshan 243002, Anhui, China

2.School of Materials Science and Engineering, Anhui University of Technology,Ma'anshan 243002, Anhui, China

3.School of Materials Scienee and Engineering, Nanjing University of Science and Technology, Nanjing 210094,Jiangsu, China

Keywords： high chromium white cast iron

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.

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