| Summary: | 碩士 === 大同大學 === 材料工程學系(所) === 107 === In the study , 1wt% copper ductile iron (FCD450) is examined in different austempering conditions (300℃-1hr、300℃-5hr、300℃-10hr、360℃-1hr、360℃-5hr、360℃-10hr) for transferring to austempered ductile iron (ADI) respectively. Then analysis of microstructures, mechanical properties,and the mechanism of corrosive wear is made to understand different austempering conditions influence the mechanism of corrosive wear of ADI.
The results of the experiment showed the needle-shaped lower bainite generated in lower austempering temperature (300℃) has higher hardness, lower retained austenite amount, higher carbon content of retained austenite and the wear resistance is better than that in higher austempering temperature(360℃). By increasing austempering time, the retained austenite amount decreases and carbide precipitate increases,and both improve the strength and the wear resistance. The findings of the study have led to the conclusion that ADI is superior to DI, and ADI in the condition of 300℃-10hr has the higest hardness and the best wear resistance.
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