Effects of Mo Content on Microstructure and Properties of Ductile Cast Iron for Air Conditioning Slider
The effects of molybdenum content and isothermal quenching temperature on the microstructure and mechanical properties of carbidic austempered ductile iron were studied.The results show that,with the increase of Mo content,the amount of graphite in the cast nodular cast iron decreases,and the number of pearlite and carbides increases.The morphology of carbides gradually changes from dispersed small block to coarse block or long strip.The microstructure of the isothermal quenched CADI samples with different Mo content are acicular ferrite,spheroidal graphite,carbides and a small amount of retained austenite.When the isothermal quenching temperature is 275℃,with the increase of Mo content,the number of acicular ferrite increases and the content of retained austenite decreases,the impact power at room temperature of CADI increases at first and then decreases,the Rockwell hardness increases gradually,and the average wear rate and wear rate decrease gradually.With the increase of isothermal quenching temperature,the impact power of the CADI sample with 0.43%Mo increases while the Rockwell hardness decreases,and the average wear and wear rate increase.The appropriate Mo content of nodular cast iron for air-conditioning slide is 0.43wt%,and the isothermal quenching temperature is 275℃.
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