【摘要】 渗碳钢中合金元素对渗碳过程中材料表面吸碳能力有很大影响,含有较多非碳化物形成元素Si、Mn的22Si2MnCrNi2Mo渗碳层的碳含量最低,只有0.65%;含有较多碳化物形成元素的35CrMoV渗碳层碳含量最高,可达1.05%。三种渗碳钢冲击磨损试验结果表明:冲击磨损速率随着渗碳表层碳含量的增加先降低后增加,在碳含量0.82%时冲击磨损速率出现低谷。冲击磨损过程中残余奥氏体由于应变诱发马氏体相变需消耗外加能量可降低磨损速率,得出磨损速率与相变能之间呈指数关系。更多还原

【Abstract】 The capacity of absorbing carbon atoms strongly depends on the alloy elements in steels.The carbon content of carburized layer in 22Si2MnCrNi2Mo steel with more non-carbide forming elements,Si,Mn,is only 0.65%,but that in 35CrMoV 1.05%.The results from the impact wear tests indicates that the impact wear rate decreases first and then increases with the increase of carbon content in carburized layers.The minimum of the wear rates occurs in 0.82% C.The deformation-induced-M-transformation of the retained austenite in impact wear process brings about an additional consumption of applied impact energy,which could give a decrease of wear rate of carburized layers.A exponent relationship between impact wear rate and M-transformation energy has been obtained.更多还原