为了用新型贝氏体钢替代30CrNi4Mo钢,研究了两种钢在不同热处理后的显微组织、力学性能和多次冲击疲劳性能.结果表明:30CrNi4Mo钢经奥氏体化后空冷和油冷+低温回火处理均具有高的强度和良好的冲击韧度;油冷后随回火温度的提高,组织由回火马氏体+残余奥氏体转变为索氏体,油冷+高温回火后具有良好的强韧性配合,且冲击疲劳总寿命高于空冷和油冷+低温回火的;新型贝氏体钢在水冷、油冷和空冷+低温回火后均具有良好的强韧性配合,空冷+低温回火的冲击疲劳寿命高于水冷、油冷+低温回火的;空冷+低温回火状态下新型贝氏体钢多冲疲劳寿命较高,可替代30CrNi4Mo钢用作抗冲击载荷材料.
To replace 30CrNi4Mo steel with new bainitic steel,the microstructure,mechanical properties and repeated impact fatigue properties of the two steels after different heat treatments were studied.The results show that the 30CrNi4Mo steel had high tensile strength and impact toughness after austenitizing air-cooling or oil-cooling and low temperature tempering.With the increase of tempering temperature,the microstructure transformed to sorbite from tempered martensite and retained austenite after quenching,the strength and toughness matched well after oil-cooling and high temperature tempering,the impact fatigue life was always higher than that after air-cooling or oil-cooling and low temperature.The new bainitic steel had good matching of strength and toughness after quenching or normalizing and low temperature tempering.The impact fatigue life after normalizing and low temperature tempering was longer than that of after quenching and low temperature tempering.The impact fatigue life of the new bainitic steel was long at the state of air-cooling and low temperature tempering,indicating that it could replace with 30CrNi4Mo steel to be used as impact resistant loading material.
参考文献
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