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研究了碳的质量分数低于0.3%、不同硅含量的Mn系贝氏体钢的冲击韧性随回火温度的变化,结果表明,随着Si含量的提高,低温回火阶段出现韧性峰值的温度由220℃提高至340℃,韧性出现低谷的温度由340℃提高至520℃,这与Si抑制碳化物析出、稳定残余奥氏体有关。低Si钢一般适合高温回火后使用,高Si钢一般适合低温回火后使用;但碳的质量分数低于0.08%时,无论Si含量如何,低温或高温回火均适用,若碳含量过高,回火改善韧性的作用不明显。
The results show that with the increase of Si content, the temperature at which the toughness peak appears in the low-temperature tempering stage has been studied. The results show that the toughness of Mn-based bainite steel with different carbon contents is less than 0.3% From 220 ℃ to 340 ℃, the ductile ductility increased from 340 ℃ to 520 ℃, which is related to the inhibition of carbide precipitation and the stabilization of retained austenite. Low Si steel is generally suitable for high temperature tempering, high Si steel generally suitable for low temperature tempering after use; but when the carbon mass fraction of less than 0.08%, regardless of Si content, low temperature or high temperature tempering are applicable, if the carbon content of over High, tempering to improve the toughness of the role is not obvious.