本文主要讨论了55SiMnMo钢在贝氏体转变中出现的一种以马氏体为主的复合结构的形态。该钢在不同奥氏体化温度和连续冷却条件下所得到的“块状”复合结构,由下贝氏体、位错型马氏体和少量奥氏体组成。复合结构的体积百分数随冷却速度的增加而增加,随奥氏体化温度的增加而减少,其体积百分数是可以控制的。本文还讨论了“块状”复合结构对机械性能的影响,在一定的ΔK下,复合结构能有效地阻止疲劳裂纹的扩展。
A study was made of the lump-like composite structure, which is observed to be composed of lower bainite, dislocation martensite and austenite, appearend on the bainite transformation under different austenizing temperatures and continuous cooling conditions in the 55SiMnMo steel. It may be controlled because its volume percentage increases with the increase of cooling rate and decreases with the decrease of austenizing temperature. The effect of it on the mechanical properties of the steel has also been examined. It may retard the propagation of fatigue crack, especially, more effectively with certain lower ΔK. It may also contribute the strength and toughness for the steel owing to its dislocation martensite and lower bainite.
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