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随着奥氏体化温度的升高,该钢以三种不同冷却方式冷却后,钢的冲击韧性均有不同程度的提高。钢强度的变化明显不同:油冷组织(马氏体)是单调下降,空冷组织(马氏体+粒状贝氏+粒状组织)变化不大,堆冷组织(粒状贝氏体+粒状组织)于1050℃奥氏体化时出现峰值。分析表明,上述影响规律是与含钨的M_6C型碳化物于1050℃奥氏体化时基本溶解有关。
As the austenitizing temperature increases, the impact toughness of the steel increases with different degrees after the steel is cooled by three different cooling methods. The changes of steel strength are obviously different: the oil-cooling structure (martensite) decreases monotonically, the air-cooling structure (martensite + granular bainite + granular structure) 1050 ℃ austenite peak. The analysis shows that the above influence law is related to the basic dissolution of M_6C carbides containing tungsten at austenitizing temperature of 1050 ℃.