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38SiMnVB钢是超高强度新型弹簧钢,大量应用于汽车悬架弹簧上,应用难点是在超高强度下保持较高的塑韧性。重点研究了38SiMnVB弹簧钢回火转变过程中的组织变化和对力学性能的影响。试验结果表明,马氏体的回火转变是时间过程,不同的回火时间对应着马氏体的分解和不同碳化物类型之间的转变,对钢的力学性能和断裂机制产生了明显影响。可通过控制回火温度和时间获得高强度和高韧性,使钢得到强化与韧化。
38SiMnVB steel is a new ultra-high strength steel spring, a large number used in automotive suspension springs, the application of difficulty is to maintain high strength and toughness under high strength. The microstructural changes and mechanical properties of 38SiMnVB spring steel during tempering were investigated. The results show that the tempering transformation of martensite is a time course, and the different tempering time corresponds to the decomposition of martensite and the transformation between different carbide types, which has a significant effect on the mechanical properties and fracture mechanism of steel. By controlling the tempering temperature and time to obtain high strength and high toughness, the steel is strengthened and toughened.