循环热处理对Ti-V微合金钢组织和力学性能的影响

发布时间：2018-03-24 14:46

本文选题：金属材料　切入点：循环热处理　出处：《材料研究学报》2015年03期

【摘要】：研究了循环热处理对Ti-V微合金钢组织和力学性能的影响。根据显微组织观察结果对各个循环次数的试验钢晶粒尺寸进行统计和计算,并结合SEM二次电子像揭示了试验钢在循环热处理过程中的组织演变规律,进而解释了晶粒细化机制;对试验钢进行TEM实验,观察了沉淀相粒子的尺寸、成分随循环次数的变化规律。并对不同循环次数下的试验钢进行了室温抗拉强度和冲击韧性实验。结果表明,Ti-V微合金钢的平均晶粒尺寸随着循环次数的增加持续减小(至第7次循环);受复杂碳化物平均尺寸的影响,抗拉强度Rm随着循环次数的增加逐渐降低(自第1次循环开始);而冲击吸收功AKU则因平均晶粒尺寸和先共析铁素体比例的共同影响,随循环次数的增加先升高后降低,并在第3次循环时达到最大。
[Abstract]:The effect of cyclic heat treatment on the microstructure and mechanical properties of Ti-V microalloyed steel was studied. Combined with the SEM secondary electron image, the microstructure evolution of the test steel during cyclic heat treatment was revealed, and the grain refinement mechanism was explained, and the particle size of the precipitated phase was observed by TEM experiment on the test steel. The experimental results of tensile strength and impact toughness at room temperature showed that the average grain size of Ti-V microalloyed steel continued with the increase of cycling times. Decrease (up to the seventh cycle); affected by the average size of complex carbides, The tensile strength R _ m decreases gradually with the increase of cycle times (from the beginning of the first cycle), while the impact absorption energy (AKU) increases first and then decreases with the increase of the average grain size and the ratio of proeutectoid ferrite. The maximum was reached at the third cycle.
【作者单位】：北京科技大学材料科学与工程学院;四川工程职业技术学院;
【分类号】：TG142.1;TG161

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