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研究了低碳Si-Mn系TRIP钢中残余奥氏体量对性能的影响。实验钢经810℃加热保温50 min,在380℃的盐浴炉中分别等温10、20、40、60和120 min,等温后油冷至室温。通过X衍射分析,残余奥氏体的体积分数在等温20 min时达到最大值,为14.9%,而后又随等温时间的延长逐渐减少,在等温120 min时达到最小值,为9.9%。热处理使奥氏体中的碳元素富集,稳定了残余奥氏体,残余奥氏体体积分数越高,材料的综合性能越好。
The effect of retained austenite on the properties of low carbon Si-Mn TRIP steels was studied. The experimental steel was heated at 810 ℃ for 50 min and was isothermally heated in a salt bath at 380 ℃ for 10, 20, 40, 60 and 120 min, respectively. After the isothermal, the oil was cooled to room temperature. The X-ray diffraction analysis showed that the volume fraction of retained austenite reaches the maximum value of 14.9% at isothermal 20 min, then decreases gradually with isothermal time, reaching the minimum of 9.9% at isothermal temperature of 120 min. The heat treatment enriches carbon in austenite and stabilizes the retained austenite. The higher the volume fraction of retained austenite, the better the overall performance of the material.