低碳Si-Mn系TRIP钢中残余奥氏体量对性能的影响
Effect of Residual Austenite in Low Carbon Si-Mn TRIP Steel on Its Property
何兵兵1, 江 利1, 徐银浩2, 李翠萍2
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作者单位：(1. 中国矿业大学 材料科学与工程学院, 江苏 徐州 221116; 2. 上海重型机器厂, 上海 200245)
中文关键字：残余奥氏体； Si-Mn； TRIP钢
英文关键字：residual austenite; Si-Mn; TRIP steel
中文摘要：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。
英文摘要：The effect of residual austenite in low carbon Si-Mn TRIP steel on its property was researched. The samples were obtained after austenization at 810 ℃for 50 min followed by isothermal quenching at 380 ℃ for 10 min, 20 min, 40 min, 60 min and 120 min respectively. Using X-diffraction analysis, the content of residual austenite is maximum (14.9%) when holding for 20min. And then, the content of residual austenite decreases with the extending of holding time. It reaches minimum (9.9%) when holding for 120 min. The residual austenite is firmed by heat treatment, which makes carbon rich. The higher the content of residual austenite, the better the comprehensive properties of the material.