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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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低碳钢在ae3以上形变诱导铁素体的形成和性能
Keywords: 金属材料,？拉伸力学性能,？？形变诱导铁素体,？应变速率,？低碳钢
Abstract:
？对低碳钢在ae3以上进行了单道次快速大形变量变形,测定了材料在高温变形前后的室温拉伸曲线并观察其断口形貌。对结果的分析表明,低碳钢在ae3以上的温度发生形变诱导铁素体相变,是形成超细晶粒(3？μm左右)的主要原因。应变速率大于0.1s-1时,可诱导形成铁素体晶粒,且随着应变速率的提高铁素体分数增加而晶粒尺寸减小;当应变速率大于10s-1时铁素体分数达到饱和,晶粒尺寸的变化不大。与先共析铁素体相比,形变诱导铁素体的强度和硬度大大提高,低碳钢q235的屈服强度由250mpa左右提高到510mpa,抗拉强度则达到615mpa,而形变诱导铁素体的塑性有所降低,但仍保持较高的水平。
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