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材料工程  2013 

奥氏体高温转变区二段冷却速率对铁素体相变的影响

DOI: 10.3969/j.issn.1001-4381.2013.09.003, PP. 11-15

Keywords: 冷却速率,铁素体,相变,超快冷

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Abstract:

采用Gleeble热力模拟机对C-Mn钢热压缩变形后过冷奥氏体高温转变区进行二段冷却速率控制,通过冷却过程中施加微小应变,并根据应力-温度曲线,结合金相组织观察,研究了二段冷却速率对铁素体相变开始温度和相变组织的影响。结果表明在过冷奥氏体高温转变区冷却相同时间,相对于连续冷却,当前段快冷,后段缓冷时,铁素体相变开始温度下降,相变的铁素体体积分数增加;当前段快冷速率为100℃/s时,铁素体相变开始温度下降幅度能达到100℃,铁素体体积分数增加近1倍。因此,应用前置式超快冷,并随后缓冷的冷却方式有助于提高铁素体转变量,并降低铁素体相变的温度,以细化铁素体晶粒。

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