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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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超快速冷却条件下亚共析钢中纳米级渗碳体析出的相变驱动力计算
DOI: 10.3724/SP.J.1037.2012.00372, PP. 26-34
Keywords: 纳米级渗碳体,超快速冷却,过冷奥氏体,热力学模型,相变驱动力
Abstract:
根据KRC和LFG模型提出的Fe-C合金的奥氏体相变机制,系统地计算了过冷奥氏体的相变驱动力,从热力学的角度分析了过冷奥氏体分解生成纳米级渗碳体颗粒的可能性,并且在热轧后超快速冷却的条件下,发现热轧亚共析钢的组织中存在大量纳米级渗碳体弥散分布的区域,渗碳体的尺寸在十到几十纳米,实现了在无微合金元素添加的条件下渗碳体的纳米级析出.此外,在过冷奥氏体组织中先共析铁素体附近存在大量的富C区,根据平衡浓度计算,局部C的摩尔分数可达到0.04-0.08,这部分高浓度的奥氏体分解析出纳米级渗碳体的倾向性更大.
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