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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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T91铁素体耐热钢析出相的优化控制
DOI: 10.3724/SP.J.1037.2013.00178, PP. 1075-1080
Keywords: T91钢,析出相,M23C6,形核率
Abstract:
基于T91钢传统的“正火+回火''热处理制度,在Thermal－Calc软件热力学计算的辅助下,通过在正火与回火热处理间引入850℃等温处理,设计了2种新的热处理制度.研究了3种不同热处理制度下T91钢中析出相的尺寸及分布规律.与传统``正火+回火''处理制度相比,新设计的热处理制度使得钢中M23C6碳化物的尺寸由350nm降至250nm左右,并使MX碳氮化物的数密度有所增加.通过Thermal－Calc模拟计算,M23C6碳化物析出相变的驱动力随着C含量的降低而增加.利用经典晶界形核理论并结合Thermal－Calc计算结果,定量描述了M23C6碳化物形核率与C含量的关系,较好地解释了M23C6碳化物的细化原因.
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