CrMo钢比热与热扩散系数的热力学估算  

Thermodynamic estimation of specific heat and thermal diffusivity in CrMo steels

作　　者：张增超 徐骏 顾剑锋 Zhang Zengchao;Xu Jun;Gu Jianfeng(Institute of Materials Modification and Modeling,School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学材料科学与工程学院材料改性与数值模拟研究所

出　　处：《金属热处理》2018年第9期203-208,共6页Heat Treatment of Metals

摘　　要：利用热力学亚点阵等模型,构建了Fe-Cr-Mo-C四元合金系中单相组织比热与热扩散系数的计算方法,并对20Cr Mo钢与42Cr Mo钢中奥氏体（fcc）和马氏体（bcc）等微观组织的比热与热扩散系数进行了计算与实测。计算与实测结果具有较好的一致性,由此表明本文计算方法能够较为准确的预测不同碳含量Cr Mo钢材料中奥氏体等微观组织在不同温度条件下的比热和热扩散系数。该方法可以简化比热与热扩散系数的实测工作,为Cr Mo钢零件的热处理（特别是渗碳热处理）数值模拟的开展提供参数保障。Estimation method of specific heat and thermal diffusivity of Fe-Cr-Mo-C system based on sub-lattice model was established,and thermal physical properties of austenite（ fcc） and martensite（ bcc） in 20 Cr Mo steel and 42 Cr Mo steels were calculated and measured. The good coherence between the calculated results and measured data indicates the new method can accurately predict the heat capacity and thermal diffusivity of austenite and martensite of Cr Mo steels under different carbon content and temperature conditions. The new method can simplify the measurement of specific heat and thermal diffusivity,and promote the numerical simulation of heat treatment（ especially carburizing process） in Cr Mo steels.

关 键 词：CR Mo钢 亚点阵模型 比热 热扩散系数 

分 类 号：TG156.1[金属学及工艺—热处理]