低合金亚共析钢的临界温度及最大铁素体转变量的计算  

Calculation of critical temperatures and the maximum volume fraction of ferrite in low alloy hypoeutectoid steel

作　　者：聂亚群 韩利战[1] 顾剑锋[1] 

机构地区：[1]上海交通大学材料科学与工程学院,上海200240

出　　处：《金属热处理》2015年第2期8-12,共5页Heat Treatment of Metals

基　　金："高档数控机床与基础制造装备"重大专项(2012ZX04012011)

摘　　要：利用热力学软件和经验公式计算了CL50D钢和Fe-C二元系的Acm和A3临界温度线,并进行了对比分析。在此基础上,利用杠杆定理计算了过冷奥氏体等温转变获得的铁素体最大转变量。奥氏体等温转变试验结果表明,基于经验公式法预测的Acm和A3临界温度线能够更准确地计算得到CL50D钢中最大铁素体转变量。本文的工作为低合金亚共析钢奥氏体的等温转变动力学研究和铁素体析出量的精确计算提供了一种方法。Thermodynamical calculation and empirical formulas have been investigated to calculate Aem and A3 critical temperatures of CLSOD steel and Fe-C binary system. Based on the calculated results, the lever rule was used to calculate the maximum volume fraction of ferrite during isothermal transformation of undercooled austenite. The isothermal transformation experiment of austenite was carried out to confirm that the Acre and A3 critical temperature calculated by the empirical equations are more appropriate to predict the maximum volume fraction of ferrite of CL50D steel. This work provides a method to study the kinetics of isothermal austenite transformation and to precisely calculate ferrite precipitation in low-alloy hypoeuteetoid steel.

关 键 词：临界温度 杠杆定律 最大铁素体转变量 CL50D钢 

分 类 号：TG142.1[一般工业技术—材料科学与工程]