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中碳高合金高强度钢线膨胀测量中奥氏体-铁素体相变过程分析 被引量:7

Analysis of Phase Transformation of Austenite-ferrite in Linear Thermal Expansion Measarement of Medium-Carbon-High-Alloy-High-Strength Steel
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摘要 线膨胀测量是获取钢铁材料固态相变动力学信息的一种重要手段,而从线膨胀测量结果提取相变动力学信息的杠杆法则,不适用于两相或者多相连续析出的过程,因而在计算相变体积分数时会产生很大的系统误差。以中碳高合金高强度钢(MCHAHS)的奥氏体-铁素体相变过程为主要研究对象,通过确定冷却过程中各生成相的晶格常数随温度的变化关系,发展了一种新的由线膨胀量信息提取相变动力学信息的计算方法.从而得到了MCHAHS钢转变过程中铁素体和珠光体体积分数随温度的变化关系,计算结果与验证性实验结果吻合良好。 Linear thermal expansion measurement is one of the most powerful techniques to obtain kinetic information of solid-state phases transformation of steels. However, applying standard lever rule to transformation process with continuously precipitating of two/more phase to obtain kinetic information will cause a great error in caculating transformed volume fraction. In this paper, through analysis of austenite-ferrite transformation in MCHAHS, taking the change of lattice parameters in phases into account, a new method to obtain kinetic information from dilatometric data is establisd. Using this method, ferrite and pearlite volume fractions are caculated with the temperature changes. The result shows the the caculated volume fractions agree well with the result of the experiment.
出处 《材料导报》 EI CAS CSCD 北大核心 2007年第10期125-128,134,共5页 Materials Reports
基金 国家自然科学基金项目(No.50401003) 天津市自然科学基金项目(No.033608811) 全国优秀博士学位论文作者专项基金项目(No.200335) 河南省国际合作项目(No.0546620015)
关键词 铁素体 动力学 线膨胀 杠杆法则 中碳高合金高强度钢 ferrite, kinetics, linear thermal expansion, lever rule, MCHAHS
作者简介 付俊国:男,1982年生,硕士生,主要研究线膨胀测量技术在钢铁材料相变中的应用Tel:022—89468878 刘永长:通讯作者Tel:022-87401873 E-mail:ycliu@tju.edu.cn
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参考文献15

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