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Effect of TaC Particles Dissolution on Grain Coarsening in Reduced Activation Steels

XIA Zhi-xin , ZHANG Chi , HUANG Qun-ying , LIU Shao-jun , LI Zhao-dong , YANG Zhi-gang

钢铁研究学报(英文版)

The effect of TaC on grains and packets coarsening in the reduced activation ferritic/martensitic (RAFM) steels was investigated. It was found that the combined effect of the austenitizing temperature and heating rate resulted in the heterogeneous austenite grain growth. When the austenitizing temperature was raised above 1423 K, the TaC particles disappeared, and the homogenous grains abruptly increased. The thermodynamic model for dissolution of TaC particles during austenitizing was applied to interpret the results.

关键词: reduced activation steel , TaC precipitation , diffusion , thermodynamic model

Fe-C-Mn-Al系TRIP钢两相区奥氏体转变模拟

钱海帆,张宇光,王炜,张建平

钢铁

为了研究Fe-C-Mn-Al系TRIP钢两相区奥氏体化过程中合金元素在奥氏体和铁素体中的分布,利用热膨胀仪、金相显微镜、电子探针等仪器,在对TRIP钢两相区奥氏体化过程进行热力学与动力学分析的基础上,建立了两相区奥氏体化过程的扩散模型,采用显式有限体积法对800℃与840℃的奥氏体化过程进行了数值求解。模拟结果表明:奥氏体转变初期受C元素在奥氏体中的扩散控制达到亚平衡,奥氏体转变速率较快;此时Al元素在奥氏体与铁素体界面处的浓度差较显著,Mn元素在奥氏体与铁素体界面处的浓度差不显著。奥氏体转变后期受Mn元素在铁素体内的扩散控制,转变速率较慢;此时Al元素在铁素体内已大量富集,Mn元素在奥氏体与铁素体界面处有较显著的浓度差。

关键词: 相变诱导塑性 , intercritical annealing , austenization , kinetics , diffusion , aluminum , manganese , finite element method

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