| 形变诱导铁素体相变热力学机制的探讨分析 |
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| 引用本文： | 王倩,杨忠民,吴春京.形变诱导铁素体相变热力学机制的探讨分析[J].钢铁,2008,43(10):70-0. |
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| 作者姓名： | 王倩 杨忠民 吴春京 |
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| 作者单位： | 1. 北京科技大学材料科学与工程学院， 北京 100083；2. 钢铁研究总院结构材料研究所， 北京 100081 |
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| 基金项目： | 国家高技术研究发展计划(863计划) |
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| 摘 要： | 从热力学角度，对热模拟变形是否会改变顺磁性奥氏体的磁性自由能，为相变发生提供一定的驱动力这个问题进行了模拟研究。试验材料选用室温组织为顺磁性奥氏体的Fe Ni Cr合金，利用X射线衍射仪和振动样品磁强计，测量了不同变形条件下样品的X射线衍射谱线和磁化强度，结果表明：一定条件的变形可以改变顺磁性奥氏体的磁化强度，且随着变形量的增加，磁化强度逐渐减小，磁性自由能随之降低；通过分析磁性自由能降低的原因，从磁性自由能角度，提出了形变诱导铁素体相变的热力学模型修正因子。
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| 关 键 词： | 形变诱导铁素体相变 热力学 γ→α相变 |
Analysis of Thermodynamic Mechanism of Deformation Induced Ferrite Transformation |
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| WANG Qian,YANG Zhong-min,WU Chun-jing.Analysis of Thermodynamic Mechanism of Deformation Induced Ferrite Transformation[J].Iron & Steel,2008,43(10):70-0. |
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| Authors: | WANG Qian YANG Zhong-min WU Chun-jing |
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| Affiliation: | 1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China； 2. Institute for Structure Materials, Central Iron and Steel Research Institute, Beijing 100081, China |
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| Abstract: | The issue whether the deformation of thermal simulation will change the magnetic free energy of paramagnetic austenite providing the driving force for phase change was studied with thermodynamics principle.The Fe Ni Cr alloy of paramagnetic austenite at room temperature was selected. The samples deformed under different conditions were studied by X ray diffraction and vibrating specimen magnetometer (VSM) and the results showed that a certain deformation may change the magnetization of paramagnetic austenite and the magnetization and magnetic free energy reduce gradually with the increase of the strain, The modifying factor of thermodynamic model of DIFT was propesed with consideration of magnetic free energy by analyzing the reason of magnetic free energy drop. |
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| Keywords: | deformation induced ferrite transformation (DIFT) thermodynamics γ→α phase change |
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