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首页> 外文会议>Powder Metallurgy World Congress amp; Exhibition(Euro PM2004) vol.5: Full Density and Alternative Consolidation; Tools for Improving PM; PM Applications; 20041017-21; Vienna(AT) >An Experimental Investigation of Carbide/Austenite Equilibria in Commercial Tool Steels and High Speed Steels compared against Thermodynamic Calculations
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An Experimental Investigation of Carbide/Austenite Equilibria in Commercial Tool Steels and High Speed Steels compared against Thermodynamic Calculations

机译：与热力学计算比较的商用工具钢和高速钢中碳化物/奥氏体平衡的实验研究

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摘要

Accurate phase diagram and thermodynamic information are essential for the understanding and modelling of microstructure evolution. Within the Swedish centre for computational thermodynamics (CCT) a thermodynamic database specialised for tool steels and high speed steels is under construction. This work utilises available assessments and generates new accurate thermodynamic experimental information for new assessments and modifications. In the present work critical experiments have been performed at 1000 and 1150 degrees Celsius in order to establish the equilibrium conditions in terms of phase fractions and compositions in three chosen commercial alloys. The chemical compositions in respective phase were measured using ASEM with combined WDS and EDS analysis. Volume fraction of carbides were also measured using an image analysis software called MicroGOP. Thermodynamic calculations with previous thermodynamic descriptions all show the same tendency, the distribution of Cr and V between the matrix and the carbides is unsatisfactory, the W and Mo content in the carbides are badly described and the important relative stability between the individual phases is miscalculated. The present database using the Thermo-Calc software shows much better agreement with the new experimental results.
机译：准确的相图和热力学信息对于理解和模拟微观结构演化至关重要。在瑞典计算热力学中心（CCT）内，正在建设专门用于工具钢和高速钢的热力学数据库。这项工作利用可用的评估，并为新的评估和修改生成新的准确的热力学实验信息。在目前的工作中，已经在1000和1150摄氏度下进行了关键实验，以便在三种选择的商用合金中根据相分率和组成建立平衡条件。使用结合了WDS和EDS分析的ASEM测量各相的化学组成。碳化物的体积分数也使用称为MicroGOP的图像分析软件进行了测量。具有先前热力学描述的热力学计算均显示出相同的趋势，基体与碳化物之间的Cr和V分布不令人满意，碳化物中的W和Mo含量描述不佳，并且各相之间的重要相对稳定性计算错误。使用Thermo-Calc软件的当前数据库显示出与新实验结果更好的一致性。

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