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Phase diagrams in alternative hard materials: Validation of thermodynamic simulation through high temperature x-ray diffraction, differential thermal analysis and microstructural characterization
International Journal of Refractory Metals & Hard Materials ( IF 4.2 ) Pub Date : 2021-02-27 , DOI: 10.1016/j.ijrmhm.2021.105513
M. de Nicolás , L. Pereira , M. Penoy , C. Bertalan , R. Useldinger , L. Llanes , E. Gordo

In this investigation, Ti(C,N)-FeNiCr systems were designed using Thermo-Calc® software. Materials were processed by conventional powder metallurgy, employing different carbon additions to study a wide range of the phase diagram as well as the effect of C in the sintered samples. Specimens were extensively characterised in terms of density, magnetic and mechanical properties, and microstructural features. Simulation approach was validated by means of Differential Thermal Analysis (DTA) and High-Temperature X-Ray Diffraction (HT-XRD), from room temperature up to 1200 °C for each composition, comparing phases obtained for each temperature and composition with predicted ones. Results showed excellent consonance between Thermo-Calc® and XRD phases, except for precipitation of secondary carbides, which appeared in the simulation but not in the sintered samples. Moreover, variation of C content demonstrated to have a direct effect in the microstructural homogenization of the final specimens.



中文翻译:

替代硬质材料中的相图:通过高温X射线衍射,差热分析和微结构表征验证热力学模拟

在这项研究中,使用Thermo-Calc®软件设计了Ti(C,N)-FeNiCr系统。材料通过常规粉末冶金加工,采用不同的碳添加量来研究各种相图以及碳在烧结样品中的作用。样品在密度,磁性和机械性能以及微观结构特征方面得到了广泛的表征。通过差热分析(​​DTA)和高温X射线衍射(HT-XRD)对模拟方法进行了验证,每种成分的室温至1200°C,并将每种温度和成分获得的相与预测的相进行比较。结果表明,除了二次碳化物的析出,Thermo-Calc®和XRD相之间的共振非常好。它出现在模拟中,但未出现在烧结样品中。此外,C含量的变化对最终样品的微观结构均质化具有直接影响。

更新日期:2021-03-07
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