多组元硬质合金的热力学研究及其在微观组织控制中的应用

Thermodynamic Study on Multicomponent Cemented Carbides and Its Application in the Control of Microstructure

硬质合金是一种多组元多相材料,其制造过程涉及复杂的热力学和动力学过程。为了给硬质合金的开发提供理论依据,基于建立的热力学数据库CSUTDCC1,将通过CALPHAD计算模拟的结果与其他文献中的实验结果进行了比较,以验证热力学数据库的准确性和热力学计算方法的高效性。同时,为展示热力学计算在硬质合金设计中的应用,包括合金成分、烧结温度和N2气氛控制等的确定,通过热力学计算和实验验证,研究了Cr、V、Ta、Nb、Zr等元素在钴黏结相和M6C碳化物中的饱和溶解度,论述了热力学计算在硬质合金发展中的具体作用。

Cemented carbide is a kind of multicomponent polyphase material,and its manufacturing process involves complex thermodynamic and kinetic processes.In order to provide a theoretical basis for the development of cemented carbide,based on the established thermodynamic database CSUTDCC1,the CALPHAD simulation results were compared with the experimental results in other literatures to verify the accuracy and efficiency of the thermodynamic calculation method.To demonstrate the application of thermodynamic calculation in the design of cemented carbide,including the control of alloy composition,the confirmation of sintering temperature and N2 atmosphere,the saturated solubility of Cr,V,Ta,Nb and Zr in cobalt bonding phase and M6C carbide was studied by thermodynamic calculation and experimental verification.The specific role of thermodynamic calculation in the development of cemented carbide was discussed.