热分析在Fe-B合金深过冷凝固过程中的应用

Application of Thermal Analysis in Solidification Process of Undercooled Fe-B Alloy

摘要:

采用熔融玻璃净化与循环过热相结合的深过冷技术，研究了Fe-B共晶合金熔体的深过冷及超过冷凝固组织与冷却曲线的关系。凝固过程的热分析表明，合金熔体冷却曲线的变化体现了熔体的过冷程度，即通过对冷却曲线特征参量的分析能够直接确定深过冷/超过冷凝固组织的获得，而且过冷度与初生相的形核、分布、晶粒大小及共晶组织形貌等凝固特征的对应关系也能够通过冷却曲线反映出来。

Abstract:

Adopting the undercooling technique combined molten glass denucleating with cyclical superheating, the solidification microstructures of undercooled and hypercooled Fe-B eutectic alloy melts were investigated by the thermal analysis of the cooling curves. The results show that the variations of cooling curves of alloy melts reveal the undercooling extent of melts, i.e. according to the analysis of the characteristic parameters in cooling curves the achievement of undercooled and hypercooled microstructures can be determined directly. And the corresponding relation between the nucleation, distribution, grain size as well as eutectic morphology of the primary phase and the undercooling degree can also be reflected by the cooling curves.