轧辊用高C、V含量Fe-5Cr-5Mo-5W-V-C高速钢的凝固过程

SOLIDIFICATION PROCESS OF Fe_5Cr_5Mo_5WVC HIGH SPEED STEEL CONTAINING HIGH CONTENTS OF C AND V

采用热分析和急冷试验的方法，辅以Ｘ射线衍射法、着色金相法及电子探针微区成分分析，对含Ｃ１．０％～４．４％、含Ｖ０％～１１％的Ｆｅ－５Ｃｒ－５Ｗ－５Ｍｏ系高速钢的凝固过程进行了分析，确定各结晶相的种类和结晶温度，建立了Ｃ、Ｖ量与初生相关系的准３元状态图和Ｆｅ－Ｃ、Ｆｅ－Ｖ的准２元状态图，获得了合金成分与凝固组织的关系，为该系列合金的应用提供了理论依据，使根据组织要求而进行合金成分设计成为可能。若要获得大量分散的孤立共晶ＶＣ组织，在Ｃ量低时需较高的Ｖ量，在Ｃ量高时所需的Ｖ量相对降低。

The rapid solidification process of Fe_5Cr_5Mo_5W steel rollers is investigated using thermal analysis, X-ray diffraction and codbaredphase methods respectively. Asinyle FeVC diagram is constructed based on the phases, phases after solidification and the region of crystallizing temperatures. The relationship between the composition and the microstructure is also determined so that it is possible to design the alloy based upon the requirement of microstructures. In order to obtain a large amount of dispersed and isolated eutectic of VC, a high content of V is required for a low carbon content, or a low content of V is required for a high C content.