Cr-Ni 亚稳奥氏体基耐磨铸铁结构设计及其性能

Microstructure Design and Properties of Cr-Ni Metastable Austenite Matrix Wear Cast Iron

按已有的金属学理论进行了Ｃｒ－Ｎｉ亚稳奥氏体基耐磨铸铁的合金结构设计。这种新型耐磨铸铁在砂型浇注时，其组织结构为亚稳奥氏体基体加网络状共晶碳化物Ｍ７Ｃ３，基体表面很易摩擦诱发马氏体相变使硬度提高，具有很高的耐磨性。该铸铁的亚稳奥氏体基体在中温区是稳定的，在高温区沉淀析出碳化物Ｍ２３Ｃ６，但因共晶碳化物局部溶解，使奥氏体成分变化不大。因此，该耐磨铸铁也具有良好的耐热性。

The microstructure design of CrNi metastable austenite matrix wear cast iron was accomplished by metallurgical theories The microstructure of this new wear cast iron was austenite matrix with networked eutectic carbide M7C3 by the sand model casting, and the surface hardness was improved because friction induced martensite, and then, the wear resistance of this cast iron was very fine The metastable austenite matrix of this cast iron was relatively stable during middle temperature region, and the carbide M23C6 was precipitated during high temperature region But the change of austenite composition was little because of the partial solvation of eutectic carbide Therefore, this wear cast iron is also of good thermostability