亚临界热处理对不同Cr/C高铬铸铁的组织与相变的影响
Effects of Sub-critical Treatment on Microstructure and Phase Transformation of High Chromium Cast Iron with Different Cr/C Ratio
张香平, 张 懿, 罗育平, 唐建新
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作者单位：(四川大学 制造科学与工程学院, 四川 成都 610065)
中文关键字：亚临界热处理； Cr/C； 二次碳化物
英文关键字：sub-critical treatment; Cr/C; secondary carbide
中文摘要：研究了不同Cr/C的高铬铸铁经亚临界热处理前后组织与性能的变化规律。结果表明，在亚临界热处理时，Cr/C越高越有利于二次碳化物的析出，越能降低奥氏体的过饱和度，提高Ms点转变温度，在空冷时基体中马氏体含量也就越高，材料的力学性能得到提高，进而提高了材料的耐磨性。
英文摘要：The change rules of microstructure and properties of high chromium cast iron with different Cr/C ratio before and after sub-critical treatment were researched. The results show that, in the process of subcritical treatment, the secondary carbide is precipitated easily with a higher Cr/C ratio; the supersaturation of austenite can be reduced much more; the Ms transition temperature can be increased, and the content of martensite in the matrix is higher in the process of air-cooling, so, the mechanical properties and wear resistance of these materials are both improved.