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采用电子探针、X射线衍射、磁性法和硬度测量等方法研究了两种不同含锰量高铬铸铁的凝固组织和在亚临界处理过程中的硬化行为。结果表明 ,含锰量分别为 2 6 8%和 1 98%的两种高铬铸铁的凝固组织都由奥氏体、马氏体和M7C3型碳化物组成。二者的共晶碳化物数量相当 ,前者和后者的奥氏体和马氏体含量分别为6 6 2 %、1 3%和 1 1 8%、6 8 2 %。在亚临界处理中 ,高铬铸铁出现二次硬化 ,且前者的二次硬化更明显。这一现象归因于高铬铸铁在亚临界处理过程中所发生的马氏体相变
The solidification microstructure of two kinds of high chromium cast iron with different Mn content and the hardening behavior during subcritical treatment were studied by means of electron probe, X-ray diffraction, magnetic method and hardness measurement. The results show that the solidified microstructures of two high chromium cast irons containing 26.8% and 98% Mn are composed of austenite, martensite and M7C3 carbides respectively. The amounts of eutectic carbides in the two are quite similar, with the former and latter being respectively 6 6 2%, 13% and 18 1% and 68 2%. In subcritical treatment, high chromium cast iron appears secondary hardening, and the former secondary hardening is more obvious. This phenomenon is attributed to the martensitic transformation of high chromium cast iron during subcritical treatment