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共晶转变 [gòng jīng zhuǎn biàn]
eutectic reaction
- 结果表明：锰降低液相线温度和共晶温度，缩小凝固温度范围；锰降低奥氏体向珠光体转变温度，增加碳和铬等元素在奥氏体中的饱和溶解度，从而大大增加奥氏体的稳定性；随锰量的增加，高铬铸铁铸态组织中残余奥氏体量增加，铸态硬度相应下降；但锰对高铬铸铁中的碳化物没有明显的影响。
The results show that: manganese lowers liquidus and eutectic temperature, and narrows down the temperature range of solidification; manganese reduces the transformation temperature from austenite to perlite, and increases the saturation solubility of carbon and chromium in austenite, so remarkably enhances the stability of austenite; With the increase of manganese content, the retained austenite content in as-cast microstructure of cast iron rises and the hardness in as-cast lowers; But Manganese doesn't show obvious effect on carbide.
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