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首页> 外文期刊>ISIJ international >An unusual structure of an as-cast 30 percent Cr alloy white iron
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An unusual structure of an as-cast 30 percent Cr alloy white iron

机译：铸态30％Cr合金白铁的异常结构

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摘要

An unusual microstructure of an as-cast 30 wt percent Cr and 2.26 wt percent C iron has been examined by optical microscopy (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). It was found that the microstructure varied with positions in the cast bar. In the upper part of the cast bar where the cooling rate was faster, the matrix was essentially austenite with some patches of ferrite-plus-precipitat-ed carbides as dendritic regions. Whereas, the central and the lower parts of the cast bar where cooling rates were slower, there was less austenite with greater amount of ferritic zones. The microstructure of core regions at the centre of the dendritic ferrite-plus-precipitated carbides zones contained interconnected carbides that are believed to be the product of a peritectic reaction. TEM examination confirmed that these peritectic carbides were M_7C_3 type. Bainite and martensite were also observed in the transition zones close to the ferrite-plus-precipitated carbides zones. These were believed to result from solid-state decomposition of the dendritic austenite in the later stage of cooling.
机译：已经通过光学显微镜（OM），扫描电子显微镜（SEM）和透射电子显微镜（TEM）检查了铸态的30重量％的Cr和2.26重量％的C铁的异常组织。发现铸锭中的显微组织随位置而变化。在冷却速度较快的铸棒上部，基体基本上是奥氏体，并带有一些铁素体和沉淀碳化物斑片作为树枝状区域。铸钢的中央和下部冷却速度较慢，而奥氏体较少，铁素体区更多。树枝状铁素体加沉淀碳化物区域中心的核心区域的微观结构包含相互连接的碳化物，据信这是包晶反应的产物。 TEM检查证实这些包晶碳化物为M_7C_3型。在靠近铁素体加沉淀碳化物区的过渡区也观察到贝氏体和马氏体。据认为，这是由于在冷却的后期阶段中树枝状奥氏体的固相分解所致。

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