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首页> 外文期刊>Journal of Materials Engineering and Performance >Formation and Morphology of M_7C_3 in Low Cr White Iron Alloyed With Mn and Cu
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Formation and Morphology of M_7C_3 in Low Cr White Iron Alloyed With Mn and Cu

机译：Mn和Cu合金化的低Cr白铁中M_7C_3的形成和形貌

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摘要

The presence of M_7C_3 carbide in white iron enhances its wear resistance because of high hardness. Scanning electron microscopy (SEM) revealed its morphology as a pencil-like hexagonal structure. On the basis of the SEM observations, elemental distribution studies, and differential thermal analysis (DTA) of some heat-treated hypoeutectic white irons alloyed with Cr, Mn, and Cu, it is concluded that M_7C_3 carbides form as a result of attainment of a favorable condition in the liquid phase present at the austenite grain boundaries. Segregation of phosphorus in the intercellular regions and formation of a copper-rich intermetallic is responsible for the formation of this liquid phase. Austenite was found to nucleate first, followed by the nucleation and growth of M_7C_3 carbide in its vicinity, because of rejection of C and Cr during formation of austenite. The rosette structure generally observed is formed from the joining of M_7C_3 carbides by precipitation of secondary carbides.
机译：白铁中M_7C_3碳化物的存在由于其高硬度而提高了其耐磨性。扫描电子显微镜（SEM）显示其形态为铅笔状的六边形结构。根据SEM观察，元素分布研究和一些与Cr，Mn和Cu合金化的经过热处理的亚共晶白铁的差热分析（​​DTA），得出结论，M_7C_3碳化物的形成是由于达到了奥氏体晶界处液相的有利条件。磷在细胞间区域中的偏析和富铜金属间化合物的形成是造成这种液相的原因。发现奥氏体首先成核，然后在其附近成核并生长M_7C_3碳化物，这是因为在奥氏体形成过程中会排斥C和Cr。通常观察到的玫瑰花结结构是由M_7C_3碳化物通过二次碳化物的沉淀而形成的。

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