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首页> 外文期刊>International Journal Cast Metals Research >The influence of cast structure on the austempering of ductile iron. part 3. the role of nodule count on the kinetics, microstructure and mechanical properties of austempered Mn alloyed ductile iron
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The influence of cast structure on the austempering of ductile iron. part 3. the role of nodule count on the kinetics, microstructure and mechanical properties of austempered Mn alloyed ductile iron

机译：铸件结构对球墨铸铁奥氏体回火的影响。第3部分。根瘤计数对奥氏体锰合金球墨铸铁动力学，微观结构和力学性能的作用

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摘要

Austempering kinetic measurements and mechanical property measurements are reported for irons with different Mn contents and different nodule counts after austenitising at 870℃ and austempering at 375℃. It is shown that increasing nodule count, which reduces segregation and changes the size and distribution of intercellular boundaries, increases the interphase boundary area between graphite and matrix and decreases the continuity of the unreacted austenite in the intercellular boundary. This accelerates the stage I reaction which broadens the heat treatment window and moves it to earlier austempering times. A high nodule count can be used to counter the delay of the stage I reaction caused by Mn additions used to increase the hardenability of the iron. A high nodule count produces a finer, more uniform ausferrite structure that increases the strength, ductility and impact energy of the austempered iron.
机译：报道了在870℃奥氏体化和375℃奥氏体化后，具有不同Mn含量和不同结节数的铁的回火动力学测量和力学性能测量。结果表明，增加根瘤数，减少了偏析，改变了胞间边界的大小和分布，增加了石墨和基体之间的相间边界面积，并降低了未反应奥氏体在胞间边界的连续性。这加速了I阶段反应，从而扩大了热处理范围，并将其移至较早的回火时间。高结节数可用于抵消因添加锰而增加铁的可淬性而导致的I期反应的延迟。较高的根瘤数会产生更细，更均匀的奥氏体组织，从而增加奥氏体铁的强度，延展性和冲击能。

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