Interlamellar Spacing of Pearlite in a Near-eutectoid Fe–C Alloy Measured by Serial Sectioning
Interlamellar Spacing of Pearlite in a Near-eutectoid Fe–C Alloy Measured by Serial Sectioning
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DOI：
10.2355/isijinternational.49.921
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发表时间：
2009-06
影响因子：
1.8
通讯作者：
Guohong Zhang;M. Enomoto
中科院分区：
文献类型：
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作者：
Guohong Zhang;M. Enomoto
采用连续切片结合扫描电镜和原子力显微镜的方法测量了近共析Fe-0.82mass%C合金在700和680°C等温形成的珠光体片层间距。根据水泥石薄片的水平位移随去除深度的变化，确定了水泥石薄片与金相表面的交角。然后从表面上的表观片层间距计算真实片层间距。当角度较小时，即小于~20°时，直接用原子力显微镜测量。最小和平均真实层间距与其他方法测量的结果吻合良好。从真实层间间距的光谱计算的试样表面上的层间间距的分布，假设随机取向的层状结构是在公平的协议与测量。这是可能的，真正的片层间距的分布主要是由于吸热和最小的真实间距，而不是平均值可能是有关的珠光体转变的热力学理论。
The interlamellar spacings of pearlite formed isothermally at 700 and 680°C in a near-eutectoid Fe–0.82mass%C alloy were measured by serial sectioning coupled with scanning electron and atomic force microscopy. The intersection angle of cememtite lamellae with the metallographic surface was determined from the variation of horizontal displacement of cementite lamellae with removal depth. The true lamellar spacing was then calculated from the apparent lamellar spacing on the surface. When the angle was small, i.e. less than ~20°, it was measured directly by atomic force microscope. The minimum and mean true lamellar spacings are in good agreement with those measured by other methods. The distribution of interlamellar spacings on the specimen surface back calculated from the spectra of true interlamellar spacing assuming the random orientation of cementite lamellae was in fair agreement with the measured one. It is likely that the distribution of true lamellar spacings is primarily due to recalescence and the minimum true spacings rather than the mean value may be relevant to the thermodynamic theory of pearlite transformation.