Acceleration of diffusional transformation in a high-carbon steel layer composed of a sandwich-like clad steel sheet
Acceleration of diffusional transformation in a high-carbon steel layer composed of a sandwich-like clad steel sheet
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DOI：
10.1016/j.msea.2019.138217
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发表时间：
2019-07
期刊：
影响因子：
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通讯作者：
R. Ueji;T. Inoue
中科院分区：
文献类型：
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作者：
R. Ueji;T. Inoue
本文研究了奥氏体单相条件下两个不同碳含量区域在冷却过程中的热力交互作用。制备了0.05%C低碳钢板夹0.65%C高碳钢板的层状结构复合钢。这种包层结构对于本研究的益处在于，可以在两个组成层中具有恒定碳含量的情况下人工制造组成层的任何部分。在实验中，通过在900 °C下进行平面应变压缩以用于焊接，然后进行气体淬火来制备包覆板。显微组织观察表明，在高碳钢层中的马氏体组织的分数减少，或者，珠光体组织演变为低碳钢层的分数增加，而低碳钢层显示铁素体和珠光体组织与任何结构的复合钢。因此，在具有较高比例的低碳钢层的板中，高碳钢层的硬度降低。这种变化的原因是由于低碳层中的相变引起的高碳钢层的弹性应变和塑性变形。
The thermomechanical interactions between two different regions with different carbon contents during cooling from the austenite single phase condition was studied with a sandwich-like clad sheet. The clad steel with a layered structure where a 0.65%C high-carbon steel sheet was sandwiched by 0.05%C low-carbon steel sheets was prepared. The benefit of this clad structure for this study is that any fraction of the composed layers can be fabricated artificially with the constant carbon content in both component layers. In the experiments, the clad sheets were prepared by plain strain compression at 900 °C for welding, followed by gas quenching. The microstructural observation revealed that the fraction of the martensite structure in the high-carbon steel layer decreased and, alternatively, a pearlite structure evolved as the fraction of the low-carbon steel layers was increased; whereas the low-carbon steel layers showed ferrite and pearlite structures with any construction of the clad steel. Consequently, the hardness of the high-carbon steel layer decreased in the sheet with the higher fraction of low-carbon steel layers. The reason for this change is due to both the elastic strain and the plastic deformation of the high-carbon steel layer induced by phase transformation in the low-carbon layers.