Interface strengthening and fracture behavior of multilayer TWIP/TRIP steel
Interface strengthening and fracture behavior of multilayer TWIP/TRIP steel
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DOI：
10.1016/j.matchemphys.2018.10.051
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发表时间：
2019-02
影响因子：
4.6
通讯作者：
J. Du;Xianlin Zhang;Bao-xi Liu;Yan-chun Dong;J. Feng;C. Chen;F. Yin
中科院分区：
文献类型：
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作者：
J. Du;Xianlin Zhang;Bao-xi Liu;Yan-chun Dong;J. Feng;C. Chen;F. Yin
采用25%、50%、60%、70%、80%、90%和94%的压下率，在1000 ℃下对TWIP/TRIP系列多层钢进行热轧，通过选择氧化在包层界面处发现了原位反应的al2o3晶须。随着轧制压下率的增加，连续氧化膜或氧化壁被破坏分离成细小分散的增强物，有利于强化界面和增韧多层钢。在低轧制压下，较厚的氧化壁抑制了晶粒的生长和合金元素的扩散，导致界面结合薄弱和界面分层。而在高轧制压下，细小分散的al2o3晶须在复合界面上架起桥梁，引起晶粒交叉，形成强界面和高均匀塑性变形能力。此外，晶粒交叉现象和内部TWIP/TRIP配位变形机制为提高多层钢的断裂伸长率提供了新的途径。
Series of multilayer TWIP/TRIP steels were hot rolled at 1000 °C with different rolling reduction ratios of 25%, 50%, 60%, 70%, 80%, 90% and 94%, and some in-situ reacted Al2O3whiskers were identified at the clad interface based on selection oxidation. The continuous oxidized films or walls were broken and separated into fine dispersed reinforcements with increasing rolling reduction ratio, which are beneficial to strengthen the interface and toughen the multilayer steels. At low rolling reduction ratio, the thick oxidation walls inhibit the grain growth and alloy element diffusion, leading to the weakness of interface bonding and interface delamination. However, at high rolling reduction ratio, the fine dispersed Al2O3whiskers bridge the clad interface and induce grain crossing, resulting into strong interfaces and high uniform plastic deformation capacity. Moreover, the grain crossing phenomenon and inner TWIP/TRIP coordination deformation mechanism provide a novel approach for improving fracture elongation of multilayer steels.