Microstructural design strategy to maintain the brittle fracture toughness of hard-soft dual phase steel after cyclic plastic strain
Microstructural design strategy to maintain the brittle fracture toughness of hard-soft dual phase steel after cyclic plastic strain
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DOI：
10.1016/j.matdes.2021.109603
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发表时间：
2021-02-25
影响因子：
8.4
通讯作者：
Okawa, Teppei
中科院分区：
文献类型：
--
作者：
Kosuge, Hiroaki;Kawabata, Tomoya;Okawa, Teppei
当发生大地震或意外的巨浪等自然灾害时，上部结构会因塑性变形而严重损坏。因此，需要开发耐损坏和断裂同时保持一定强度水平的材料。研究了不同铁素体/珠光体两相组织在循环预应变下材料韧性变化的差异。采用晶体塑性理论之一的应变梯度塑性（SGP）理论进行综合分析，并采用常规的宏观材料损伤考虑规则。然后，提出了材料损伤量的变化之间的不同的微观结构。此外，使用SGP理论的参数研究进行建议方向的微观结构设计的钢具有较低的脆性断裂的风险，由于塑性变形。因此，可以提出具有足够强度的耐损伤材料。(c)2021作者由Elsevier Ltd.发布。这是CC BY许可下的开放获取文章（http：//creativecommons.org/licenses/by/4.0/）。
Superstructures are seriously damaged because of plastic deformation when natural disasters, such as large earthquakes or unexpectedly large waves, occur. Therefore, there is a need to develop materials that are resistant to damage and fracture while maintaining a certain level of strength. In this paper, the difference in material toughness changes when cyclic prestrain occurs among different ferrite/pearlite two-phase microstructures were investigated. Synthetic analysis using strain gradient plasticity (SGP) theory, one of the crystal plasticity theories, was carried out, and conventional macroscopic material damage consideration rules were employed. Then, it was suggested that the amount of material damage changes among the different microstructures. In addition, a parametric study using SGP theory is performed to suggest directions for the microstructural design of steel with a lower risk of brittle fracture due to plastic deformation. As a result, damage-resistant materials with sufficient strength can be proposed.(c) 2021 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http:// creativecommons.org/licenses/by/4.0/).