Influence of refined hierarchical martensitic microstructures on yield strength and impact toughness of ultra-high strength stainless steel
Influence of refined hierarchical martensitic microstructures on yield strength and impact toughness of ultra-high strength stainless steel
复制标题
DOI：
10.1016/j.jmst.2020.04.001
复制
发表时间：
2020-08-15
影响因子：
10.9
通讯作者：
Yang, Zhiyong
中科院分区：
文献类型：
--
作者：
Luo, Haiwen;Wang, Xiaohui;Yang, Zhiyong
超高强度不锈钢（UHSSS）的分级马氏体特征，包括原奥氏体晶粒、马氏体包、尺寸递减的马氏体块和板条，通过采用不同的热机械工艺进行不同程度的细化，然后仔细表征。分析了它们与屈服强度和冲击韧性的关系。我们得出的结论是，马氏体结构的细化可以导致屈服强度的显着增加，这遵循霍尔-佩奇关系与高角度边界（HAB）定义的效应晶粒尺寸。 UHSSS 的冲击韧性取决于 HAB 和马氏体板条边界处的残余奥氏体 (RA) 晶粒通过应变诱导转变捕获扩展裂纹的频率和能力，其中板条边界处的膜状 RA 晶粒似乎做出了更大的贡献。 (C) 2020 由Elsevier Ltd 代表Journal of Materials Science & Technology 编辑部出版。
The hierarchical martensitic features in ultra-high strength stainless steel (UHSSS), including the prior austenite grains, martensite packets, blocks and laths with the descending size, were refined to various extents by employing different thermomechanical processes and then carefully characterized. Their relation to yield strength and impact toughness was analyzed. We conclude that the refinement of martensitic structures could lead to the significant increase of yield strength, which follows the Hall-Petch relation with the effect grain size defined by high angle boundaries (HABs). Impact toughness of UHSSS depends on the frequency and capability for retained austenite (RA) grains at both HABs and martensite lath boundaries to trap the propagating cracks via strain-induced transformation, in which the film-like RA grains at lath boundaries appear to make the greater contribution. (C) 2020 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.