Influence of refined hierarchical martensitic microstructures on yield strength and impact toughness of ultra-high strength stainless steel
来源期刊:JOURNAL OF MATERIALS SCIENCE TECHNOLOG2020年第16期
论文作者:Haiwen Luo Xiaohui Wang Zhenbao Liu Zhiyong Yang
文章页码:130 - 136
摘 要: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.
Haiwen Luo1,Xiaohui Wang1,2,Zhenbao Liu2,Zhiyong Yang2
1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing2. Division of Special Steels, Central Iron and Steel Research Institute
摘 要: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.
关键词: