Microstructure and Fatigue of Ultrafine‐Grained Ferritic/Martensitic Steel,Advanced Engineering Materials

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Microstructure and Fatigue of Ultrafine‐Grained Ferritic/Martensitic Steel
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2020-03-27 , DOI: 10.1002/adem.202000034
Marina Nikitina ₁ , Rinat Islamgaliev ₁ , Artur Ganeev ₁ , Vil Sitdikov ₁

Affiliation

The impact of equal‐channel angular pressing in combination with additional heat treatment on microstructure and fatigue of ferritic/martensitic steel is investigated. It is shown that the formation of both the ultrafine‐grained (UFG) structure with an average grain size of about 0.8 μm and the enhanced share of boundaries with the coincidence site lattice (CSL) relationships (the CSL boundaries) leads to an increase in the fatigue endurance limit of more than 50% compared with samples after tempering. Dynamic strain aging is found in the fracture zone of the UFG of samples after fatigue tests. The influence of structural parameters on the fatigue endurance limit of the UFG samples is discussed.

中文翻译：

超细晶粒铁素体/马氏体钢的组织和疲劳

研究了等通道角向压制与附加热处理相结合对铁素体/马氏体钢的组织和疲劳的影响。结果表明，平均晶粒尺寸约为0.8μm的超细晶粒（UFG）结构的形成以及与重合位点晶格（CSL）关系（CSL边界）的边界份额的增加都导致了与回火后的样品相比，疲劳耐受极限超过50％。经过疲劳测试后，样品的UFG断裂区域发现了动态应变时效。讨论了结构参数对UFG样品疲劳极限的影响。

更新日期：2020-03-27

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