期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2015.06.034
关键词
Steel; Quenching and partitioning; Mechanical characterization; Fatigue; EBSD; Retained austenite
类别
资金
- Research Fund for Coal and Steel via NewQP project [RFSR-CT-2011-00017]
- governmental institute for the Promotion of Innovation by Science and Technology in Flanders, Belgium (IWT)
- Spanish Ministry of Economy and Competitiveness [RYC-2011-08881]
Despite the significant body of research on mechanical properties of quenched and partitioned (Q&F) steels, their fatigue behavior has not been investigated. This work focuses on the effect of microstructure on high cycle fatigue of Q&P steels and microstructural evolution during cyclic loading. It is demonstrated that increased content of retained austenite (RA) improves fatigue limit of Q&P steels that is related to delay of crack propagation due to austenite-martensite phase transformation. Increasing stress amplitude promotes austenite-martensite phase transformation during cycling loading. It is shown that size and crystallographic orientation of RA are the main factors determining its stability, whereas its shape and spatial distribution do not seem to affect it significantly. Fatigue crack initiation during fatigue testing with high stress amplitudes occurs by intergranular cracking, whereas transgranular cracking controls fatigue crack initiation during cycling loading with lower stress amplitudes. Transgranular crack propagation dominates in the second stage of fatigue at all stress amplitudes. The final stage of fatigue is also not affected by the stress amplitude. It is suggested that fatigue life of Q&P steels can be enhanced via improvement of strength of grain/interphase boundaries. (C) 2015 Elsevier B.V. All rights reserved.
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