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Micro Fatigue Crack Propagation Behavior in a Duplex Stainless Steel Studied Using In Situ SEM/EBSD Method
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, The Institute of Technology. Sandvik Materials Technology, Sandviken, Sweden.
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, The Institute of Technology.
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, The Institute of Technology.
2014 (English)In: 11TH INTERNATIONAL FATIGUE CONGRESS, PTS 1 AND 2, Trans Tech Publications Inc., 2014, Vol. 891-892, 313-318 p.Conference paper, Published paper (Refereed)
Abstract [en]

Fatigue crack propagation behaviors in a duplex stainless steel have been studied using an in-situ SEM/EBSD fatigue test and a conventional da/dN test. Crack propagation behaviors in grain, effect of Schmid factor, propagation cross the grain or phase boundaries have been discussed. Crack propagation occurs mainly in the grains with a high Schmid factor, but with very small Schmid factor. Crack deflection occurs mainly at the phase boundaries, but crack branching occurs mainly in the grains due to the dislocation slip. In-situ SEM/EBSD fatigue test confirms that crack propagation deflection can lead to a decrease in crack propagation rate. Formation of crack branches can significantly reduce the crack propagation rate, which can cause crack growth retardation in the main crack path in the worst case. The crack branches formed are usually not ideal. They can propagate almost transversely to the main crack direction with a mode II stress intensity factor, SIF, and a rate that is much higher than that of the main crack.

Place, publisher, year, edition, pages
Trans Tech Publications Inc., 2014. Vol. 891-892, 313-318 p.
Series
Advanced Materials Research, ISSN 1022-6680 ; 891-892
Keyword [en]
Fatigue, fatigue crack propagation, in-situ SEM/EBSD, crack branching, crack deflection
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:liu:diva-105333DOI: 10.4028/www.scientific.net/AMR.891-892.313ISI: 000337767700048Scopus ID: 2-s2.0-84898878964OAI: oai:DiVA.org:liu-105333DiVA: diva2:705945
Conference
11th International Fatigue Congress (Fatigue 2014), 2-7 Mars 2014, Melbourne, Australien
Available from: 2014-03-18 Created: 2014-03-18 Last updated: 2016-05-26Bibliographically approved

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Chai, GuocaiPeng, RuJohansson, Sten

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