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Surface Profile Evolution adn Fatigue Crack Initiation in Sanicro 25 Steel at Room Temperature
Institute of Physics of Materials, Academy of Sciences of Czech Republic, Brno.
Institute of Physics of Materials, Academy of Sciences of the Czech Republic, Brno.
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, Faculty of Science & Engineering.
Institute of Physics of Materials, Academy of Sciences of the Czech Republic, Brno.
2016 (English)In: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 658, 221-228 p.Article in journal (Refereed) Published
Abstract [en]

Evolution of the surface profile in room temperature cyclic loading has been studied in high alloy austenitic Sanicro 25 stainless steel. The localization of the cyclic plastic strain into persistent slip bands in the volume of the material leads to the formation of the specific surface relief in the form of persistent slip markings (PSMs) consisting of extrusions and intrusions. Evolution of the shape of PSMs was studied during interruption of cycling using SEM and FIB techniques. Three-dimensional information about the PSMs profiles was obtained. The profiles of both extrusions and intrusions and their evolution during cyclic loading were assessed. Generally extrusions grow, intrusions deepen and fatigue cracks initiate from the tip of the deepest intrusions. The experimental observations were compared and discussed in relation to existing physical models of surface relief formation and fatigue crack initiation.

Place, publisher, year, edition, pages
2016. Vol. 658, 221-228 p.
Keyword [en]
Sanicro 25 steel, Fatigue crack initiation, Persistent slip markings, Extrusions, Intrusions
National Category
Other Materials Engineering
URN: urn:nbn:se:liu:diva-125119DOI: 10.1016/j.msea.2016.02.016ISI: 000372560800025OAI: diva2:902892

Funding agencies: European Regional Development Fund [CZ.1.05/1.1.00/02.0068]; Ministry of Education, Youth and Sports of the Czech Republic [CZ.1.07/2.3.00/30.0063]; GACR [RVO: 68081723, 13-23652S]

Available from: 2016-02-12 Created: 2016-02-12 Last updated: 2016-08-19

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Chai, Guocai
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