FATIGUE CRACK GROWTH IN 316L UNDER UNIAXIAL AND TORSIONAL LOADING

1,2 KAROĽ Michal
Co-authors:
1 CHLUPOVÁ Alice 1 MAZÁNOVÁ Veronika 1 KRUML Tomáš
Institutions:
1 Institute of Physics of Materials AS CR, Brno, Czech Republic, EU, chlupova@ipm.cz
2 Faculty of Sciences, Masaryk University, Brno, Czech Republic, EU, 379823@mail.muni.cz
Conference:
25th Anniversary International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 25th - 27th 2016
Proceedings:
Proceedings 25th Anniversary International Conference on Metallurgy and Materials
Pages:
568-573
ISBN:
978-80-87294-67-3
ISSN:
2694-9296
Published:
14th December 2016
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
69 views / 19 downloads
Abstract

A study of fatigue crack initiation and growth in 316L austenitic stainless steel is reported. Fatigue experiments were performed at room temperature on full cylindrical specimens cycled axially (tension-compression) and on hollow cylindrical specimens tested in reversed torsion. Microstructure and damage evolution (crack initiation and growth) on the surface of mechanically and electrolytically polished specimens were observed using light and electron microscopy. An analysis of the orientation of microcracks and macrocracks which led to failure was made. Axially loaded specimens exhibited presence of several microcracks which resulted in macrocrack propagating perpendicularly to specimen axis. In the case of torsional loading, orientation of macrocrack propagation was dependent on applied load and presence of notches. High amount of short cracks initiated parallel to specimen axis. Long cracks exhibited a tendency to bifurcate with crack branches oriented at approximately 45° to the specimen axis.

Keywords: 316L austenitic steel; surface relief; fatigue; crack orientation; axial and torsional loading;

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