Publication detail

Thermomechanical fatigue and damage mechanisms in Sanicro 25 steel

PETRÁŠ, R. ŠKORÍK, V. POLÁK, J.

Original Title

Thermomechanical fatigue and damage mechanisms in Sanicro 25 steel

Type

journal article in Web of Science

Language

English

Original Abstract

Heat resistant austenitic Sanicro 25 steel was subjected to in-phase and out-of-phase thermomechanical fatigue (TMF) loading conditions with different amplitudes of mechanical strain in a wide interval of temperature (250–700 °C). Cyclic hardening/softening curves, cyclic stress-strain curves and fatigue life curves were evaluated for both type of loadings. Scanning electron microscopy combined with FIB cutting and EBSD imaging in longitudinal sections containing cracks revealed the mechanisms responsible for fatigue crack initiation and growth. Fatigue cracks developed rapidly in oxidized grain boundaries during in-phase loading and intergranular crack growth resulted in short fatigue life. Multiple cracks in out-of-phase loading perpendicular to the stress axis have arisen only afterwards oxide layer was formed. The delayed initiation and transgranular growth led to longer fatigue life. The effect of grain boundary oxidation and surface oxide cracking on fatigue life was discussed.

Keywords

Thermomechanical fatigue, Sanicro 25steel, Damage mechanism, FIB cutting, Localized oxidation-cracking

Authors

PETRÁŠ, R.; ŠKORÍK, V.; POLÁK, J.

Released

5. 1. 2016

ISBN

0921-5093

Periodical

Materials Science and Engineering A

Number

650

State

Swiss Confederation

Pages from

52

Pages to

62

Pages count

11

BibTex

@article{BUT129901,
  author="Roman {Petráš} and Viktor {Škorík} and Jaroslav {Polák}",
  title="Thermomechanical fatigue and damage mechanisms in Sanicro 25 steel",
  journal="Materials Science and Engineering A",
  year="2016",
  number="650",
  pages="52--62",
  doi="10.1016/j.msea.2015.10.030",
  issn="0921-5093"
}