Publication detail

Effect of Solution Annealing on Fatigue Crack Propagation in the AISI 304L TRIP Steel

JAMBOR, M. VOJTEK, T. POKORNÝ, P. ŠMÍD, M.

Original Title

Effect of Solution Annealing on Fatigue Crack Propagation in the AISI 304L TRIP Steel

Type

journal article in Web of Science

Language

English

Original Abstract

Fatigue crack propagation in near-threshold regime was studied in the 304L austenitic stainless steel in two microstructural states: as-received (AR) with finer microstructure and low susceptibility to the transformation-induced plasticity (TRIP) effect, and solution-annealed (SA) with coarser microstructure and higher susceptibility to TRIP. At the load ratio R = 0.1 the threshold was higher in the SA state than in the AR state due to coarser grains and possibly the TRIP effect. In order to clarify the role of crack closure, experiments at R = 0.7 were done. The threshold in the SA state was still higher by 1 MPa center dot m(0.5). This effect was identified as crack tip shielding induced by phase transformation, an example of a non-closure shielding effect. Higher resistance to crack growth in the SA state was attributed to promoted martensitic transformation in non-favorable oriented grain families rather than thicker martensite layers in the crack path area. The conclusions were verified by experiments at R = 0.7 and temperature 150 degrees C > M-s which did not reveal any notable difference in thresholds. However, the threshold values were affected by the load-shedding gradient C = -d Delta K/da, which had to be equalized in both experimental setups inside and outside the furnace.

Keywords

solution annealing; fatigue crack propagation; martensitic transformation; crack closure; 304L steel; effective threshold; load shedding

Authors

JAMBOR, M.; VOJTEK, T.; POKORNÝ, P.; ŠMÍD, M.

Released

1. 3. 2021

Publisher

MDPI

Location

BASEL

ISBN

1996-1944

Periodical

Materials

Year of study

14

Number

6

State

Swiss Confederation

Pages from

1

Pages to

13

Pages count

13

URL

https://www.mdpi.com/1996-1944/14/6/1331

Full text in the Digital Library

http://hdl.handle.net/11012/202268

BibTex

@article{BUT172957,
  author="Michal {Jambor} and Tomáš {Vojtek} and Pavel {Pokorný} and Miroslav {Šmíd}",
  title="Effect of Solution Annealing on Fatigue Crack Propagation in the AISI 304L TRIP Steel",
  journal="Materials",
  year="2021",
  volume="14",
  number="6",
  pages="1--13",
  doi="10.3390/ma14061331",
  issn="1996-1944",
  url="https://www.mdpi.com/1996-1944/14/6/1331"
}