Cargando…
Effect of Solution Annealing on Fatigue Crack Propagation in the AISI 304L TRIP Steel
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 micro...
Autores principales: | , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2021
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7998464/ https://www.ncbi.nlm.nih.gov/pubmed/33801909 http://dx.doi.org/10.3390/ma14061331 |
_version_ | 1783670558267801600 |
---|---|
author | Jambor, Michal Vojtek, Tomáš Pokorný, Pavel Šmíd, Miroslav |
author_facet | Jambor, Michal Vojtek, Tomáš Pokorný, Pavel Šmíd, Miroslav |
author_sort | Jambor, Michal |
collection | PubMed |
description | 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·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 °C > M(s) which did not reveal any notable difference in thresholds. However, the threshold values were affected by the load-shedding gradient C = −dΔK/da, which had to be equalized in both experimental setups inside and outside the furnace. |
format | Online Article Text |
id | pubmed-7998464 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-79984642021-03-28 Effect of Solution Annealing on Fatigue Crack Propagation in the AISI 304L TRIP Steel Jambor, Michal Vojtek, Tomáš Pokorný, Pavel Šmíd, Miroslav Materials (Basel) Article 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·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 °C > M(s) which did not reveal any notable difference in thresholds. However, the threshold values were affected by the load-shedding gradient C = −dΔK/da, which had to be equalized in both experimental setups inside and outside the furnace. MDPI 2021-03-10 /pmc/articles/PMC7998464/ /pubmed/33801909 http://dx.doi.org/10.3390/ma14061331 Text en © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Jambor, Michal Vojtek, Tomáš Pokorný, Pavel Šmíd, Miroslav Effect of Solution Annealing on Fatigue Crack Propagation in the AISI 304L TRIP Steel |
title | Effect of Solution Annealing on Fatigue Crack Propagation in the AISI 304L TRIP Steel |
title_full | Effect of Solution Annealing on Fatigue Crack Propagation in the AISI 304L TRIP Steel |
title_fullStr | Effect of Solution Annealing on Fatigue Crack Propagation in the AISI 304L TRIP Steel |
title_full_unstemmed | Effect of Solution Annealing on Fatigue Crack Propagation in the AISI 304L TRIP Steel |
title_short | Effect of Solution Annealing on Fatigue Crack Propagation in the AISI 304L TRIP Steel |
title_sort | effect of solution annealing on fatigue crack propagation in the aisi 304l trip steel |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7998464/ https://www.ncbi.nlm.nih.gov/pubmed/33801909 http://dx.doi.org/10.3390/ma14061331 |
work_keys_str_mv | AT jambormichal effectofsolutionannealingonfatiguecrackpropagationintheaisi304ltripsteel AT vojtektomas effectofsolutionannealingonfatiguecrackpropagationintheaisi304ltripsteel AT pokornypavel effectofsolutionannealingonfatiguecrackpropagationintheaisi304ltripsteel AT smidmiroslav effectofsolutionannealingonfatiguecrackpropagationintheaisi304ltripsteel |