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Effect of Solution Annealing on Fatigue Crack Propagation in the AISI 304L TRIP Steel
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SYSNO ASEP 0544866 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Effect of Solution Annealing on Fatigue Crack Propagation in the AISI 304L TRIP Steel Author(s) Jambor, Michal (UFM-A) ORCID, RID
Vojtek, Tomáš (UFM-A) ORCID
Pokorný, Pavel (UFM-A) ORCID
Šmíd, Miroslav (UFM-A) RID, ORCIDNumber of authors 4 Article number 1331 Source Title Materials. - : MDPI
Roč. 14, č. 6 (2021)Number of pages 13 s. Language eng - English Country CH - Switzerland Keywords solution annealing ; fatigue crack propagation ; martensitic transformation ; crack closure ; 304L steel ; effective threshold ; load shedding Subject RIV JG - Metallurgy OECD category Materials engineering R&D Projects LQ1601 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) GJ19-25591Y GA ČR - Czech Science Foundation (CSF) Method of publishing Open access Institutional support UFM-A - RVO:68081723 UT WOS 000640026900001 EID SCOPUS 85103010943 DOI 10.3390/ma14061331 Annotation 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. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2022 Electronic address https://www.mdpi.com/1996-1944/14/6/1331
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