Hydrogen-induced delayed cracking in TRIP-aided lean-alloyed ferritic-austenitic stainless steels
Loading...
Access rights
openAccess
CC BY
© 2017 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/).
URL
Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
This publication is imported from Aalto University research portal.
View publication in the Research portal (opens in new window)
View/Open full text file from the Research portal (opens in new window)
Other link related to publication (opens in new window)
View publication in the Research portal (opens in new window)
View/Open full text file from the Research portal (opens in new window)
Other link related to publication (opens in new window)
Date
2017-06-03
Major/Subject
Mcode
Degree programme
Language
en
Pages
Series
MATERIALS, Volume 10, issue 6
Abstract
Susceptibility of three lean-alloyed ferritic-austenitic stainless steels to hydrogen-induced delayed cracking was examined, concentrating on internal hydrogen contained in the materials after production operations. The aim was to study the role of strain-induced austenite to martensite transformation in the delayed cracking susceptibility. According to the conducted deep drawing tests and constant load tensile testing, the studied materials seem not to be particularly susceptible to delayed cracking. Delayed cracks were only occasionally initiated in two of the materials at high local stress levels. However, if a delayed crack initiated in a highly stressed location, strain-induced martensite transformation decreased the crack arrest tendency of the austenite phase in a duplex microstructure. According to electron microscopy examination and electron backscattering diffraction analysis, the fracture mode was predominantly cleavage, and cracks propagated along the body-centered cubic (BCC) phases ferrite and α'-martensite. The BCC crystal structure enables fast diffusion of hydrogen to the crack tip area. No delayed cracking was observed in the stainless steel that had high austenite stability. Thus, it can be concluded that the presence of α'-martensite increases the hydrogen-induced cracking susceptibility.Description
Keywords
Constant load tensile testing, Deep drawing, Delayed cracking, Ferritic-austenitic stainless steel, Hydrogen, Martensite transformation
Other note
Citation
Papula, S, Sarikka, T, Anttila, S, Talonen, J, Virkkunen, I & Hänninen, H 2017, ' Hydrogen-induced delayed cracking in TRIP-aided lean-alloyed ferritic-austenitic stainless steels ', Materials, vol. 10, no. 6, 613 . https://doi.org/10.3390/ma10060613