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Anantha, Krishnan Hariramabadran
Publications (4 of 4) Show all publications
Anantha, K. H., Örnek, C., Ejnermark, S., Thuvander, A., Medvedeva, A., Sjostrom, J. & Pan, J. (2019). Experimental and modelling study of the effect of tempering on the susceptibility to environment-assisted cracking of AISI 420 martensitic stainless steel. Corrosion Science, 148, 83-93
Open this publication in new window or tab >>Experimental and modelling study of the effect of tempering on the susceptibility to environment-assisted cracking of AISI 420 martensitic stainless steel
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2019 (English)In: Corrosion Science, ISSN 0010-938X, E-ISSN 1879-0496, Vol. 148, p. 83-93Article in journal (Refereed) Published
Abstract [en]

The resistance to environment-assisted cracking (EAC) of AISI 420 martensitic stainless steel (MSS) was investigated in 0.3 M NaCl solution (room temperature) at constant loads for 30 days. The steel tempered at 250 degrees C was superior to the 500 degrees C-temper, which showed corrosion pits favouring cracking. The fracture surface showed faceted grains, cleavage, striations, and inter- and transgranular cracks, suggesting a mixed stress corrosion cracking (SCC) and hydrogen embrittlement (HE) mechanism as the cause for EAC. Finite element modelling (FEM) indicated strain/stress localization at the mouth of deep pits and at the wall of shallow pits, displaying the favoured locations for pit-to-crack transition.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD, 2019
Keywords
Martensitic stainless steel, Residual stress, Tempering, Environment-assisted cracking, Pit-to-crack transition
National Category
Corrosion Engineering
Identifiers
urn:nbn:se:kth:diva-244485 (URN)10.1016/j.corsci.2018.12.010 (DOI)000457950400009 ()2-s2.0-85058373436 (Scopus ID)
Note

QC 20190321

Available from: 2019-03-21 Created: 2019-03-21 Last updated: 2022-10-24Bibliographically approved
Anantha, K. H., Örnek, C., Ejnermark, S., Medvedeva, A., Sjöström, J. & Pan, J. (2017). Correlative Microstructure Analysis and In Situ Corrosion Study of AISI 420 Martensitic Stainless Steel for Plastic Molding Applications. Journal of the Electrochemical Society, 164(4), C85-C93
Open this publication in new window or tab >>Correlative Microstructure Analysis and In Situ Corrosion Study of AISI 420 Martensitic Stainless Steel for Plastic Molding Applications
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2017 (English)In: Journal of the Electrochemical Society, ISSN 0013-4651, E-ISSN 1945-7111, Vol. 164, no 4, p. C85-C93Article in journal (Refereed) Published
Abstract [en]

In this work, the corrosion behavior of tempered AISI 420 martensitic stainless steel (MSS) was studied by in-situ atomic force microscopy (AFM) in 0.1M NaCl and correlated with the microstructure. Thermocalc simulation, dilatometry, and X-ray diffraction (XRD) were performed to investigate phase transformation which showed the formation of M3C, M7C3, and M23C6 type of carbides and also retained austenite. Optical microscopy, scanning electron microscopy (SEM), and AFM characterization revealed undissolved carbides and tempering carbides in the martensitic matrix. Volta potential mapping measured by scanning Kelvin probe force microscopy (SKPFM) indicated higher electrochemical (practical) nobility of the carbides with respect to the martensitic matrix whereas regions adjacent to carbides showed lower nobilities due to chromium depletion. Open circuit potential and cyclic potentiodynamic polarization measurements showed metastable corrosion activities associated with a weak passive behavior and a risk for localized corrosion along certain carbide boundaries. In-situ AFM measurements revealed selective dissolution of certain carbide interphases and martensitic inter-lath regions indicating higher propensity to localized corrosion.

Place, publisher, year, edition, pages
Electrochemical Society, 2017
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-208588 (URN)10.1149/2.0531704jes (DOI)000400958600073 ()2-s2.0-85020244401 (Scopus ID)
Note

QC 20170612

Available from: 2017-06-12 Created: 2017-06-12 Last updated: 2024-03-15Bibliographically approved
Anantha, K. H., Örnek, C., Ejnermark, S., Medvedeva, A., Sjöström, J. & Pan, J. (2017). In situ AFM study of localized corrosion processes of tempered AISI 420 martensitic stainless steel: Effect of secondary hardening. Journal of the Electrochemical Society, 164(13), C810-C818
Open this publication in new window or tab >>In situ AFM study of localized corrosion processes of tempered AISI 420 martensitic stainless steel: Effect of secondary hardening
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2017 (English)In: Journal of the Electrochemical Society, ISSN 0013-4651, E-ISSN 1945-7111, Vol. 164, no 13, p. C810-C818Article in journal (Refereed) Published
Abstract [en]

The effect of secondary hardening of tempered AISI 420 martensitic stainless steel on the corrosion behavior in aqueous 0.01 M NaCl has been studied, in-situ, using atomic force microscopy (AFM) to monitor real-time localized corrosion processes. Scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy, and X-ray diffraction analyses confirmed the presence of undissolved and secondary carbides (Cr23C6, Cr7C3, Cr3C2, Cr3C, Cr2C, and CrC) as well as retained austenite, all finely dispersed in the tempered martensitic matrix. Electrochemical measurements, consisted of monitoring of the open-circuit potential vs. time and cyclic polarization in 0.01 M NaCl solution, were performed to evaluate the passivity and its breakdown, and it was seen that initiation sites for localized corrosion were predominantly peripheral sites of carbides. In-situ AFM measurements revealed that there was a sequence for localized corrosion in which the neighboring matrix next to secondary carbides dissolved first, followed by corrosive attack on regions adjacent to undissolved carbides. Tempering at 500◦C reduced the corrosion resistance and the ability to passivate in comparison to tempering at 250◦C.

Place, publisher, year, edition, pages
Electrochemical Society, 2017
National Category
Corrosion Engineering
Identifiers
urn:nbn:se:kth:diva-218312 (URN)10.1149/2.1261713jes (DOI)000418409800096 ()2-s2.0-85033663829 (Scopus ID)
Note

QC 20171127

Available from: 2017-11-27 Created: 2017-11-27 Last updated: 2024-03-18Bibliographically approved
Hariramabadran Anantha, K., Ejnermark, S., Medvedeva, A., Sjöström, J. & Pan, J. (2016). Corrosion Behavior of a Martensitic Stainless Steel AISI 420 Modified From a Mold Size Point of View. In: : . Paper presented at 10th International Tool Conference.
Open this publication in new window or tab >>Corrosion Behavior of a Martensitic Stainless Steel AISI 420 Modified From a Mold Size Point of View
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2016 (English)Conference paper, Published paper (Refereed)
National Category
Corrosion Engineering
Identifiers
urn:nbn:se:kth:diva-239318 (URN)
Conference
10th International Tool Conference
Note

QC 20181126

Available from: 2018-11-20 Created: 2018-11-20 Last updated: 2024-03-18Bibliographically approved
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