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SCC of 2304 duplex stainless steel-microstructure, residual stress and surface grinding effects
KTH, School of Chemical Science and Engineering (CHE), Chemistry. Dalarna University, Sweden.
KTH, School of Chemical Science and Engineering (CHE), Chemistry.ORCID iD: 0000-0002-0980-0560
2017 (English)In: Materials, ISSN 1996-1944, E-ISSN 1996-1944, Vol. 10, no 3, article id 221Article in journal (Refereed) Published
Abstract [en]

The influence of surface grinding and microstructure on chloride induced stress corrosion cracking (SCC) behavior of 2304 duplex stainless steel has been investigated. Grinding operations were performed both parallel and perpendicular to the rolling direction of the material. SCC tests were conducted in boiling magnesium chloride according to ASTM G36; specimens were exposed both without external loading and with varied levels of four-point bend loading. Residual stresses were measured on selected specimens before and after exposure using the X-ray diffraction technique. In addition, in-situ surface stress measurements subjected to four-point bend loading were performed to evaluate the deviation between the actual applied loading and the calculated values according to ASTM G39. Micro-cracks, initiated by grinding induced surface tensile residual stresses, were observed for all the ground specimens but not on the as-delivered surfaces. Loading transverse to the rolling direction of the material increased the susceptibility to chloride induced SCC. Grinding induced tensile residual stresses and micro-notches in the as-ground surface topography were also detrimental.

Place, publisher, year, edition, pages
MDPI AG , 2017. Vol. 10, no 3, article id 221
Keywords [en]
Duplex stainless steel 2304, Grinding, Microstructure, Residual stress, Stress corrosion cracking, Chlorine compounds, Corrosion, Cracks, Grinding (machining), Residual stresses, Stress analysis, Surface topography, X ray diffraction, Calculated values, Duplex stainless steel, Grinding operations, Magnesium chlorides, Rolling direction, Surface stress measurement, Tensile residual stress, X-ray diffraction techniques, Stainless steel
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-207426DOI: 10.3390/ma10030221ISI: 000400863500004Scopus ID: 2-s2.0-85015077550OAI: oai:DiVA.org:kth-207426DiVA, id: diva2:1098533
Note

QC 20170524

Available from: 2017-05-24 Created: 2017-05-24 Last updated: 2017-11-29Bibliographically approved

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