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Influence of Surface Grinding on Corrosion Behaviour of Ferritic Stainless Steels in Boiling Magnesium Chloride Solution
Department of Material Science, Dalarna University, Falun, Sweden; KTH, Stockholm, Sweden.
Jernkontoret, Stockholm; KTH, Stockholm, Sweden.
Corrosion Department, Avesta Research Center, Outokumpu Stainless AB, Avesta, Sweden.
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, Faculty of Science & Engineering.
2018 (English)In: Materials and corrosion - Werkstoffe und Korrosion, ISSN 0947-5117, E-ISSN 1521-4176, Vol. 69, no 11, p. 1560-1571Article in journal (Refereed) Published
Abstract [en]

The influence of grinding operations on surface properties and corrosion behavior of a ferritic stainless steel (FSS), EN 1.4509, has been investigated and limited comparisons also made to the grade EN 1.4622. Surface grinding was performed along the rolling direction of the material. Corrosion tests were conducted in boiling magnesium chloride solution according to ASTM G36; specimens were exposed both without external loading and under four‐point bend loading. The surface topography and cross‐section microstructure before and after exposure were investigated, and residual stresses were measured on selected specimens before and after corrosion tests using X‐ray diffraction. In addition, in situ surface stress measurements were performed to evaluate the actual surface stresses of specimens subject to four‐point bend loading according to ASTM G39. Micro‐pits showing branched morphology initiated from the highly deformed ground surface layer which contained fragmented grains, were observed for all the ground specimens but not those in the as‐delivered condition. Grain boundaries under the surface layer appeared to hinder the corrosion process. No macro‐cracking was found on any specimen after exposure even at high calculated applied loads.

Place, publisher, year, edition, pages
Wiley-VCH Verlagsgesellschaft, 2018. Vol. 69, no 11, p. 1560-1571
Keywords [en]
ferritic stainless steel, grinding, microstructure, pitting, residual stress, stress corrosion cracking
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:liu:diva-152881DOI: 10.1002/maco.201810206ISI: 000451781100006Scopus ID: 2-s2.0-85055888824OAI: oai:DiVA.org:liu-152881DiVA, id: diva2:1265857
Note

Funding agencies: Outokumpu Stainless Research Foundation; Avesta Research Center, Region Dalarna; Region Gavleborg; Lansstyrelsen Gavleborg; Hogskolan Dalarna; Sandviken Kommun; Jernkontoret

Available from: 2018-11-26 Created: 2018-11-26 Last updated: 2018-12-20Bibliographically approved

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Peng, Ru Lin

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