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Zhou, N., Pettersson, R., Schönning, M. & Lin Peng, R. (2018). Influence of surface grinding on corrosion behavior of ferritic stainless steels in boiling magnesium chloride solution. Materials and corrosion - Werkstoffe und Korrosion
Open this publication in new window or tab >>Influence of surface grinding on corrosion behavior of ferritic stainless steels in boiling magnesium chloride solution
2018 (English)In: Materials and corrosion - Werkstoffe und Korrosion, ISSN 0947-5117, E-ISSN 1521-4176Article 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.

National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-236498 (URN)10.1002/maco.201810206 (DOI)000451781100006 ()2-s2.0-85055888824 (Scopus ID)
Note

QC 20181119

Available from: 2018-10-18 Created: 2018-10-18 Last updated: 2019-03-20Bibliographically approved
Zhou, N., Peng, R. L., Schönning, M. & Pettersson, R. (2017). SCC of 2304 duplex stainless steel-microstructure, residual stress and surface grinding effects. Materials, 10(3), Article ID 221.
Open this publication in new window or tab >>SCC of 2304 duplex stainless steel-microstructure, residual stress and surface grinding effects
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
Keywords
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:nbn:se:kth:diva-207426 (URN)10.3390/ma10030221 (DOI)000400863500004 ()2-s2.0-85015077550 (Scopus ID)
Note

QC 20170524

Available from: 2017-05-24 Created: 2017-05-24 Last updated: 2018-10-19Bibliographically approved
Zhou, N., Peng, R. L. & Pettersson, R. (2017). Surface characterization of austenitic stainless steel 304L after different grinding operations. INTERNATIONAL JOURNAL OF MECHANICAL AND MATERIALS ENGINEERING, 12, Article ID 6.
Open this publication in new window or tab >>Surface characterization of austenitic stainless steel 304L after different grinding operations
2017 (English)In: INTERNATIONAL JOURNAL OF MECHANICAL AND MATERIALS ENGINEERING, ISSN 1823-0334, Vol. 12, article id 6Article in journal (Refereed) Published
Abstract [en]

Background: The austenitic stainless steel 304L is widely used as a structural material for which the finished surface has significant effect on the service performance. A study of the grinding process with regard to the quality of the ground surfaces is therefore interesting from the point of view of both industrial application and scientific research. Method: This work investigates the influence of grinding parameters including abrasive grit size, machine power, and grinding lubrication on the surface integrity of the austenitic stainless steel 304L. The induced normal grinding force, grinding surface temperature, metal removal rate, and surface property changes have been investigated and compared. Results and Conclusion: Using grinding, lubrication significantly enhanced the metal removal rate. Surface defects (deep grooves, smearing, adhesive chips, and indentations), a highly deformed thin surface layer up to a few microns in thickness, and high surface tensile residual stresses parallel to the grinding direction have been observed as the main damage induced by the grinding operations. Surface finish and deformation were found to be improved by using smaller abrasive grits or by using lubrication during grinding. Increasing the machine power increased surface deformation while reducing surface defects. The results obtained can provide a reference for choosing appropriate grinding parameters when machining 304L; and can also help to understand the failure mechanism of ground austenitic stainless steel components during service.

Place, publisher, year, edition, pages
Springer, 2017
Keywords
Austenitic stainless steel 304L, Grinding, Surface characterization, Microstructure, Residual stress
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-203823 (URN)10.1186/s40712-017-0074-6 (DOI)000394390400001 ()
Note

QC 20170324

Available from: 2017-03-24 Created: 2017-03-24 Last updated: 2018-10-19Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-0980-0560

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