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SCC of 2304 duplex stainless steel - microstructure, residual stress and surface grinding effects
Högskolan Dalarna, Akademin Industri och samhälle, Materialteknik. KTH.
Linköping University.
Avesta Research Center–Outokumpu Stainlelss AB.
Jernkontoret, KTH.
2017 (engelsk)Inngår i: Materials, ISSN 1996-1944, E-ISSN 1996-1944, Vol. 10, nr 3, artikkel-id 221Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
2017. Vol. 10, nr 3, artikkel-id 221
Emneord [en]
stress corrosion cracking; duplex stainless steel 2304; microstructure; residual stress; grinding
HSV kategori
Forskningsprogram
Stålformning och ytteknik
Identifikatorer
URN: urn:nbn:se:du-24508DOI: 10.3390/ma10030221ISI: 000400863500004PubMedID: 28772582Scopus ID: 2-s2.0-85015077550OAI: oai:DiVA.org:du-24508DiVA, id: diva2:1078929
Tilgjengelig fra: 2017-03-07 Laget: 2017-03-07 Sist oppdatert: 2018-11-14bibliografisk kontrollert
Inngår i avhandling
1. Surface integrity and corrosion behavior of stainless steels after grinding operations
Åpne denne publikasjonen i ny fane eller vindu >>Surface integrity and corrosion behavior of stainless steels after grinding operations
2018 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

Stainless steels are widely used in applications where both the mechanical properties of steels and high corrosion resistance are required. There is continuous research to enable stainless steel components to be produced in a more economical way and be used in more harsh environments. A way to achieve this is to correlate the service performance with the production processes.

The central theme of this thesis is surface integrity and corrosion, especially the stress corrosion cracking behavior, after grinding processes. Controlled grinding parameters, including abrasive grit size, machine power and grinding lubricant, were used and the resulting surface properties studied for austenitic 304L and duplex 2304 stainless steels. The abrasive grit size effect was found to have a larger influence. Surface defects, a highly deformed surface layer and the generation of a high level surface tensile residual stresses along the grinding direction were observed as the main types of damage. 

The effect of grinding on stress corrosion cracking behavior of austenitic 304L, ferritic 4509 and duplex 2304 stainless steels in chloride-containing environments was also investigated.  The abrasive grit size effect on corrosion behavior for the three grades was compared. Grinding-induced surface tensile residual stress was suggested as the main factor to cause micro-cracks on the ground surface for 304L and 2304; for 4509, grinding-induced grain fragmentation was considered as the main factor for the initiation of extensive micro-pits. For duplex 2304, the microstructure and micro-notches in the as-ground surface also had significant influence. Depending on the surface conditions, the actual loading by four-point bending was found to deviate from the calculated value using the formula according to ASTM G39 by different amounts. The knowledge obtained from this work can provide guidance for choosing appropriate stainless steel grades and grinding parameters; and can also be used to help understanding the failure mechanism of ground stainless steel components during service.

sted, utgiver, år, opplag, sider
Stockholm: KTH Royal Institute of Technology, 2018. s. 82
Emneord
stainless steel, stress corrosion cracking, surface integrity, grinding, residual stress
HSV kategori
Forskningsprogram
Stålformning och ytteknik
Identifikatorer
urn:nbn:se:du-28894 (URN)978-91-7729-938-7 (ISBN)
Disputas
2018-11-23, Kollegiesalen, Brinellvägen 8, Stockholm, 10:00 (engelsk)
Opponent
Veileder
Tilgjengelig fra: 2018-11-14 Laget: 2018-11-14 Sist oppdatert: 2018-11-14bibliografisk kontrollert

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