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Surface characterization of austenitic stainless steel 304L after different grinding operations
Dalarna University, School of Technology and Business Studies, Materials Technology. KTH.
Linköping University.
Jernkontoret, KTH.
2017 (English)In: International Journal of Mechanical and Materials Engineering, ISSN 2198-2791, Vol. 12, no 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
2017. Vol. 12, no 6
Keywords [en]
Austenitic stainless steel 304L, Grinding, Surface characterization, Microstructure, Residual stress
National Category
Materials Engineering
Research subject
Steel Forming and Surface Engineering
Identifiers
URN: urn:nbn:se:du-24507DOI: 10.1186/s40712-017-0074-6OAI: oai:DiVA.org:du-24507DiVA, id: diva2:1078923
Available from: 2017-03-07 Created: 2017-03-07 Last updated: 2018-11-14Bibliographically approved
In thesis
1. Surface integrity and corrosion behavior of stainless steels after grinding operations
Open this publication in new window or tab >>Surface integrity and corrosion behavior of stainless steels after grinding operations
2018 (English)Doctoral thesis, comprehensive summary (Other academic)
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.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2018. p. 82
Keywords
stainless steel, stress corrosion cracking, surface integrity, grinding, residual stress
National Category
Materials Engineering
Research subject
Steel Forming and Surface Engineering
Identifiers
urn:nbn:se:du-28894 (URN)978-91-7729-938-7 (ISBN)
Public defence
2018-11-23, Kollegiesalen, Brinellvägen 8, Stockholm, 10:00 (English)
Opponent
Supervisors
Available from: 2018-11-14 Created: 2018-11-14 Last updated: 2018-11-14Bibliographically approved

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