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Contents of the issue
The Paton Welding Journal, 2018, #11-12, 140-144 pages
Journal The Paton Welding Journal
Publisher International Association «Welding»
ISSN 0957-798X (print)
Issue #11-12, 2018 (November)
Effect of multi-pass friction stir processing on the microstructure and mechanical properties of dual phase steel
T. Küçükömeroğlu1, S.M. Aktarer2, G. İpekoğlu3 and G. Çam3
1Department of Mechanical Engineering, Karadeniz Technical University, Trabzon, Turkey. E-mail: email@example.com
2Department of Automotive Technology, Recep Tayyip Erdogan University,
Rize, Turkey. E-mail: firstname.lastname@example.org
3Department of Mechanical Engineering, Iskenderun Technical University,
31200 İskenderun-Hatay, Turkey. E-mail: email@example.com; firstname.lastname@example.org
Dual phase (DP) steels have been widely used in the automotive industry due to the excellent engineering properties such as high strength and good formability. However, attempts have recently been ongoing to improve their mechanical and formability properties in order to achieve further weight savings. Mechanical and microstructural properties of DP steel can be improved by severe plastic deformation (SPD) techniques without changing their chemical compositions. Among SPD methods, friction stir processing (FSP) is a new method used to enhance the properties of plate and/or sheet types of metals. Therefore, the effect of multi-pass FSP (M-FSP) on the microstructure and mechanical performance of a DP steel (i.e., DP600) was investigated in the current study. M-FSP was applied to dual phase steel at the 4mm steps. FSP resulted in a refined microstructure which brought about a considerable increase in both hardness and strength values. After FSP, islands of martensite as the secondary phase in the microstructure have been broken and disturbed by the rotational pin. The processed region consists of ferrite, bainite and martensite. The hardness value increased from 210 HV0.2 to about 360 HV0.2 after M-FSP. 36 Ref., 1 Table, 4 Figures.
Keywords: friction stir processing, dual-phase steel, fine grained microstructure, mechanical properties
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