Friction stir spot welding of single-crystal austenitic stainless steel / J. Jeon in Acta materialia, Vol. 59 N° 20 (Décembre 2011)  

Public ISBD [article]  inActa materialia > Vol. 59 N° 20 (Décembre 2011) . - pp. 7439–7449 Titre : Friction stir spot welding of single-crystal austenitic stainless steel Type de document : texte imprimé Auteurs : J. Jeon, Auteur ; S. Mironov, Auteur ; Y.S. Sato, Auteur Année de publication : 2012 Article en page(s) : pp. 7439–7449 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Friction stir welding Austenitic stainless steel Single crystal Electron backscatter diffraction Recrystallization Résumé : The high-resolution electron backscatter diffraction technique was employed to study the structural response of single-crystal austenitic stainless steel to friction stir spot welding. The strain-induced crystal rotations were found to be governed by simple-shear deformation. In contrast to aluminum alloys, the developed texture showed pronounced {1 1 1}〈1 1 0〉 simple-shear texture components, this effect being attributed to the suppression of cross-slip. Grain boundary development was demonstrated to be closely linked with texture evolution. During pin plunging, at relatively low temperatures, microstructural evolution was shown to be dictated by continuous recrystallization. Due to this process, the single-crystal structure was broken up into an ultrafine-grained polycrystalline aggregate with a mean grain size of ∼0.2 μm. During shoulder contacting, however, the temperature rose and discontinuous recrystallization became predominant. ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645411006501# [article] Friction stir spot welding of single-crystal austenitic stainless steel [texte imprimé] / J. Jeon, Auteur ; S. Mironov, Auteur ; Y.S. Sato, Auteur . - 2012 . - pp. 7439–7449. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 59 N° 20 (Décembre 2011) . - pp. 7439–7449 Mots-clés : Friction stir welding Austenitic stainless steel Single crystal Electron backscatter diffraction Recrystallization Résumé : The high-resolution electron backscatter diffraction technique was employed to study the structural response of single-crystal austenitic stainless steel to friction stir spot welding. The strain-induced crystal rotations were found to be governed by simple-shear deformation. In contrast to aluminum alloys, the developed texture showed pronounced {1 1 1}〈1 1 0〉 simple-shear texture components, this effect being attributed to the suppression of cross-slip. Grain boundary development was demonstrated to be closely linked with texture evolution. During pin plunging, at relatively low temperatures, microstructural evolution was shown to be dictated by continuous recrystallization. Due to this process, the single-crystal structure was broken up into an ultrafine-grained polycrystalline aggregate with a mean grain size of ∼0.2 μm. During shoulder contacting, however, the temperature rose and discontinuous recrystallization became predominant. ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645411006501#

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