UM
Spindle speed in friction surfacing of 316L stainless steel – How it affects the microstructure, hardness and pitting corrosion resistance
D. Guo1; C.T. Kwok1,2; S.L.I. Chan3
2019-03-15
Source PublicationSurface and Coatings Technology
ISSN0257-8972
Volume361Pages:324-341
Abstract

Using friction surfacing (FS), stainless steel 316L coatings were successfully fabricated on 304 substrates. The spindle speed employed in FS was found to have a more significant effect on the microstructure of the coating surface than that in the cross-section. Compared with the as-received 316L consumable rod, hardness improvement was observed in FSed coatings owing to dynamic recrystallization (DRX) during FS. Moreover, the pitting corrosion resistance of the FSed coatings was enhanced by the severe plastic deformation (SPD), which fragmented the micro-sized MnS inclusions in the consumable rod into inconspicuous size after FS. From the immersion test, pits were gathered in {111} grains of the coatings, and the inferior pitting resistance of the {111} grains could be attributed to their lower stacking fault energy. They sustained considerable elastic strain during FS, and generated a higher residual tensile stress that led to pitting. For the coatings fabricated at a moderate spindle speed (1500 rpm), discontinuous DRX became dominant and the recrystallized random orientated grains weakened the {111} texture, resulting in the highest pitting resistance. However, the pitting corrosion resistance improvement induced by the crystallographic effect of different spindle speeds was less prominent comparing with that caused by MnS inclusion fragmentation. Moreover, the advancing side of the FSed coatings was plastically deformed severely, leading to a stronger {111} texture than in other places, which restricted the pitting corrosion resistance enhancement of entire FSed coating.

KeywordAustenitic Stainless Steel Dynamic Recrystallization Friction Surfacing Hardness, Pitting Corrosion
DOIhttps://doi.org/10.1016/j.surfcoat.2019.01.055
URLView the original
Indexed BySCI
Language英语
WOS Research AreaMaterials Science ; Physics
WOS SubjectMaterials Science, Coatings & Films ; Physics, Applied
WOS IDWOS:000459523600038
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Cited Times [WOS]:4   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionUniversity of Macau
Corresponding AuthorC.T. Kwok
Affiliation1.Department of Electromechanical Engineering, University of Macau, Macao
2.Institute of Applied Physics and Materials Engineering, University of Macau, Macao
3.School of Materials Science and Engineering, University of New South Wales, Sydney, Australia
First Author AffilicationUniversity of Macau
Corresponding Author AffilicationUniversity of Macau;  INSTITUTE OF APPLIED PHYSICS AND MATERIALS ENGINEERING
Recommended Citation
GB/T 7714
D. Guo,C.T. Kwok,S.L.I. Chan. Spindle speed in friction surfacing of 316L stainless steel – How it affects the microstructure, hardness and pitting corrosion resistance[J]. Surface and Coatings Technology,2019,361:324-341.
APA D. Guo,C.T. Kwok,&S.L.I. Chan.(2019).Spindle speed in friction surfacing of 316L stainless steel – How it affects the microstructure, hardness and pitting corrosion resistance.Surface and Coatings Technology,361,324-341.
MLA D. Guo,et al."Spindle speed in friction surfacing of 316L stainless steel – How it affects the microstructure, hardness and pitting corrosion resistance".Surface and Coatings Technology 361(2019):324-341.
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