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Research Status and Prospect of Friction Stir Processing Technology
Open AccessFeature PaperArticle

Effect of Multiple-Pass Friction Stir Processing on Hardness and Corrosion Resistance of Martensitic Stainless Steel

1
Institute of Applied Physics and Materials Engineering, University of Macau, Macau 999078, China
2
Department of Electromechanical Engineering, University of Macau, Macau 999078, China
*
Author to whom correspondence should be addressed.
Coatings 2019, 9(10), 620; https://doi.org/10.3390/coatings9100620
Received: 28 August 2019 / Revised: 23 September 2019 / Accepted: 24 September 2019 / Published: 27 September 2019
(This article belongs to the Special Issue Recent Advances in Friction Stir Processed Coatings)
In the present study, the influence of multi-pass friction stir processing (FSP) of AISI 420 martensitic stainless steel on the microstructure, hardness, and corrosion behavior was investigated. Similar to single-pass FSPed 420, the multi-pass FSPed specimens with different overlapping ratios incurred microstructural change at the center and retreating side of the second track with martensite, retained austenite, and chromium carbides. Overlapping of the two successive tracks in the multi-pass FSPed 420 led to back-tempering and a local drop in hardness at the advancing side of the second track. The precipitation of chromium carbides in the tempered regions of the multi-pass FSPed specimens became the active sites for preferential corrosion attack in the 3.5 wt.% NaCl solution at 25 °C. View Full-Text
Keywords: friction stir processing; martensitic stainless steel; overlapping; hardness; corrosion friction stir processing; martensitic stainless steel; overlapping; hardness; corrosion
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MDPI and ACS Style

Pan, L.; Kwok, C.T.; Lo, K.H. Effect of Multiple-Pass Friction Stir Processing on Hardness and Corrosion Resistance of Martensitic Stainless Steel. Coatings 2019, 9, 620.

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