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

Coatings ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 620
Author(s):  
Linlin Pan ◽  
Chi Tat Kwok ◽  
Kin Ho Lo
Keyword(s):  
Stainless Steel ◽  
Friction Stir Processing ◽  
Retained Austenite ◽  
Active Sites ◽  
Martensitic Stainless Steel ◽  
Microstructural Change ◽  
Nacl Solution ◽  
Corrosion Attack ◽  
Chromium Carbides ◽  
Friction Stir

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.

Improving Wear Resistance of AISI 316LN Austenitic Stainless Steel Using Friction Stir Processing

2015 ◽  
Vol 787 ◽  
pp. 421-425
Author(s):  
A. Vignesh ◽  
V.G. Vijay Prakaash ◽  
A.K. Lakshminarayanan
Keyword(s):  
Stainless Steel ◽  
Wear Resistance ◽  
Austenitic Stainless Steel ◽  
Friction Stir Processing ◽  
Sliding Wear ◽  
Dry Sliding Wear ◽  
Friction Stir ◽  
Pin On Disc ◽  
Metal Microstructure ◽  
Equiaxed Grains

An attempt is made to modify the surface metallurgically and enhance the wear resistance of AISI 316LN austenitic stainless steel using friction stir processing. Friction stir welding tools made up of tungsten based alloy with pin and pinless configuration was used. Fine equiaxed grains were observed in the friction stir processed zone irrespective of tool configuration used. Dry sliding wear resistance was evaluated using pin-on-disc wear tester and it is found that, the friction stir processed zone showed superior wear resistance compared to the base metal. Microstructure, micro hardness, and worn surfaces were used to correlate the results obtained.

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