Solid state crack repair by friction stir processing in 304L stainless steel

2018 ◽  
Vol 34 (1) ◽  
pp. 140-147 ◽  
Author(s):  
C. Gunter ◽  
M.P. Miles ◽  
F.C. Liu ◽  
T.W Nelson
Keyword(s):  
Stainless Steel ◽  
Solid State ◽  
Friction Stir Processing ◽  
304L Stainless Steel ◽  
Friction Stir ◽  
Crack Repair

scholarly journals Simulation of Friction Stir Processing in 304L Stainless Steel

2016 ◽  
Vol 80 ◽  
pp. 12001
Author(s):  
M.P. Miles ◽  
T.W. Nelson ◽  
F.C. Liu ◽  
C. Gunter ◽  
L. Fourment
Keyword(s):  
Stainless Steel ◽  
Friction Stir Processing ◽  
304L Stainless Steel ◽  
Friction Stir

A Feasibility Study on Crack Repair in Austenitic Stainless Steel Dry Storage Canisters Using Isothermal Friction Stir Welding

2020 ◽  
Author(s):  
Madhumanti Bhattacharyya ◽  
Indrajit Charit ◽  
Krishnan Raja ◽  
Jens Darsell ◽  
Saumyadeep Jana
Keyword(s):  
Stainless Steel ◽  
Friction Stir Welding ◽  
Spent Nuclear Fuel ◽  
Electrical Discharge Machining ◽  
Stress Profile ◽  
304L Stainless Steel ◽  
Potential Candidate ◽  
Friction Stir ◽  
Dry Storage ◽  
Crack Repair

Abstract In recent time, solid state crack repair techniques in spent nuclear fuel dry storage canisters (SNF-DSC) have garnered significant interest. Plates of austenitic stainless steels are usually arc welded to fabricate the cylindrical canisters which are prone to chloride-induced stress corrosion cracking. Friction stir welding (FSW) is considered to be a potential candidate for damage repair. In this work, electrical discharge machining was used to simulate cracks in 304L stainless steel plates of 12.7 mm thickness. Subsequently, isothermal FSW was carried out at two different temperatures (725 and 825°C) in order to repair the simulated crack. Microstructure-mechanical property correlations in FSWed plates were studied in detail. Significant grain refinement observed in the stir zone (SZ) was attributed to dynamic recrystallization occurring during FSW. A comparison of Vickers microhardness showed higher hardness and homogeneity in the 725°C SZ than its 825°C counterpart. The fraction of Σ3 boundary is found to be low in the SZ as compared to base metal (BM). Yield strength of the joints was found to be approximately 100 MPa higher than that of the BM accompanied by a drop in ductility by a factor of 2. Residual stress profile across 825°C weld was measured using x-ray diffraction.

scholarly journals Friction stir processing of austenitic stainless steel cold spray coating deposited on 304L stainless steel substrate: feasibility study

2021 ◽  
Author(s):  
Thomas Perard ◽  
Alexey Sova ◽  
Hugo Robe ◽  
Vincent Robin ◽  
Yasser Zedan ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Cold Spray ◽  
Friction Stir Processing ◽  
Stainless Steel Substrate ◽  
Steel Substrate ◽  
Spray Coating ◽  
304L Stainless Steel ◽  
Friction Stir ◽  
Cold Spray Coating

Abstract In this work the feasibility test of friction stir processing (FSP) of 1.5 mm thick austenitic stainless steel cold spray coating deposited on 304L stainless steel substrate was performed using tungsten carbide tool. Applied FSP parameters (advance speed 50 mm/min, rotation speed 300 rpm, axial force 20 kN, tilt angle 1.5°) allowed to perform FSP treatment with a higher depth than the coating thickness. As a result, the material mixing at the coating/substrate interface was observed. The microstructure observation revealed that the coating microstructure in the stir zone was significantly modified. EBSD analysis confirmed that full material recrystallization during FSP allowed to formation of dense and uniform fine-grain structure with the mean grain size 1.9 mm. Average coating microhardness was decreased from 406 HV to 299 HV. Further FSP parameters optimization should be carried out in order to improve the process reliability and avoid any coating failure during treatment.

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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