Microstructural characterisation of stir zone containing residual ferrite in friction stir welded 304 austenitic stainless steel

The characteristics of microstructures in friction stir (FS) weld of 304 austenitic stainless steel were examined. The stir zone (SZ) and thermomechanically affected zone (TMAZ) showed dynamically recrystallized and recovered microstructures, respectively. The hardness of the SZ was higher than that of the base material and the maximum hardness was located in the TMAZ. The higher hardness in TMAZ was attributed to high density of dislocations and sub-boundaries. Electron microscopic observations revealed that ferrite and sigma phases were formed in austenite matrix in the SZ during friction stir welding (FSW).

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Microstructures and Properties of Friction Stir Welded 304 Austenitic Stainless Steel

JOURNAL OF THE JAPAN WELDING SOCIETY ◽

10.2207/qjjws1943.74.138 ◽

2005 ◽

Vol 74 (3) ◽

pp. 138-142 ◽

Cited By ~ 1

Author(s):

Seung Hwan C. PARK ◽

Yutaka S. SATO ◽

Hiroyuki KOKAWA ◽

Kazutaka OKAMOTO ◽

Satoshi HIRANO ◽

...

Keyword(s):

Stainless Steel ◽

Austenitic Stainless Steel ◽

Friction Stir ◽

304 Austenitic Stainless Steel

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Friction stir welding of grain boundary engineered 304 austenitic stainless steel

Proceedings of the 1st International Joint Symposium on Joining and Welding ◽

10.1533/978-1-78242-164-1.407 ◽

2013 ◽

pp. 407-409

Author(s):

S. Tokita ◽

T. Yokoyama ◽

H. Kokawa ◽

Y.S. Sato ◽

H.T. Fujii

Keyword(s):

Stainless Steel ◽

Friction Stir Welding ◽

Austenitic Stainless Steel ◽

Grain Boundary ◽

Friction Stir ◽

304 Austenitic Stainless Steel

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An Assessment on Mechanical and Microstructural Properties of Friction Stir Welded 316 L Austenitic Stainless Steel

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.787.381 ◽

2015 ◽

Vol 787 ◽

pp. 381-385 ◽

Cited By ~ 2

Author(s):

S. Shashi Kumar ◽

N. Murugan ◽

K.K. Ramachandran

Keyword(s):

Stainless Steel ◽

Austenitic Stainless Steel ◽

Microstructural Analysis ◽

Stir Zone ◽

Microstructural Properties ◽

Secondary Phases ◽

Percentage Elongation ◽

Friction Stir ◽

Tool Tilt Angle ◽

Mechanical And Microstructural Properties

The aim of the present study is to investigate on mechanical and microstructural properties of Friction Stir Welded 316 L austenitic stainless steel. Defect free weld were produced at a tool rotational speed (N) of 600 rpm, transverse speed (V) of 45 mm/min, axial force (F) of 11 kN and tool tilt angle (T) of 1.50.Mechanical properties such as Ultimate Tensile strength (UTS), Percentage Elongation (PE), Impact Strength (IS) were evaluated on the welded specimen. Further,micro hardness and microstructural analysis were carried out the transverse direction to the welded specimen. No significance of HAZ in the welded joint with observation of sigma phase precipitation revealed by Groesbeck and Modified Mukrami reagent. Further,FESEM with Electron Dispersive Spectroscopy (EDS) were obtained at the stir zone to ensure constituent of alloying elements present and ensuring no secondary phases found in the stir zone.

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