Rapid formation of the sigma phase in 304 stainless steel during friction stir welding

Park, Seung Hwan C.; Sato, Yutaka; Kokawa, Hiroyuki; Okamoto, K.; Hirano, Shinji; Inagaki, Masahisa

doi:10.1016/j.scriptamat.2003.08.022

Cited by 250 publications

(118 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It is important to consider that the weld metal analyzed by these researchers presented the content of 3.6% Mo, increasing the possibility of precipitation of this phase, which is directly linked to the content of this element in the alloy. The studies of Park et al 12 and Kokawa et al 13 , also using MET analysis, suggest the presence of sigma phase (σ) in AISI 304 steel welded by FSW. Analyzing the same welding process, Chen et al…”

Section: Resultsmentioning

confidence: 98%

Effects of Aging at 450°C on the Pitting Corrosion Resistance and Toughness of AISI 317L Steel Welded by GTAW and FSW

et al. 2017

View full text Add to dashboard Cite

Austenitic stainless steels are high corrosion resistant alloys widely used in many industrial fields. Among this family of steels, AISI 317L stands out due to its higher localized corrosion resistance when compared to the traditional grades AISI 304L and AISI 316L. In some applications in oil refineries, the AISI 317L is being specified for services at moderately high temperatures. At the same time as it is sought to use new stainless steels, is also desirable to apply and develop emerging welding processes, replacing conventional ones, in order to achieve better behavior in service. In this respect, this work studied the effects of thermal aging on the toughness and resistance to pitting corrosion of AISI 317L steel weld metals produced by the Gas Tungsten Arc Welding (GTAW) and Friction Stir Welding (FSW) joining processes. After prolonged exposures at 450°C, for 200h, 300h and 400h, the microstructural characterization by scanning electron microscopy (SEM), toughness evaluation and anodic polarization tests in 3.5% NaCl solution were performed. The results showed that the increase of the exposure time in both weld metals caused a toughness decrease. The pitting potentials measured in the polarization tests also decreased with the aging at 450ºC.

show abstract

Section: Resultsmentioning

confidence: 98%

Effects of Aging at 450°C on the Pitting Corrosion Resistance and Toughness of AISI 317L Steel Welded by GTAW and FSW

et al. 2017

View full text Add to dashboard Cite

show abstract

“…Also, the dominantshear direction was everywhere aligned with the tangent to the rotating tool, and aprominent {111} orientation is oriented 70 deg away from plate normal from immediately under the shoulder to the midplane of aw eld. [25] Furthermore, Park et al [11,27] havea pplied FSW to hcp Mg in which slip occursp referentially on the {0002} basal plane, which was shown to align with an ellipsoidal surface in the nugget-shaped SZ. In the friction-stir-processed NABm aterial, the Bfi ber is evidently the dominant shear texture orientation in the TMAZ( the A/B intersection is at one end of the Bfi ber).…”

Section: B Texturei Nt He Sz and Tmazmentioning

confidence: 99%

“…Friction stir processing has been employedt oh omogenize and refine microstructures in both cast and wrought metals, includinga lloys of Al [5][6][7][8][9][10] and Mg [11,12] and higher melting alloys of Cu, [13] Fe, [14] and Ti. [15] BenefitsofFSP in cast metals include elimination of porosity and local conversion of cast microstructures to awrought condition, with enhanced near-surface properties.S ignificantly improved strength/ductilityc ombinations [16,17] and high-strain-rate superplasticity [3][4][5][6][7]18] havebeen achieved by FSP of wrought materials.…”

Section: Introductionmentioning

confidence: 99%

A microtexture investigation of recrystallization during friction stir processing of as-cast NiAl bronze

Oh-ishi

Zhilyaev

McNelley

2006

Metall Mater Trans A

View full text Add to dashboard Cite

“…[18][19][20] Some studies reported that the severe plastic deformation and recrystallization accelerated the formation of phase in the 308 stainless steel, 21) microduplex steel 22,23) and 304 austenite stainless steel. 24) In friction welding process, each central and peripheral interface experienced the different thermo-mechanical conditions due to the different regional velocity. 9) For example, the velocity of the central interface was 0 m/s, while that of the peripheral interface reached 3 m/s.…”

Section: Resultsmentioning

confidence: 99%

Effect of Microstructure on Mechanical Properties of Friction-Welded Joints between Ti and AISI 321 Stainless Steel

Lee

Jung

2004

Mater. Trans.

View full text Add to dashboard Cite

The microstructures and mechanical properties of the friction welded pure Ti/AISI 321 stainless steel have been investigated. From the Ti side from the interface to the Ti base metal, the sequence of recrystallized grain, elongated grain and many twin embedded grain structures were observed. The reaction layers were formed within 0.2 mm thickness at the interface under the conditions of relatively longer friction time (t 1 ) and lower upset pressure (P 2 ). These reaction layers formed at the central interface were identified as (Fe, Cr) 2 Ti, FeTi 2 or Fe 2 Ti 4 O and -Ti, while those of the peripheral interface were identified as FeCr ( phase), (Fe, Cr) 2 Ti, FeTi and -Ti. The phase was restrictedly formed at the peripheral interface. Higher mechanical properties were acquired under higher upset pressure condition due to higher compressive force between bonded materials, smaller grain size and narrower thickness of reaction layer. Therefore, maximum ultimate tensile strength of these joints was approximately 420 MPa with the conditions of 400 MPa of P 2 and 0.5 s of t 1 .

show abstract

Rapid formation of the sigma phase in 304 stainless steel during friction stir welding

Cited by 250 publications

References 20 publications

Effects of Aging at 450°C on the Pitting Corrosion Resistance and Toughness of AISI 317L Steel Welded by GTAW and FSW

Effects of Aging at 450°C on the Pitting Corrosion Resistance and Toughness of AISI 317L Steel Welded by GTAW and FSW

A microtexture investigation of recrystallization during friction stir processing of as-cast NiAl bronze

Effect of Microstructure on Mechanical Properties of Friction-Welded Joints between Ti and AISI 321 Stainless Steel

Contact Info

Product

Resources

About