Friction stir processing of 316L stainless steel plate

Chen, Y. C.; Fujii, Hidetoshi; Tsumura, Takuya; Kitagawa, Yutaka; Nakata, Kohei; Ikeuchi, Kenji; Matsubayashi, Kazuki; Michishita, Y.; Fujiya, Yasuyuki; Katoh, J.

doi:10.1179/136217108x386527

Cited by 56 publications

(43 citation statements)

References 24 publications

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“…On the other hand, due to the opposite directions of rotation and translation, the minimum relative velocity occurs on the RS where the material is forced against the translation direction and results in maximized material mixing. [5,[40][41][42][43][44] Therefore, when joining dissimilar materials, taking into account the discontinuity in inherent material properties and the asymmetric nature of FSW, it is necessary to consider which side of the joint should contain the AS or RS, to achieve optimal mixing and superior properties.…”

Section: Friction Stir Welding (Fsw) Is a Solid-statementioning

confidence: 99%

“…Changing the heating rate by 10 K/s (10°C/s) (i.e., slower or faster) in the analysis results in less than 15 K (15°C) variation from the average values. [64] This shows that although the temperature on the AS may rise to temperatures slightly higher than that of the RS due to firstly, the harder nature of the DSS, [63] and secondly the higher heat input resulted from the alignment of both rotational and translational movements of the probe in a same direction, [40][41][42][43][44] the temperature cannot still be far above the Ac 1 of the S275 steel (i.e., 1079 ± 24 K) during FSW, considering a fairly high thermal conductivity of steels.…”

Section: A Microstructure Evolutionmentioning

confidence: 99%

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Evolution of Microstructure and Crystallographic Texture During Dissimilar Friction Stir Welding of Duplex Stainless Steel to Low Carbon-Manganese Structural Steel

Rahimi

Konkova

Violatos

et al. 2018

Metall Mater Trans A

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Electron backscattered diffraction (EBSD) was used to analyze the evolution of microstructure and crystallographic texture during friction stir welding of dissimilar type 2205 duplex stainless steel (DSS) to type S275 low carbon-manganese structural steel. The results of microstructural analyses show that the temperature in the center of stirred zone reached temperatures between Ac 1 and Ac 3 during welding, resulting in a minor ferrite-to-austenite phase transformation in the S275 steel, and no changes in the fractions of ferrite and austenite in the DSS. Temperatures in the thermomechanically affected and shoulder-affected zones of both materials, in particular toward the root of the weld, did not exceed the Ac 1 of S275 steel. The shear generated by the friction between the material and the rotating probe occurred in austenitic/ferritic phase field of the S275 and DSS. In the former, the transformed austenite regions of the microstructure were transformed to acicular ferrite, on cooling, while the dual-phase austenitic/ferritic structure of the latter was retained. Studying the development of crystallographic textures with regard to shear flow lines generated by the probe tool showed the dominance of simple shear components across the whole weld in both materials. The ferrite texture in S275 steel was dominated by D 1 , D 2 , E, E , and F, where the fraction of acicular ferrite formed on cooling showed a negligible deviation from the texture for the ideal shear texture components of bcc metals. The ferrite texture in DSS was dominated by D 1 , D 2 , I, I , and F, and that of austenite was dominated by the A, A, B, and B of the ideal shear texture components for bcc and fcc metals, respectively. While D 1 , D 2 , and F components of the ideal shear texture are common between the ferrite in S275 steel and that of dual-phase DSS, the preferential partitioning of strain into the ferrite phase of DSS led to the development of I and I components in DSS, as opposed to E and E in the S275 steel. The formations of fine and ultrafine equiaxed grains were observed in different regions of both materials that are believed to be due to strain-induced continuous dynamic recrystallization (CDRX) in ferrite of both DSS and S275 steel, and discontinuous dynamic recrystallization (DDRX) in austenite phase of DSS.

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Section: Friction Stir Welding (Fsw) Is a Solid-statementioning

confidence: 99%

Section: A Microstructure Evolutionmentioning

confidence: 99%

Evolution of Microstructure and Crystallographic Texture During Dissimilar Friction Stir Welding of Duplex Stainless Steel to Low Carbon-Manganese Structural Steel

Rahimi

Konkova

Violatos

et al. 2018

Metall Mater Trans A

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“…The chemical compositions and mechanical properties of the as-received plates and filling tools are shown in Table 1. The FSP was performed using PCBN tool based on previous reports [6,7]. The remaining keyhole was prepared by machining according to PCBN tool for FSP, as illustrated in Fig.…”

Section: Methodsmentioning

confidence: 99%

“…Generally, the decomposition of austenite to σ phase takes a long time due to the accompanying redistribution of alloying elements by substitutional diffusion in typical fusion welding process [21]. However, σ phase can be rapidly formed in the SZ by the transformation of austenite to δ-ferrite at high temperatures and the subsequent decomposition of the ferrite since FSW introduces high strain and it accompanies DRX [6,7,22,23]. As for the refilled joints by the current FFSW process, microstructure in representative area (bottom part at the IZ) was further characterized by TEM, as shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

“…The technology of FSP also could repair internal or surface defects formed in processes such as casting and welding [4,5]. In a previous related study, SCC on 316L stainless steel was repaired by FSP using polycrystalline cubic boron nitride (PCBN) tools [6,7]. However, keyhole remains at the end of the seam with the extraction of the nonconsumable pin.…”

Section: Introductionmentioning

confidence: 99%

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Interface behavior and mechanical properties of 316L stainless steel filling friction stir welded joints

Zhou

Huang

et al. 2015

Int J Adv Manuf Technol

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In the present work, the feasibility to repair keyhole left at 316L stainless steel friction stir welding/friction stir processing (FSW/FSP) seam by filling friction stir welding (FFSW) using consumable tools was investigated. Interface behavior and mechanical properties of 316L stainless steel FFSW joints were investigated. The results showed that significant microstructural refinement occurred around the interface of refilled keyhole due to extreme levels of plastic deformation and thermal exposure. No σ phase but few Cr carbides were formed at the refilled joint interface, which would not result in obvious corrosion resistance degradation of 316L stainless steel. Void defects formed at the bottom of the refilled keyhole and the FFSW joint fractured at the interface during the tensile test.

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