Effect of fixed location variation in friction stir welding of steels with different carbon contents

Choi, Don-Hyun; Lee, C.-Y.; Ahn, Byung-Wook; Yeon, Yun-Mo; Park, S.-H. C.; Sato, Yutaka; Kokawa, Hiroyuki; Jung, Seung‐Boo

doi:10.1179/136217109x12577814486737

Cited by 29 publications

(10 citation statements)

References 15 publications

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“…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%

“…The result of previous research on dissimilar FSW steels showed that placing the stronger steel on the AS increased the amount of martensite formation and reduced the size of SZ compared to a condition where the stronger steel is on the RS. [63] This was due to the higher temperature and stress resulting from placing the harder steel on the AS. High magnification OM of both materials in the weld region reveals variations in the microstructure and grain morphology in different zones (see Figures 4 and 5).…”

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: A Microstructure Evolutionmentioning

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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“…Usually, the tool offset is considered in the softer material and it is better to place the softer material in the RS. 38,39,[42][43][44][45] According to previous efforts on the FSW of dissimilar metals, it has been demonstrated that when the softer material is placed at the AS, sound FSW (i.e. good quality in both surface morphology and microstructure) is achieved.…”

Section: Fsw Of Al-cu Bimetalsmentioning

confidence: 99%

Experimental notched fracture resistance study for the interface of Al–Cu bimetal joints welded by friction stir welding

Aliha

Fotouhi

Berto

2017

Proceedings of the Institution of Mechanical Engineers, Part B:

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Strength and load-bearing capacity of dissimilar joints welded by friction stir welding is one of the most interesting subjects for optimizing this recently developed joining technique. Hence, in this article, dissimilar butt weldments of pure copper with Al5083 are manufactured with different welding parameters (including pin rotational and tool offset). Then rectangular beam specimens containing right angle notches in the interface of joints were prepared from the welded plates and tested under threepoint bend loading to investigate the interface fracture strength of Al-Cu joints. The results showed the significant influence of welding parameters on the strength and load-displacement curves of the tested bimetals. It was shown that considering a suitable value for the offset of pin can increase the interface fracture strength. The highest fracture loads were achieved at moderately lower pin rotational speeds.

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“…It was discovered that the placement of the stronger material on the advancing side reduced the weld nugget size and increased the amount of martensite formation. The location of the strongest material on the advancing side led to higher temperature and stress due to the highest temperature on the advancing side [22]. It is evident from the literature that the FSW that involved materials that are mechanically apart involved mainly 2xxx as the weaker material.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Friction Stir Welded AA1050-H14 and AA5083-H111 Joint: Sampling Aspect

Msomi

Mbana

2020

Metals

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Welding of dissimilar aluminium alloys has been a challenge for a long period until the discovery of the solid-state welding technique called friction stir welding (FSW). The discovery of this technique encouraged different research interests revolving around the optimization of this technique. This involves the welding parameters optimization and this optimization is categorized into two classes, i.e., similar alloys and dissimilar alloys. This paper reports about the mechanical properties of the friction stir welded dissimilar AA1050-H14 and AA5083-H111 joint. The main focus is to compare the mechanical properties of specimens extracted from different locations of the welds, i.e., the beginning, middle, and the end of the weld. The specimen extracted at the beginning of the weld showed low tensile properties compared to specimens extracted from different locations of the weld. There was no certain trend noted through the bending results. All three specimens showed dimpled fracture, which is the characterization of the ductile fracture.

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Effect of fixed location variation in friction stir welding of steels with different carbon contents

Cited by 29 publications

References 15 publications

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

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

Experimental notched fracture resistance study for the interface of Al–Cu bimetal joints welded by friction stir welding

Mechanical Properties of Friction Stir Welded AA1050-H14 and AA5083-H111 Joint: Sampling Aspect

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