Microstructural evolution in friction stir welding of high-strength linepipe steel

Cho, Hoon-Hwe; Kang, Suk Hoon; Kim, Sunghwan; Oh, Kyu Hwan; Kim, Heung Ju; Chang, Woong-Seong; Han, Heung Nam

doi:10.1016/j.matdes.2011.08.010

Cited by 72 publications

(44 citation statements)

References 33 publications

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“…Meanwhile, the initially large grains of WNZ were fragmented and refined and the fine-grained microstructures of dynamic recrystallization were formed on WNZ. This has been reported by Cho et al [34] in the friction stir welded joint of high-strength pipe line steels. By contrasting Figure 3a,b, it can be seen that the surface of steel did not change after the immersion test, but corrosion holes and corrosion products appeared on the surface of 6082 aluminum alloy, which also lost its metallic luster.…”

Section: Corrosion Morphology and Mechanismsupporting

confidence: 70%

Corrosion Behavior of Keyhole-Free Friction Stir Spot Welded Joints of Dissimilar 6082 Aluminum Alloy and DP600 Galvanized Steel in 3.5% NaCl Solution

Zhang

et al. 2017

Metals

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Abstract:The corrosion behavior of keyhole-free friction stir spot welded joints of dissimilar 6082 aluminum alloy and DP600 galvanized steel in 3.5% NaCl solution has been investigated by the immersion test and electrochemical analysis. The surface of the aluminum alloy produced exfoliation and pitting corrosion. The pitting occurred seriously on the interface of the 6082 aluminum alloy, but the steel had no corrosion. The corrosion galvanic couples were formed between elements of Si and Fe with a high electrode potential, and Mg and Al with a low electrode potential, around them. Mg and Al elements of Mg 2 Si and Si-containing solid-solution phase α (Al) preferentially became an anodic dissolution and formed exfoliation corrosion around the Si elements. Fe-rich phase θ (Al 3 Fe) as the cathode caused corrosion of Mg and formed pitting around Mg-rich phase β (Al 3 Mg 2 ) as the anode. The sequence of the corrosion resistance of different areas of the joints (with decreasing corrosion resistance) was WNZ (Weld Nugget Zone) > TMAZ (Thermo-mechanically Affected Zone) > BM (Base Metal) > HAZ (Heat-affected Zone). The joints of keyhole-free FSSW (Fiction Stir Spot Welding) of dissimilar 6082 aluminum alloy and DP600 galvanized steel have better corrosion resistance than base metal in 3.5% NaCl solution.

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Section: Corrosion Morphology and Mechanismsupporting

confidence: 70%

Corrosion Behavior of Keyhole-Free Friction Stir Spot Welded Joints of Dissimilar 6082 Aluminum Alloy and DP600 Galvanized Steel in 3.5% NaCl Solution

Zhang

et al. 2017

Metals

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“…Microstructure and mechanical properties of friction stir welded 409M ferritic stainless steel joints were evaluated by Lakshminarayanan and Balasubramanian [23] and found that properties such as tensile strength, ductility and impact toughness were observed in acceptable limit at a welding speed of 50 mm/min and rotation speed of 1000 rpm. Investigations on the microstructure of friction stir welded ferritic stainless steel revealed the presence of bainitic structure in nugget zone and hence increase in hardness of the this zone [24]. Fine grains in nugget zone and TMAZ were observed by Han et al [25] owing to mechanical stirring and heating.…”

Section: Ferritic Stainless Steel:-mentioning

confidence: 96%

Friction Stir Welding of Stainless Steels – Review.

Rajasekhar¹

2016

IJAR

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After development of tungsten alloys and polycrystalline cubic boron nitride (PCBN) tools, lot of progress is made in FSW of stainless steel. Although some issues remain to be solved, satisfactory welds are produced and weld properties are found suitable for the intended applications. This paper summarizes the progress of research work on Friction stir welding of different types of stainless steels. It covers the research made in the selection of suitable tool materials, optimizing the process parameters such as tool travel speed, rotational speed, tilt angle etc. The influence of Friction stir welding on microstructure and mechanical properties of welds has also been reviewed. Fusion welding involves use of filler materials, shielding gases, and development of high energy density which results wider heat affected zone. The weldments show appreciable modification in the microstructure and properties of weld and heat affected zones, which may result solidification defects like distortion, , lack of penetration, poor fusion, cracks etc. Use of plasma arc and laser beam welding techniques can produce sound welds of thicker materials with narrow heat affected zone [2], however these techniques are not suitable for certain materials such as aluminium, magnesium etc.The drawbacks in the fusion welding techniques can some extent addressed by solid state welding techniques (e.g. resistance welding, friction welding) in which welding takes place at a temperature lower than the melting point of base metals and also no filler material and / or shielding gases are required. In resistance welding coalescence occurs due to heat generated by contact resistance and applied pressure and hence, it is not suitable for materials having high electrical conductivity (e.g. aluminium, copper). Friction welding employs frictional heat generated when a moving workpiece and a fixed component are forced together in order to obtain the required heat and temperature for weld. However, the application of friction welding is limited by the geometry of the workpieces to be joined.The above difficulties can successfully overcome by friction stir welding (FSW), a solid state welding process which was developed by the welding institute (TWI) [3] primarily for welding of aluminium and magnesium based alloys. The major advantages of FSW over other welding processes are lower distortion, good dimensional stability, absence of cracking etc.

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“…A tensile strength of 476 MPa was attained which surpassed that of the base metal of 463 MPa. Cho et al (2012) [6] studied the microstructural evolution in friction stir welding of high-strength API X100 grade linepipe steel 10mm on thickness using a PCBN tool with 16 mm shoulder diameter and 4 mm pin diameter in an inert gas environment. A rotation speed of 450 rpm and a traverse speed of 127 mm/min were used.…”

Section: IImentioning

confidence: 99%

Friction Stir Welding of steels: AReview Paper

Chiteka¹

2013

IOSR-JMCE

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Microstructural evolution in friction stir welding of high-strength linepipe steel

Cited by 72 publications

References 33 publications

Corrosion Behavior of Keyhole-Free Friction Stir Spot Welded Joints of Dissimilar 6082 Aluminum Alloy and DP600 Galvanized Steel in 3.5% NaCl Solution

Corrosion Behavior of Keyhole-Free Friction Stir Spot Welded Joints of Dissimilar 6082 Aluminum Alloy and DP600 Galvanized Steel in 3.5% NaCl Solution

Friction Stir Welding of Stainless Steels – Review.

Friction Stir Welding of steels: AReview Paper

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