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

Zhou, Li; Zhou, Wenlu; Huang, Yongxian; Feng, Jicai

doi:10.1007/s00170-015-7237-5

Cited by 9 publications

(3 citation statements)

References 17 publications

(26 reference statements)

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“…13(c). Cr 23 C 6 is a common carbide phase that can easily form in the process of welding austenitic stainless steel due to the element diffusion [24].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Microstructure characterization and properties of carbon steel to stainless steel dissimilar metal joint made by friction welding

Qin

Geng

et al. 2015

Materials & Design

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“…13(c). Cr 23 C 6 is a common carbide phase that can easily form in the process of welding austenitic stainless steel due to the element diffusion [24].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Microstructure characterization and properties of carbon steel to stainless steel dissimilar metal joint made by friction welding

Qin

Geng

et al. 2015

Materials & Design

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“…In hot working processes such as friction welding, friction stir welding size of subgrains depends entirely on the strain rate and temperature. 31,32 Decrease in temperature and an increase in strain rate will form the large size of subgrains during the recrystallization process. Generally, subgrain structure evaluation is done by the Zener-Hollomon parameter (Z h ).…”

Section: Effect Of Welding Processes On Ferrite Contentmentioning

confidence: 99%

Role of welding processes on microstructure and mechanical properties of nuclear grade stainless steel joints

Rajasekaran¹,

Lakshminarayanan²,

Vasudevan

et al. 2019

Proceedings of the IMechE

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Nuclear grade 316LN austenitic stainless steel weld joints were fabricated using conventional gas tungsten arc welding (GTAW), activated flux gas tungsten arc welding (AGTAW), laser beam welding (LBW) and friction stir welding (FSW) processes. Assessment of weld beads was done by mechanical and metallurgical characterizations. Bead geometry and weld zones were studied by taking macrographs along the transverse side of the weld joints. Metallurgical features of different weld joints were carried out using optical microscopy and scanning electron microscopy. Microhardness distribution across four weld joints was recorded and hardness variations were compared. All weld zone, heat affected zone (HAZ) of GTAW and LBW, thermo-mechanically affected zone (TMAZ) of FSW processes, exhibited higher hardness values than the base metal. Reduced hardness was recorded at HAZ of AGTAW process. This was the result of a considerable grain growth. LBW joint showed the highest hardness value at the center of the fusion zone due to fine equiaxed dendrite morphology. Tensile and impact properties of different welding processes were evaluated and comparisons were made at room temperature. All weld samples displayed high yield strength (YS) and ultimate tensile strength (UTS) with a lower percentage of elongation compared to that of the base metal. FSW joint showed improved YS, UTS and impact toughness compared to other weld joints. This is attributed to the formation of strain-free fine equiaxed grains at stir zone around 5 µm in size with subgrains of 2 µm in size by severe dynamic recrystallization mechanism. Among the fusion welding techniques, AGTAW process exhibited improved toughness, besides almost equal toughness of the base metal due to low δ-Ferrite with high austenite content. Fractography studies of the base metal and different weld samples were carried out by SEM analysis and features were compared.

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“…Defect free welds were produced with rotational speed of 1100 rpm and traverse speed of 8 mm/min and welds showed similar tensile strength that of the base material with comparable elongation. Zhou et al [20] tried to address the keyhole gap problem during friction stir welding of 316L stainless steel using consumable tool bar of similar material. Fine grain microstructure is obtained in stir zone, however void defects are observed at the bottom surface of keyhole.…”

Section: Fig 2:-microstructural Regions Of Friction Stir Welding (Mamentioning

confidence: 99%

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

Cited by 9 publications

References 17 publications

Microstructure characterization and properties of carbon steel to stainless steel dissimilar metal joint made by friction welding

Microstructure characterization and properties of carbon steel to stainless steel dissimilar metal joint made by friction welding

Role of welding processes on microstructure and mechanical properties of nuclear grade stainless steel joints

Friction Stir Welding of Stainless Steels – Review.

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