Physical Simulation of Friction Stir Welding and Processing of Nickel-Base Alloys Using Hot Torsion

Rule, James; Lippold, John C.

doi:10.1007/s11661-013-1742-7

Cited by 14 publications

(3 citation statements)

References 4 publications

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“…However, FSW occurs in the solid state and the cooling rate is fast enough to hinder carbide coarsening, forming a shallow Cr depletion zone [2]. It has been reported that FSW of Alloy 625 reaches a peak temperature of 1150°C with a cooling time between 800°C and 500°C (t 8/5 ) below 20 s [23]. Therefore, there is not enough time for significant carbide coarsening during FSW.…”

Section: Discussionmentioning

confidence: 99%

Quantitative analysis of susceptibility to intergranular corrosion in alloy 625 joined by friction stir welding

Fonseca

Fatichi

Terada

et al. 2022

Corrosion Engineering, Science and Technology

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Alloy 625 is a Ni-based alloy used in aerospace, energy, chemical, oil and gas industries, mainly as cladding material due to its corrosion resistance, high strength and creep resistance at high temperature. In this study, microstructural evaluation and susceptibility to intergranular corrosion of base metal and friction stir welded Alloy 625 were investigated. Friction stir welded joints exhibited a lower corrosion rate and degree of sensitisation compared to the base metal. It is mainly due to grain refinement and lower cooling rate of the friction stir welding process. The stir zone of the present weld has a finer grain structure and lower density of twin boundaries than the base metal and it led to the improvement of the mechanical and corrosion properties.

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Section: Discussionmentioning

confidence: 99%

Quantitative analysis of susceptibility to intergranular corrosion in alloy 625 joined by friction stir welding

Fonseca

Fatichi

Terada

et al. 2022

Corrosion Engineering, Science and Technology

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show abstract

“…[ 16 ] The maximum strain rate that can be achieved in torsion is generally in the order of 10 s −1 . Hot torsion tests have been shown to reproduce the friction stirred microstructure in SZ and TMAZ for steel, [ 5 ] titanium, [ 17 ] nickel‐base alloys, [ 18 ] pure aluminum, [ 19 ] and AA5019. [ 4 ] Specifically for AA2219‐T87 alloys, currently its hot deformation behavior has been only studied by split‐Hopkinson bar and hot compression.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Behavior and Microstructure Evolution during Hot Torsion Deformation of Aluminum Alloy AA2219

Gilmore

Liu

2022

Adv Eng Mater

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This study comprehensively analyzes the mechanical behavior and microstructural evolution of aluminum alloy AA2219-T87 undergoing high deformation and strain rates at elevated temperatures via hot torsion tests. An integrated experimental and modeling approach is employed, where a finite element model (FEM) is developed with ABAQUS to address local deformation and nonuniform temperature distribution along the specimen gauge section. A Johnson-Cook constitutive material model is calibrated based on the calculated and measured torque curves at different conditions. The grain structure distribution is characterized through optical microscopy and electron backscatter diffraction (EBSD) analysis. Combined with the ABAQUS calculated local thermomechanical conditions, microstructure modeling, using established literature-based equations, is established to provide insights into grain size distribution and recrystallization mechanisms. The calibrated material constitutive model, recrystallization model, and grain size model can be utilized to model various manufacturing processes, which involve hot deformation of aluminum alloys in the intermediate strain rate range of 14-78 s À1 . The constitutive model shows adequate matching of the experimental torque curves at 400, 450, and 500 °C. The recrystallization prediction model functions at over 94% accuracy and the grain size model provides an average deviation between predicted and measured grain size reduction of 11.5%.

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“…It is difficult to consider these factors comprehensively and quantitatively. Fortunately, the Gleeble hot torsion test was used in an attempt to simulate the friction stir-processed microstructure of Ni-base alloys [25], Ti-6Al-4V [26] and duplex stainless steel [27]. Though the samples exhibit larger grain size than actual friction stir processing trials, the microstructure and continuous dynamic recrystallization of thermo-mechanically affected zone were successfully simulated.…”

Section: Introductionmentioning

confidence: 99%

The formation mechanism of intermetallic compounds in Al/Mg friction-stir weld joint

Chen

Wang

Xiao

et al. 2018

Materials Science and Technology

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The mechanical properties of dissimilar metal joints are strongly related to the brittle intermetallic compounds (IMCs) that form at the weld interfaces. In this study, the effects of temperature, local composition and plastic strain on the formation mechanism of IMCs in a welded joint between 6061 Al and AZ31 Mg were investigated. The results demonstrate that Al3Mg2 is formed when the strain rate reaches 10 s−1, even though the temperature is lower than the Al–Mg eutectic temperature, which suggests that plastic deformation may accelerate the formation of IMCs in the deformation zone. Meanwhile, the formation of Al–Mg IMCs can be suppressed by Mg–Zn and Al–Mg–Zn compounds when Zn filler is added at the Al/Mg interfaces.

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Physical Simulation of Friction Stir Welding and Processing of Nickel-Base Alloys Using Hot Torsion

Cited by 14 publications

References 4 publications

Quantitative analysis of susceptibility to intergranular corrosion in alloy 625 joined by friction stir welding

Quantitative analysis of susceptibility to intergranular corrosion in alloy 625 joined by friction stir welding

Mechanical Behavior and Microstructure Evolution during Hot Torsion Deformation of Aluminum Alloy AA2219

The formation mechanism of intermetallic compounds in Al/Mg friction-stir weld joint

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