Microstructural simulation of friction stir welding using a cellular automaton method: a microstructure prediction of AZ91 magnesium alloy

Asadi, Parviz; Givi, Mohammad Kazem Besharati; Akbari, Mostafa

doi:10.1186/s40712-015-0048-5

Cited by 45 publications

(17 citation statements)

References 36 publications

(58 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Assuming that reduction of the joint strength parameters is induced by a copper recrystallisation process in the HAZ, this effect should be more intensive for a lower V-value, which corresponds to the higher amount of thermal energy generated during the FSW process. Besides the aforementioned experimental data, this mechanism is also confirmed by numerical simulations of the FSW welding process [30]. Macroscopic analysis of tensile fracture surfaces of FSW joints did not show distinct defects in the weld structure.…”

Section: Monotonic Tests Resultssupporting

confidence: 71%

Effect of FSW Traverse Speed on Mechanical Properties of Copper Plate Joints

et al. 2020

View full text Add to dashboard Cite

The paper describes the influence of the friction stir welding travel speed on the mechanical properties of the butt joints of copper plates. The results of static and fatigue tests of the base material (Cu-ETP R220) and welded specimens produced at various travel speeds were compared, considering a loading applied both parallel and perpendicularly to the rolling direction of the plates. The mechanical properties of the FSW joints were evaluated with respect to parameters of plates’ material in the delivery state and after recrystallisation annealing. The strength parameters of friction stir welding joints were compared with the data on tungsten inert gas welded joints of copper plates available in the literature. The results of microhardness tests and fractographic analysis of tested joints are also presented. Based on the above test results, it was shown that although in the whole range of considered traverse speeds (from 40 to 80 mm/min), comparable properties were obtained for FSW copper joints in terms of their visual and microstructural evaluation, their static and especially fatigue parameters were different, most apparent in the nine-fold greater observed average fatigue life. The fatigue tests turned out to be more sensitive criteria for evaluation of the FSW joints’ qualities.

show abstract

Section: Monotonic Tests Resultssupporting

confidence: 71%

Effect of FSW Traverse Speed on Mechanical Properties of Copper Plate Joints

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Shoulder H prob (13) where s is the contact shear stress; R shoulder , the tool shoulder radius; x, the tool angular rotation speed; and H prob is the tool probe height. On one hand, increase in the temperature is favorable for the solid diffusion and material mixing, and hence, is helpful for weld quality.…”

Section: Numerical Studymentioning

confidence: 99%

“…The pervious works have considered only single material in their models. [12][13][14][15] Moreover, stable time increment reduces with the ALE method due to the mesh distortion while it remains constant for the CEL method. This leads to higher computation time for ALE as compared with the CEL method.…”

Section: Introductionmentioning

confidence: 99%

Dissimilar friction stir lap welding of aluminum to brass: Modeling of material mixing using coupled Eulerian–Lagrangian method with experimental verifications

Akbari

Asadi

2020

Proceedings of the Institution of Mechanical Engineers, Part L:

Self Cite

View full text Add to dashboard Cite

The intermetallic compounds formation and inter-material mixing have a critical impact on achieving a sound joint with fine mechanical properties in the case of dissimilar metal friction stir welding. In this investigation formation of intermetallic compounds as well as material flow that results in inter-material mixing during friction stir lap welding of aluminum and brass are studied. First, the 2.5-mm-thick aluminum sheet was laid on the same-thickness brass sheet and then, friction stir lap welding was applied using a tool with 4-mm pin length and 6-mm pin diameter. Next, experimental investigations were performed using scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, microhardness, and tensile shear test to probe the chemical compositions and intermetallic formation in the stir zone. Moreover, the coupled Eulerian–Lagrangian method is employed to simulate the stir zone formation during the process to further study inter-material mixing. In this method, the workpiece is modeled using Eulerian formulation, while Lagrangian formulation is utilized to model the tool. The model successfully predicts the stir zone formation and inter-material mixing in the aluminum–brass interface. Results shows that by increasing tool rotational speed from 500 to 2000 r/min the amount of inter material mixing significantly increases. Therefore, to achieve a joint with the highest strength in friction stir lap welding of aluminum–brass, the rotational speed should be lowered as much as it can produce defect-free joint.

show abstract

“…As a consequence, those models do not apply to hexagonal closed packed (hcp) metals such as Mg and its alloys, experiencing anisotropic plasticity as well as alternative strainaccommodating processes such as deformation twinning (Christian and Mahajan, 1995) whose finite twinning shears are not representable by small-strain models. Recent work by Asadi et al (2015) captured dynamic recovery and dynamic recrystallization in Mg alloy AZ91 by a 2D cellular automaton. However, the underlying material model based on Mecking and Kocks (1981) does not yield an accurate representation of the anisotropic inelasticity in hcp metals.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Stochastic modeling of discontinuous dynamic recrystallization at finite strains in hcp metals

Tutcuoglu

Vidyasagar

Bhattacharya

et al. 2019

Journal of the Mechanics and Physics of Solids

View full text Add to dashboard Cite

We present a model that aims to describe the effective, macroscale material response as well as the underlying mesoscale processes during discontinuous dynamic recrystallization under severe plastic deformation. Broadly, the model brings together two well-established but distinct approaches -first, a continuum crystal plasticity and twinning approach to describe complex deformation in the various grains, and second, a discrete Monte-Carlo-Potts approach to describe grain boundary migration and nucleation. The model is implemented within a finite-strain Fast Fourier Transform-based framework that allows for efficient simulations of recrystallization at high spatial resolution, while the grid-based Fourier treatment lends itself naturally to the Monte-Carlo approach. The model is applied to pure magnesium as a representative hexagonal closed packed metal, but is sufficiently general to admit extension to other material systems. Results demonstrate the evolution of the grain architecture in representative volume elements and the associated stress-strain history during the severe simple shear deformation typical of equal channel angular extrusion. We confirm that the recrystallization kinetics converge with increasing grid resolution and that the resulting model captures the experimentally observed transition from single-to multi-peak stress-strain behavior as a function of temperature and rate.

show abstract

Microstructural simulation of friction stir welding using a cellular automaton method: a microstructure prediction of AZ91 magnesium alloy

Cited by 45 publications

References 36 publications

Effect of FSW Traverse Speed on Mechanical Properties of Copper Plate Joints

Effect of FSW Traverse Speed on Mechanical Properties of Copper Plate Joints

Dissimilar friction stir lap welding of aluminum to brass: Modeling of material mixing using coupled Eulerian–Lagrangian method with experimental verifications

Stochastic modeling of discontinuous dynamic recrystallization at finite strains in hcp metals

Contact Info

Product

Resources

About