Optimization of microstructural and mechanical properties of friction stir welding using the cellular automaton and Taguchi method

Shojaeefard, Mohammad Hassan; Akbari, Mostafa; Khalkhali, Abolfazl; Asadi, Parviz; Parivar, Amir Hossein

doi:10.1016/j.matdes.2014.08.014

Cited by 58 publications

(35 citation statements)

References 19 publications

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“…In the present model, the initial structure, the plastic deformation and its effects on the dislocation density as well as changes in the shape of grains were evaluated during the CDRX phenomenon. The CA approach, which can model phenomena in a discrete form of the time and space [20], is an interesting modeling method for scientists due to its calibration ability and reasonable execution time [43]. A CA-based procedure comprises unit cells arrayed in one, two or three dimensions.…”

Section: The Ca Model Conceptmentioning

confidence: 99%

A Combined Method to Model Dynamic Recrystallization Based on Cellular Automaton and a Phenomenological (CAP) Approach

Azarbarmas

Mirjavadi

Ghasemi

2018

Metals

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Titanium alloys with high stacking-fault energy show continuous dynamic recrystallization (CDRX) instead of discontinuous dynamic recrystallization (DDRX) during high-temperature deformation. During the CDRX mechanism, new recrystallized grains are generated by the progressive increasing of the low-angle boundary misorientations. In the present work, the CDRX phenomenon was modeled by using a cellular automaton (CA)-based method. The size of seeds was determined based on a phenomenological approach, and then the number and distribution of recrystallized grains as well as the topological changes were applied by utilizing the CA approach. In order to verify the capacity of the proposed model for predicting the microstructural characteristics, the experimental data of the hot-compressed TiNiFe alloy were used. Results showed that the presented model can accurately estimate the fraction of the recrystallized area. Moreover, the macroscopic flow curves of the alloy were well predicted by the present model.

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Section: The Ca Model Conceptmentioning

confidence: 99%

A Combined Method to Model Dynamic Recrystallization Based on Cellular Automaton and a Phenomenological (CAP) Approach

Azarbarmas

Mirjavadi

Ghasemi

2018

Metals

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“…The finer elements in the mean size of 0.5 mm were placed under the tool pin. More details on FEM model can be found in authors' pervious works [7,16,[30][31][32][33][34][35]. …”

Section: -mentioning

confidence: 99%

“…FSP has been invented based on friction stir welding (FSW) for the microstructure modification of materials [7,8], which results in improving their mechanical and wear resistance. FSW as a welding technique has been used to weld different Al [8,[13][14][15][16], Mg [7,17,18], and Cu [13,19] alloys, some of which are classified as practically unweldable alloys in use of conventional welding methods. Different surface composites have been produced with different types of reinforcing particles like SiC [7,20], TiC [21], Al 2 O 3 [22], CNT [23][24][25], TiO 2 [26], and B 4 C [27].…”

Section: Introductionmentioning

confidence: 99%

The effect of reinforcement type on the microstructure, mechanical properties, and wear resistance of A356 matrix composites produced by FSP

Shojaeefard

Akbari

Asadi

et al. 2016

Int J Adv Manuf Technol

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Fabrication of particle-reinforced aluminum matrix composites has been pursued with a keen interest recently. However, a comparison of the effect of different reinforcements on the mechanical properties and wear resistance of A356 matrix composites fabricated by FSP is of great interest to be considered. In the present work, the microstructural, mechanical, and wear properties of A356 matrix composites reinforced by SiC, TiC, ZrO 2 , and B 4 C particles are investigated. Moreover, the effect of pin profile on distribution of reinforcing particles in the stir zone of the FSPed specimens is investigated. Hardness and wear tests are performed in order to investigate mechanical and wear properties of the composites. The composite reinforced by TiC particles exhibits higher hardness value compared with other reinforcements due to the excellent bonding between TiC and metal matrix as well as higher hardness value of reinforcement itself than other reinforcements. Moreover, wear test results show that the wear resistance of the composite is significantly improved compared with that of the base metal.

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“…The welding parameters were found to influence microstructure, penetration, void formation, and tool wear. Shojaeefard et al [15] worked on Friction Stir Welds of AA1100.…”

Section: Introductionmentioning

confidence: 99%

Genesis of Microstructures in Friction Stir Welding of Ti-6Al-4V

Tchein

Jacquin

Coupard

et al. 2018

Metall Mater Trans A

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This paper is focused on the genesis of microstructures in Friction Stir Welding (FSW) of the Ti-6Al-4V alloy. Several titanium joints, initially prepared with 4 different pre-heat treatments, were processed by FSW. Detailed microstructural analyses were performed in order to investigate change in the microstructure during the process. In this work, the FSW processing allows a controlled and stable microstructure to be produced in the stirring zone, regardless of the initial heat treatment or the welding conditions. The welded material undergoes a severe thermo-mechanical treatment which can be divided into two steps. First, the friction in the shoulder and the plastic strain give rise to the necessary conditions to allow a continuous dynamic recrystallization (CDRX) of the β phase. This operation produces a fine and equiaxed β grain structure. Second, once the pin has moved away, the temperature decreases and the material undergoes a heat treatment equivalent to air quenching. The material thus exhibits a β→β+α transformation with germination of a fine intergranular Widmanstätten phase within the ex-fully-recrystallized-β grains.

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Optimization of microstructural and mechanical properties of friction stir welding using the cellular automaton and Taguchi method

Cited by 58 publications

References 19 publications

A Combined Method to Model Dynamic Recrystallization Based on Cellular Automaton and a Phenomenological (CAP) Approach

A Combined Method to Model Dynamic Recrystallization Based on Cellular Automaton and a Phenomenological (CAP) Approach

The effect of reinforcement type on the microstructure, mechanical properties, and wear resistance of A356 matrix composites produced by FSP

Genesis of Microstructures in Friction Stir Welding of Ti-6Al-4V

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