Friction Stir Radial Backward Extrusion (FSRBE) as a new grain refining technique

• Autorzy: Jafarzadeh H. , Babaei A. , Esmaeili-Goldarag F.

Identyfikatory

DOI

10.1016/j.acme.2018.04.006

• Języki publikacji: EN

Abstrakty

EN

A new method entitled Friction Stir Radial Backward Extrusion (FSRBE) is presented for processing fine-grained tubes. In FSRBE technique, an initial pure copper billet is placed inside a cylindrical chamber. The billet is pushed toward a rotating tool which results in radial and backward flow of the material while is frictionally stirred. The microstructure evolution during FSRBE was investigated through experimental observations and cellular automaton (CA) modeling. The observations reveal that the microstructure with initial grain size of 75 μm was refined to a fine-grained structure with an average grain size of 12 μm. The results of tensile tests demonstrate slight improvement in the value of yield and ultimate strength, elongation and microhardness. The microstructural evolution during FSRBE processing in the micro-level was studied using a coupled cellular automaton algorithm and finite element model. First, the macroscopic plastic flow behavior of material during FSRBE was calculated using FEM simulation method. Next, by tracing the plastic strain, the strain rate and temperature, in the deformation domain of cellular automaton, the DRX kinetics of pure copper is obtained in a devised post-processing step. The microstructure observations showed that the proposed model predictions were in reasonably good agreement with the experimentally obtained results.

Słowa kluczowe

EN

friction stir; extrusion; fine-grained structure; microstructure modeling; cellular automaton

PL

tarcie; promieniowanie; struktura drobnoziarnista; mikrostruktura; automat komórkowy

• Wydawca: Springer ; Wrocław University of Science and Technology
• Czasopismo: Archives of Civil and Mechanical Engineering
• Rocznik: 2018
• Tom: Vol. 18, no. 4
• Strony: 1374--1385
• Opis fizyczny: Bibliogr. 41 poz., rys., wykr.

Twórcy

autor

Jafarzadeh H.

• Department of Mechanical Engineering, Tabriz Branch, Islamic Azad University, Tabriz, Iran

autor

Babaei A.

• Department of Mechanical Engineering, University College of Nabi Akram[4TD$DIF] (UCNA), Tabriz, Iran

autor

Esmaeili-Goldarag F.

• Department of Mechanical Engineering, University College of Nabi Akram[4TD$DIF] (UCNA), Tabriz, Iran

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Uwagi

PL

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019)