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

Article dans une revue avec comité de lecture
Auteur
TCHEIN, Gnofam Jacques
JACQUIN, Dimitri
ccCOUPARD, Dominique
LACOSTE, Eric
ccGIROT, Franck
449694 Ikerbasque - Basque Foundation for Science

URI
http://hdl.handle.net/10985/17328
DOI
10.1007/s11661-018-4568-5
Date
2018
Journal
Metallurgical and Materials Transactions A

Résumé

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 four different preheat 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 thermomechanical 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 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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I2M_MMTA_2018_COUPARD.pdf
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  • Institut de Mécanique et d’Ingénierie de Bordeaux (I2M)

Documents liés

Visualiser des documents liés par titre, auteur, créateur et sujet.

  • Analytical modeling of hot behavior of Ti-6Al-4V alloy at large strain 
    Article dans une revue avec comité de lecture
    TCHEIN, Gnofam Jacques; JACQUIN, Dimitri; ALDANONDO, Egoitz; ccCOUPARD, Dominique; GUTIERREZ-ORRANTIA, Esther; ccGIROT, Franck; LACOSTE, Eric (Elsevier, 2019)
    Hot deformation behavior of the Ti-6Al-4V alloy is studied through hot torsion tests. Cylindrical samples are twisted at different strain rates and temperatures in the β phase domain. The recorded torque vs twisting angle ...
  • Strain field measurement in orthogonal machining of a titanium alloy 
    Article dans une revue avec comité de lecture
    ccCALAMAZ, Madalina; ccCOUPARD, Dominique; ccGIROT, Franck (Trans Tech Publications, 2012)
    Improving the cutting processes by optimizing operating parameters necessarily involves understanding the thermo-mechanical mechanisms generated during chip formation. For this, numerical simulations are used to obtain ...
  • A new material model for 2D numerical simulation of serrated chip formation when machining titanium alloy Ti-6Al-4V 
    Article dans une revue avec comité de lecture
    ccCALAMAZ, Madalina; ccCOUPARD, Dominique; ccGIROT, Franck (Elsevier, 2008)
    A new material constitutive law is implemented in a 2D finite element model to analyse the chip formation and shear localisation when machining titanium alloys. The numerical simulations use a commercial finite element ...
  • Toward a better understanding of tool wear effect through a comparison between experiments and SPH numerical modelling of machining hard materials 
    Article dans une revue avec comité de lecture
    ccCALAMAZ, Madalina; LIMIDO, Jérôme; NOUARI, Mohammed; ESPINOSA, Christine; ccCOUPARD, Dominique; SALAUN, Michel; ccGIROT, Franck; CHIERAGATTI, Rémy (Elsevier, 2009)
    The aim of this study is to improve the general understanding of tungsten carbide (WC–Co) tool wear under dry machining of the hard-to-cut titanium alloy Ti6Al4V. The chosen approach includes experimental and numerical ...
  • Numerical simulation of titanium alloy dry machining with a strain softening constitutive law 
    Article dans une revue avec comité de lecture
    ccCALAMAZ, Madalina; ccCOUPARD, Dominique; ccGIROT, Franck (Taylor & Francis, 2010)
    In this study, the commercial finite element software FORGE2005, able to solve complex thermo-mechanical problems is used to model titanium alloy dry machining. One of the main machining characteristics of titanium alloys ...

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