Computational Modelling of Microstructural Deformation in Metastable β Titanium Alloys

Peter Christie* (Corresponding Author), Amir Siddiq, Robert McMeeking, Mehmet Kartal

*Corresponding author for this work

Research output: Contribution to conferenceAbstractpeer-review

Abstract

Metal forming is a manufacturing process in which a solid body is converted from an initial shape to a new one through mechanical deformation. Forming processes generally involve significant plastic deformation under complex multi-axial loading conditions. It is well known that metals can plastically deform via number of mechanisms: dislocation slip, twinning, the formation of stress/strain-induced martensite, or a combination of these. The interplay between the different deformation mechanisms significantly affects the mechanical behaviour of the metal.
Martensitic transformation can be regarded as a mode of deformation; one which causes a change in the crystalline structure. Martensite transformation is usually triggered by heat treatment when the parent phase passes through the transformation temperature (MS) and the driving force equals a critical value. The application of an externally applied stress can also trigger transformation, this is termed stress/strain-induced martensite (SIM). This type of martensitic transformation results in a more ordered microstructure. A microstructure generated by favouring the formation of martensite aligned with the applied loading. The exact deformation mechanisms for SIM; influence of different alloying elements; microstructural evolution; and the interaction between SIM, elastic/plastic deformation, and failure of the material is not fully understood and is still an active area of research [1]–[4].
In this study, a new CP-FEM formulation including SIM transformation along with conventional slip based plastic deformation is presented. The model is intended to investigate the interaction of SIM, slip-based plasticity, damage nucleation and growth in metastable 𝛽 titanium alloys. Providing insights into the influence SIM has on the bulk material response and microstructural evolution of metastable 𝛽 titanium alloys during metal forming processes.
Original languageEnglish
Publication statusPublished - 16 Apr 2021
EventUK Association of Computational Mechanics Conference - Loughborough University (virtual), Loughborough, United Kingdom
Duration: 14 Apr 202116 Apr 2021
https://www.ukacm2021.ukacm.org

Conference

ConferenceUK Association of Computational Mechanics Conference
Abbreviated titleUKACM 2021
CountryUnited Kingdom
CityLoughborough
Period14/04/2116/04/21
Internet address

Keywords

  • Metastable β titanium alloys
  • crystal plasticity
  • constitutive equations
  • phase transformation
  • stress/strain induced martensite

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