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Predicting the available work from deformation-induced α′′ martensite formation in metastable β Ti alloys

Journal Article


Abstract


  • Deformation-induced α′′ martensite formation is essential to the mechanical properties of a variety of metastable β Ti alloys by extending elasticity or contributing to work-hardening during plastic deformation. Nevertheless, to date, a comprehensive analysis of the effect of β texture and applied stress state on the martensitic transformation to α′′ is still lacking. The present study therefore provides a detailed analysis of the work which is made available from the shape strain of the martensitic transformation under a variety of in-plane stress states and as a function of β crystal orientation. The available work was found to strongly depend on the applied stress state and the parent grain orientation. The shape strain of the martensitic transformation was obtained from applying the phenomenological theory of martensite crystallography. In cases where this theory was not applicable, an approximation of the shape strain by the Bain strain was found to provide a good approximation of the available work. Analysis of three different metastable β Ti alloys showed no strong effect of the alloy composition on the available work. Martensite formation from typical cold- and warm-rolling β texture components under different stress states is discussed. Cases are highlighted to show how the cold- and warm-rolling β textures can be tailored to hinder martensite formation upon subsequent industrial forming operations.

Publication Date


  • 2020

Citation


  • Niessen, F., Pereloma, E. V., & Saleh, A. A. (2020). Predicting the available work from deformation-induced α′′ martensite formation in metastable β Ti alloys. Journal of Applied Crystallography, 53, 1015-1028. doi:10.1107/S1600576720007451

Scopus Eid


  • 2-s2.0-85093903438

Web Of Science Accession Number


Start Page


  • 1015

End Page


  • 1028

Volume


  • 53

Abstract


  • Deformation-induced α′′ martensite formation is essential to the mechanical properties of a variety of metastable β Ti alloys by extending elasticity or contributing to work-hardening during plastic deformation. Nevertheless, to date, a comprehensive analysis of the effect of β texture and applied stress state on the martensitic transformation to α′′ is still lacking. The present study therefore provides a detailed analysis of the work which is made available from the shape strain of the martensitic transformation under a variety of in-plane stress states and as a function of β crystal orientation. The available work was found to strongly depend on the applied stress state and the parent grain orientation. The shape strain of the martensitic transformation was obtained from applying the phenomenological theory of martensite crystallography. In cases where this theory was not applicable, an approximation of the shape strain by the Bain strain was found to provide a good approximation of the available work. Analysis of three different metastable β Ti alloys showed no strong effect of the alloy composition on the available work. Martensite formation from typical cold- and warm-rolling β texture components under different stress states is discussed. Cases are highlighted to show how the cold- and warm-rolling β textures can be tailored to hinder martensite formation upon subsequent industrial forming operations.

Publication Date


  • 2020

Citation


  • Niessen, F., Pereloma, E. V., & Saleh, A. A. (2020). Predicting the available work from deformation-induced α′′ martensite formation in metastable β Ti alloys. Journal of Applied Crystallography, 53, 1015-1028. doi:10.1107/S1600576720007451

Scopus Eid


  • 2-s2.0-85093903438

Web Of Science Accession Number


Start Page


  • 1015

End Page


  • 1028

Volume


  • 53