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Effects of new thermomechanical treatment, which includes consecutive solid solution, cold deformation and rapid recrystallization (SSCDRR), and final aging on microstructure and mechanical properties of the Ti-4.5Fe-7.2Cr-3.0Al alloy was investigated employing optical and electron transmission microscopy, tensile and fatigue testing. Beta grain size fell below 100 μm by hot deformation at a temperature within the two-phase α + β field and subsequent rapid heating up to 1123 K at 20 Ks - 1 . Further refinement of β grain microstructure up to average grain size of about 7 μm become possible by cold deformation and rapid heating up to 1013-1043 K at 20 Ks - 1 or 1023-1063 K at 50 Ks - 1 . Tensile strength of the fine β-grain specimens increased by aging, up to 1840-1412 MPa while ductility can be varied within rather wide range by changing β-grain size as a result of controlled SSCDRR. Thus, the desired balance between strength and ductility may be achieved by optimizing treatment parameters.

Balancing of Mechanical Properties of Ti&ndash;4.5Fe&ndash;7.2Cr&ndash;3.0Al Using Thermomechanical Processing and Rapid Heat Treatment

Balancing of Mechanical Properties of Ti–4.5Fe–7.2Cr–3.0Al Using Thermomechanical Processing and Rapid Heat Treatment