Enhanced thermo-mechanical processing through stress-induced martensitic transformation and its effect on grain refinement in metastable β titanium alloys. (15th March 2023)

• Record Type: Journal Article
• Authors: Rastogi, Abhishek; Neelakantan, Suresh
• Is Part Of: Scripta materialia. Number 226(2023)
• Publication Date: 2023-03-15
• Subjects: Titanium alloys -- Thermomechanical processing -- Martensitic transformation -- Grain refinement -- Microindentation; SIMT Stress-induced martensitic transformation -- TRIP Transformation-induced plasticity -- TWIP Twinning-induced plasticity -- Ti-1023 Ti-10V-2Fe-3Al -- Ti-5553 Ti-5Al-5V-5Mo-3Cr -- TMP Thermomehcanical processing -- SIM Stress-induced martensite -- XRD X-ray diffraction -- EBSD Electron backscatter diffraction -- EPMA Electron probe micro-analyzer -- WQ Water quenching -- Ti-4733 Ti-4Al-7Mo-3V-3Cr; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2022.115222
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Stress-induced transformations in retained metastable phase are known deformation mechanisms that provide additional plasticity in several alloy systems. In the present study on metastable β Ti-10V-2Fe-3Al (Ti-1023) and Ti-5Al-5V-5Mo-3Cr (Ti-5553) alloys, stress-induced martensitic transformation (SIMT) has been effectively demonstrated to result in achieving a noticeable cold reduction of ∼43% and ∼45%, respectively. A significant fraction of stress-induced α ″ martensites provide preferential nucleation sites for new strain-free grains formation upon recrystallization annealing. The thermomechanical treatment resulted in grain refinement by ∼93% and ∼80%, respectively, for Ti-1023 and Ti-5553 alloys. Electron Probe Micro Analyzer (EPMA) confirms the role of alloying element (such as Fe, Mo, V, Cr and Al) diffusivities resulting in altering the stability of the β phase as a function of recrystallization annealing time. Further, the effect of grain size on the SIMT ability based on microhardness variations has been deduced. Graphical abstract: Image, graphical abstract