[Back]

F. Warchomicka, M. Stockinger, C. Poletti:
"Characterization of the microstructure evolution of near beta titanium alloys during hot deformation";
Talk: Praktischen Metallographie, Jena, Deutschland; 09-17-2008 - 09-19-2008; in: "Sonderbände der Praktischen Metallographie", G Petzow (ed.); "Fortschritte in der Metallographie", Mat Info / Werstoff-Informationsgesselschaft, 40 (2008), ISBN: 3-88355-370-0; 249 - 254.

Near β titanium alloys seem to be on a gradual increase for structural applications in the aerospace industry because they exhibit relatively good workability due to the low beta transus temperature, deep hardenability and good corrosion resistance. They reach strength values close to those of steel depending on the microstructure obtained during the thermomechanical process. In this work a quantitative analysis of the microstructural changes in two near β alloys (Ti-5Al-5Mo-5V-3Cr-1Zr and Ti-10V-2Fe-3Al) during hot deformation in the α+β field near to the transus temperature is presented. Microstructural features such as shape and maximum lengths of α grains are measured by SEM/BSE from specimens with different grades of deformation at strain rates of 0.01 and 1/s. The α grains orient more perpendicular to the compression load with increasing deformation. A fragmentation of the α grain chains followed of a globularization is observed at 0.01/s in Ti-10V-2Fe-3Al. Refinement of β subgrains is observed at high strain rates. Formation of new β grains are determined by EBSD. The changes of the microstructure of these two-phase materials are presented as function of temperature, deformation degree and rate.

Hot Deformation, Titanium alloys, quantitative analysis

http://publik.tuwien.ac.at/files/PubDat_170299.pdf