On the effect of incremental forming on alpha phase precipitation and mechanical behavior of beta-Ti-10V-2Fe-3Al (bibtex)

by S. Winter, M. F.-X. Wagner

@Article{WinterWagner2016,
  Title                    = {On the effect of incremental forming on alpha phase precipitation and mechanical behavior of beta-Ti-10{V}-2{F}e-3{A}l},
  Author                   = {Winter, S. and Wagner, M. F.-X.},
  Journal                  = {{IOP} Conf. Ser.: Mater. Sci. Eng.},
  Year                     = {2016},

  Month                    = {mar},
  Pages                    = {012026},
  Volume                   = {118},

  Abstract                 = {A combination of good ductility and fatigue resistance makes β-titanium alloys interesting for many current and potential future applications. The mechanical behavior is primarily determined by microstructural parameters like (beta phase) grain size, morphology and volume fraction of primary / secondary α-phase precipitates, and this allows changing and optimizing their mechanical properties across a wide range. In this study, we investigate the possibility to modify the microstructure of the high-strength beta titanium alloy Ti-10V-2Fe-3Al, with a special focus on shape and volume fraction of primary α-phase. In addition to the conventional strategy for precipitation of primary α, a special thermo-mechanical processing is performed; this processing route combines the conventional heat treatment with incremental forming during the primary α-phase annealing. After incremental forming, considerable variations in terms of microstructure and mechanical properties can be obtained for different thermo-mechanical processing routes. The microstructures of the deformed samples are characterized by globular as well as lamellar (bimodal) α precipitates, whereas conventional annealing only results in the formation of lamellar precipitates. Because of the smaller size, and the lower amount, of α-phase after incremental forming, tensile strength is not as high as after the conventional strategy. However, high amounts of grain boundary α and lamellar α\textsubscript{p}-phase in the undeformed samples lead to a significantly lower ductility in comparison to the matrix with bimodal structures obtained by thermo-mechanical processing. These results illustrate the potential of incremental forming during the annealing to modify the microstructure of the beta titanium Ti-10V-2Fe-3Al in a wide range of volume fractions and morphologies of the primary α phase, which in turn leads to considerably changes, and improved, mechanical properties.},
  Doi                      = {10.1088/1757-899x/118/1/012026},
  Publisher                = {{IOP} Publishing},
  Url                      = {http://dx.doi.org/10.1088/1757-899X/118/1/012026}
}