Transformation kinetics and microstructures of Ti17 titanium alloy during continuous cooling

Julien da Costa Teixeira (1) , Benoit Appolaire (1) , Elisabeth Aeby-Gautier (1) , Sabine Denis (1) , Georges Cailletaud (2) , N. Spath (3)

1 LSG2M - Laboratoire de Science et Génie des Matériaux et de Métallurgie
2 CDM - Centre des Matériaux
3 SNECMA Gennevilliers [Colombes]

We have investigated the microstructure evolutions in the Ti17 near Click to view the MathML source titanium alloy during heat treatments. The phase transformation has first been studied experimentally by combining X-ray diffraction analysis, electrical resistivity and microscopy observations. From a series of isothermal treatments, a IT diagram has been determined, which takes into account the different morphologies. Then, a Johnson–Mehl–Avrami–Kolmogorov (JMAK) model has been successfully used to describe the phase transformation kinetics during either isothermal or cooling treatments. Finally, the coupling of the JMAK model to the finite element software ZeBuLoN allowed us to investigate the evolution of the spatial distribution of the different morphologies during the cooling of an aircraft engine shaft disk after forging.

Domaines: Science des matériaux [cond-mat.mtrl-sci]

Julien da Costa Teixeira, Benoit Appolaire, Elisabeth Aeby-Gautier, Sabine Denis, Georges Cailletaud, et al.. Transformation kinetics and microstructures of Ti17 titanium alloy during continuous cooling. Materials Science and Engineering: A, 2007, 448, pp.135-145. ⟨10.1016/j.msea.2006.10.024⟩. ⟨hal-00134489⟩