Features of Heat Treatment the Ti-6Al-4V GTD Blades Manufactured by DLD Additive Technology

Materials (Basel). 2021 Jul 27;14(15):4159. doi: 10.3390/ma14154159.


Additive manufacturing of titanium alloys is one of the fastest growing areas of 3D metal printing. The use of AM methods for parts production in the aviation industry is especially promising. During the deposition of products with differently sized cross-sections, the thermal history changes, which leads to non-uniformity of the structure and properties. Such heterogeneity can lead to failure of the product during operation. The structure of deposited parts, depending on the thermal cycle, may consist of α', α + α' + β', and α + β in different ratios. This problem can be solved by using heat treatment (HT). This paper presents research aimed towards the determination of optimal heat treatment parameters that allows the reception of the uniform formation of properties in the after-treatment state, regardless of the initial structure and properties, using the example of a deposited Ti-6Al-4V gas turbine blade.

Keywords: Ti-6Al-4V; annealing; direct energy deposition; microstructure; phase composition; tensile properties; thermal history.