Coordination of structure characteristics and structural strength of titanium alloys of martensitic and transitional classes

Abstract

Various structural states and characteristics of the structural strength of titanium alloys have been investigated in a wide range of properties. Relationships of the influence of microstructure indices of titanium alloys of martensitic and transitional classes on representative characteristics of structural strength are established. Among them: ultimate plasticity, uniform plasticity, Ilyushin’s modulus, which comprehensively characterizes the degree of hardening of a material, its strength and plasticity margin, coefficient of strain hardening, resistance to separation and static crack resistance of high-strength titanium alloys in the following technological states: disk of a high-pressure stage of a GTE compressor, forging, stamping and samples after surface impact hardening by laser. The obtained dependences are characterized by an adequate and stable regression relationship between the sizes of the phases of the microstructure and properties, which makes it possible to choose alloys and substantiate effective technologies for their processing. As parameters of the structure, reflecting the essence of the influence of the composition of titanium alloys and processing technology (rolling, forging, stamping and heat treatment) on the performance of alloys, the ratio of the sizes of the initial and converted low-temperature component – ? of the solid solution is proposed. The proposed direct (linear) and power-law dependences of properties on the parameters of the structure of titanium alloys make it possible to expedite the substantiation of the modes of their technologies, significantly reducing the amount of experimental confirmation of consistency and optimality.