Short Communication
Mechanics of Solids

Mathematical model of creep and creep rupture strength for hydrogen-charged VT6 titanium alloy at a temperature of 600 $^\circ$C

V. P. Radchenko, E. A. Afanaseva, M. N. Saushkin

Samara State Technical University, Samara, 443100, Russian Federation

Abstract: A mathematical model is proposed for predicting the creep and creep rupture strength of the hydrogen-charged VT6 titanium alloy at a temperature of 600 $^\circ$C. A method for identifying the model parameters has been developed based on data from steady-state creep curves at fixed stress levels and hydrogen concentrations. Creep curves and time to rupture have been calculated for the VT6 alloy at $T=600$ $^\circ$C. The adequacy of the model was verified by comparison with experimental data as well as with the results of independent calculations using alternative models. It is shown that the model provides satisfactory prediction accuracy even with significant inherent scatter in the experimental data. Based on the analysis of the identified model parameters, the influence of hydrogen concentration on the rheological properties and fracture mechanism of the material has been investigated, revealing partial embrittlement and a substantial change in nonlinearity indices.

Keywords: creep, creep rupture strength, VT6 titanium alloy, hydrogen charging, prediction, rheological model, parameter identification

UDC: 539.434.2:669.295:519.6

MSC: 74C10

Received: July 11, 2025
Revised: September 18, 2025
Accepted: October 20, 2025
First online: December 5, 2025

DOI: 10.14498/vsgtu2256

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