METHOD OF DETERMINING CONCENTRATION OF HYDROGEN IN TITANIUM ALLOY Russian patent published in 2024 - IPC G01N29/07 C22C14/00 

FIELD: measurement; non-destructive testing.

SUBSTANCE: invention relates to the field of non-destructive testing by means of ultrasonic waves and can be used for determination of hydrogen concentration in technical objects from titanium alloys. Method of determining hydrogen content in titanium alloy consists in excitation of surface wave pulses in analysed sample or article from titanium alloy, and hydrogen concentration in alloy is determined from parameters of their propagation. Spectral characteristics of surface wave pulses and acoustic structural noise are calculated. Shift of amplitude spectrum of pulses in hydrogenated alloy in comparison with initial one, change of relative energy of structural noise in relation to initial state of alloy is determined, and hydrogen concentration in alloy is determined from these characteristics. In order to reduce the amplitude spectrum shift value determination error, the frequency corresponding to the amplitude spectrum "centre of gravity" is used as the central spectral frequency, determined by means of software of the used measuring and computing system. In order to reduce the error in determining the value of noise energy, the energy spectrum is calculated using modified periodograms by Welch's method with a segment overlap of 75%. In order to reduce the error in determining hydrogen concentration, a combined calculation formula is used, which includes both proposed spectral parameters of surface wave pulses and acoustic structural noise.

EFFECT: high accuracy and information content of determining the value of hydrogen concentration in titanium alloys.

1 cl, 6 dwg