METHOD OF DETERMINING DEFECT STRUCTURE OF ROLLED TITANIUM Russian patent published in 2010 - IPC G01N29/11 

FIELD: physics.

SUBSTANCE: to set up sensitivity and checking working condition of a flaw detector, test sections of a bar of length 5, 250 and 500 mm, respectively, having controlled diametre with known coefficient of attenuation K_test of ultrasound at the frequency of the used transducer, made from material with the same composition as that of the controlled bar, having a given submicro-crystalline flawless internal structure, are used, wherein the diametre of the transducers must be in the range of 0.8-1 times the diametre of the rod; at the first step a conditional 'zero' is determined by measuring signal attenuation at the 5 mm long test section, further, the value of signal attenuation on 250 and 500 mm test sections is measured taking into account the conditional 'zero', the coefficient of attenuation K_test ¹ is then determined by calculating the ratio of signal attenuation at the test section of the bar to the length of that bar, the flaw detector is ready for operation if K_test ¹ determined by measuring each test specimen differs from K_test known for each test specimen by a value which does not exceed a tolerance level; further signal attenuation for the controlled bar is measured and the coefficient of attenuation K_cont for the said bar is calculated, from which the quality of the bar is determined.

EFFECT: simple method of determining crystallographic texture.

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