METHOD OF DETERMINING LOCAL CONCENTRATION OF RESIDUAL MICROSTRESS IN METALS AND ALLOYS Russian patent published in 2010 - IPC G01N23/207 

FIELD: physics.

SUBSTANCE: method of determining local concentration of residual microstress in metals and alloys localised in micro-regions of the order of 1 micrometre involves obtaining an intensity distribution curve of the interference line of indices in long-range orders - large Vulf-Bragg angles on the X-ray diffractometre for the analysed material in point by point calculation mode or in diffractogram recording mode. The diffractogram is processed: drawing the background line, determination of the position of the 2θ_max position and drawing the medial line. The area of cut off peripheral sections (S₁ and S₂) and the total area (S_tot) of the diffractogram are measured. The local concentration value of residual microstress ratio (δ%) is then determined using the expression

EFFECT: evaluation of the local concentration value of residual microstress on the basis of which susceptibility of steel and alloys to brittle failure and service life of components and articles are determined.

10 dwg, 4 ex