METHOD FOR DETECTION OF CRITERION OF METAL AND ALLOY RESISTANCE TO BRITTLE FRACTURE Russian patent published in 2010 - IPC G01N23/20 

FIELD: measurement equipment.

SUBSTANCE: application: to detect criterion of metal and alloy resistance to brittle fracture. Detection of criterion of metal and alloy resistance to brittle fracture is carried out by assessment of values of local concentration of residual microstresses, which are localised in microareas of order 1 mc, for this purpose curve of long-range orders - high angles of Wulff-Bragg interferential line intensity distribution is obtained on X-ray diffractometre, background line is marked, 2θ_max of curve is defined, and height of maximum is built, middle line is marked at the middle of height 2θ_max, which defines width of interferential line, upper side branches are continued from the point of their crossing with middle line to line of background, areas of cut peripheral sections (S₁ and S₂) are measured, as well as overall area of diffraction pattern S_overall, ratios (δ%) are defined between sum of cut sections to overall area , which characterise value of local concentration of microstresses, which is a structural-sensitive characteristic, besides value of local concentration of microstresses δ% is detected previously for reference condition of material, and material inclination to brittle fracture is identified by comparison of produced values, and criterion of investigated material resistance to brittle fracture is accepted as minimum value δ%, which characterises most balanced structural condition of material.

EFFECT: provision of possibility to detect criterion of metal and alloy resistance to brittle fracture by X-ray methods.

2 cl, 80 dwg, 3 ex