METHOD OF MECHANICAL TESTS OF METAL Russian patent published in 2017 - IPC G01N3/08 

FIELD: metal processing.

SUBSTANCE: invention relates to mechanical tests, designed to determine properties of metal during plastic deformation in process operations of cold metal forming by pressure (CMFP). Essence: stage cold deformation of tested sample is performed, at which circle limiting load-bearing surface of sample is transformed into ellipse, measuring of length of ellipse axes after each loading, determination of main deformation and deformation intensity ε_i, measurement of Vickers hardness (HV) and determining the relationship between deformation intensity ε_i and hardness HV as a result of approximation of graphical relationship between above parameters in accordance with formula HV = Nε_iⁿ, where n is coefficient, numerical values of which reflect susceptibility of tested metal to cold deformation, and coefficient N determines hardness HV, acquired by metal after deformation with intensity ε_i=1. Tests are performed on sample, made in form of cylinder, deformation is performed by compression, wherein length of axes of ellipse is measured after each next sample deformation.

EFFECT: technical result is expansion of technological capabilities of method by determining susceptibility to cold-hardening of metal produced in bars with diameter less than 15 mm, used in cold volume deformation.

1 cl, 2 dwg, 2 tbl