METHOD AND DEVICE FOR CONTINUOUS EVALUATION OF MECHANICAL AND MICROSTRUCTURAL PROPERTIES OF METAL MATERIAL, IN PARTICULAR STEEL, DURING COLD DEFORMATION Russian patent published in 2022 - IPC G01N3/28 

FIELD: metallurgy.

SUBSTANCE: invention relates to the continuous evaluation of mechanical and microstructural properties of metal material during cold deformation. Measurements of characteristic parameters of the cold deformation process are carried out under dynamic conditions, including at least one value of temperature (T), deformation (ε) and deformation rate () of a rolled sheet (L). Additionally, the yield strength is calculated under tension with a high deformation rate in accordance with the equation (I), where σ_с is the compressive strength of the rolled sheet (L), when a compressive force (Fc) is applied to it; σ_t is the tensile strength of the rolled sheet (L), when tensile forces are applied to it (T_in, T_out); σ_bend is the tensile strength of the rolled sheet (L) when bending, when a bending moment is applied to it; and m, n, p are the first, the second and the third parameters, respectively, which are a function of continuously measured operating parameters of the cold deformation process and a function of the rolled sheet (L) relatively to its chemical composition and previous operating parameters of the hot deformation process relatively to the initial and final temperature of hot rolling, temperature of winding into a roll and grain size; the yield strength at low deformation rate (σ_YS) is calculated in accordance with the equation (II), where: σ_YD is the yield strength at high deformation rate; f is a statistical optimization coefficient for data measured at low deformation rate and at high deformation rate; α is the first characteristic parameter of the rolled sheet (L), which is a function of the chemical composition of the rolled sheet (L) and operating parameters of the hot deformation process of the rolled sheet (L); and β is the second characteristic parameter of the rolled sheet (L), which is a function of the cold deformation process, calculated by the equation (III), where is the deformation rate, Q is the activation energy of the deformation of the rolled sheet (L), estimated by laboratory tests, R is the Boltzmann constant for ideal gases, and T is the temperature of the rolled sheet (L). The device contains: first means (10, 20) of applying, modulating and measuring deforming forces, first means (9) of measuring deformation, connected to first means (10, 20) of applying, modulating and measuring, second means (10') of applying, modulating and measuring deforming forces, second means (9') of measuring the deformation of the rolled sheet (L) after the specified application of deforming forces at a low deformation rate, connected to second means (10') of applying, modulating and measuring, means (16) of calculating mechanical and microstructural properties of the rolled sheet (L), connected to first and second means (9, 9') of measuring and made with the possibility of implementing a method for evaluating mechanical and microstructural properties of rolled metal material, and means (25) of correlating data measured at high strain rate and at low strain rate.

EFFECT: possibility to continuously perform necessary measurements in the production process, allowing to evaluate mechanical and microstructural properties of rolled metal material.

14 cl, 4 dwg