Визначення динамічної кривої зміцнення за вимірюванням твердості металу

Abstract

The purpose of the research is justify and develop a method for determining the parameter of speed strengthening of metallic material by measuring its static Brinell hardness and dynamic Leeb hardness. The method is based on the models obtained by finite elements and regression analysis. Dynamic strengthening curve is approximated with the three­parameter power function, which takes into account the dynamic component as indicator of the speed strengthening. Experimental verification is made for the following steels: ШХ15, Х18Н9Т, 20Х, Steel 20, Steel 45. Measurement of Leeb hardness is executed using portable hardness testers. Dynamic strengthening curve is constructed using a unique dynamic stand that provides different loading rates. The method of speed strengthening hardness indicator determination is experimental and calculated. It has satisfying sensitivity to the value of the dynamic Leeb hardness and can be used in case of impossibility to carry out the direct dynamic metal test.