Development of Usage of Brinell Hardness Test Method for Flow Stress Definition during Cold Deformation  Full text 

A.V. Grushko

Vinnytsia NTU

UDC 620.178.152.28

Metall. Min. Ind.,  2012, Vol. 5, No. 1, pp. 11-16

Abstract

In this article a method of construction of ferrous metals flow curve for flow stress definition with Brinell hardness tester is represented. The flow curve is approximated with a power function by P. Ludwig. Equations relating hardness by Brinell and the flow curve are obtained by finite element method simulation. According to the method it is necessary to make two measurements of hardness at loads of 29.43 kN and 2.453 kN on ball indenter with a diameter of 0.010 m. The unknown coefficients are hardening and strength coefficients, which are found by solving a system of nonlinear equations.

Keywords: FLOW CURVE, POWER FUNCTION, HARDNESS, BALL INDENTATION, BRINELL, FINITE ELEMENT METHOD