Flow Pattern in Torsionally Cold-Worked Mild Steel

Behaviors of over-strained metals (Report 3)

Abstract

In this paper an attempt is made to examine the physical meaning of the ultimate point always taken into consideration in the mechanical tension test of materials, on the view-point of the flow pattern appeared in excessively cold-worked mild steel. The synthesis is made under the following topics : 1. The forward necking in a tension test. 2. The flow pattern connected with the forward necking. 3. The flow pattern and the change of strain hardening rate in a torsion test. 4. The ultimate point and initiation of cracks. 5. Some features of the flow pattern : (a) the role of the grain boundary and pearlite in the flow pattern ; (b) the observation of slip bands concerned with the flow pattern.