The Effect of Cold Rolling on Mechanical Properties of Zircaloy-4

Year 2017, Volume: 1 Issue: 1, 29 - 35, 29.11.2017

Semih Ağca Güven Çankaya

Abstract

In this study, Zircaloy-4 rods are heat treated
and cold rolled to different (15%, 30%, 45%, 60%, and 75%) reduction ratios to
determine the effect of heat treatment and cold rolling on micro and nano scale
mechanical properties of Zircaloy-4. Micro scale mechanical properties are
investigated by micro Vickers hardness tester and nano scale mechanical
properties are studied by universal mechanical tester (UMT). Fracture surfaces
of samples are illustrated by scanning electron microscope (SEM). Microstructure
of samples are evaluated by optical microscope. It is found that hardness
increased with increasing cold rolling reduction ratio both in micro and nano
scale. Nano scale measurements showed that the elastic modulus is increased
with increasing reduction ratio. Increase in hardness and elastic modulus
altered the fracture from ductile to brittle. Fracture mode for samples are
determined as mixed mode.  

Keywords

Zircaloy-4, UMT, cold rolling, mechanical properties

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