CIVL2110 – Materials Executive Summary, 2017
1. INTRODUCTION AND OBJECTIVES
The two experiments conducted were designed to observe the process of phase
transformation and provide insight into the properties of different phases in steel.
Experiment one involved heating a wire of eutectoid (0.76 C wt.%) steel to reveal the
effect of phase transformation on the elongation of the wire. Theoretically, on heating
the wire to 723
C, the wire undergoes a eutectic phase transformation from pearlite to
austenite, altering its crystal structure and density. By tracking the elongation, one is
able to observe the phase transformation that occurs, and how this changes the length.
Experiment two tested the hardness of various steel specimens with different
microstructures. These results were used to provide insight into the material properties
of these microstructures, the effects of different tempering methods on steels, and of
changing the weight percentage of carbon.
Understanding different phases, microstructures, and how these are affected by
tempering is critical for engineers. Being able to manipulate the various properties of
different steel phases allows for more design versatility, and the ability to safely create
materials assured to be of certain hardness, strength and ductility.
2. EXPERIMENT ONE
Experiment one was conducted using a 2m (approximate) steel wire, two bolted wall
supports, electrical wires, a generator, a suspended weight and a 1m ruler.
The steel wire was suspended from the supports. Electrical wires were attached to the
cable and generator using steel clips. The weight was attached midway along the wire,
and the ruler balanced vertically behind it (see Figure 1).
Schematic Diagram of Experiment