Abstract
This paper presents the technique with which Low frequency thermal cycling tests were carried out on two carbon steel. The steels used are low and medium carbon steel, the compositional analysis was done to ascertain the percentage of carbon the as-received materials contain, and the micrograph of the samples was done using acuscope photomicrograph with a magnification of X400. The heating of the samples was done in a carbon muffle furnace and the test was done at predetermined ranges of thermal cycling temperatures. The specimen were machined to a precise gage length and diameter and the test was performed with the use of Avery Dennison (Avery model 7305) which has a curve with which the relationship between the dial gage reading and the imposed torque was established. The results obtained from the machine were the readings for maximum bending moment and cycles to failure, which were converted to get the applied bending stress. On the final analysis medium carbon steel prove to be a suitable material for design of machine that could undergo thermal cycling in service condition beyond 230°C.
Highlights
Steel is an alloy of iron and carbon that has been in used for various constructions ranging from structural to mechanical do experience various types of failures in service amongst is fatigue
There are many forces that causes fatigue failure to a material in service, they are numerous, but few shall be mentioned in this paper, some of which are vibrations and thermal, thermal cycling will be discussed
Fatigue failure is becoming progressively more prevalent as technology is advancing and rolling out equipment such as automobiles, aircrafts, compressors, pumps turbines boiler and a host of others subjected to repeated loading and vibration, until today
Summary
Steel is an alloy of iron and carbon that has been in used for various constructions ranging from structural to mechanical do experience various types of failures in service amongst is fatigue. Fatigue failure is a phenomenon that leads to fracture under repeated or fluctuating stresses that are less than the tensile strength of the material. Medium carbon steels find wide applications in the manufacture of low cost gears, axles, shafts, fasteners and other similar components ([1] and [2]). These components do have high strength together with adequate toughness to give resistance to crack propagation and the measure of resistance to crack propagation is termed as fracture toughness [3]
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