Essay On Hardness Test

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Abstract
Various samples of steel where tested for both hardness and toughness. Hardness was measured using three types of hardness test; the Brinell, Vickers and Rockwell C, and toughness was measured using a Charpy Impact test. The samples consisted of steel of both different carbon content and treatment. It was found that steel with lower carbon content were harder but less tough than steel with higher carbon content. It was also shown that heating and quenching resulted in an increase in hardness but decrease in toughness, however this brittleness could be offset somewhat by tempering the metal after hardening.

Introduction
Understanding material properties is of vital importance in engineering. It is preposterous to build a bridge, a building or even an artificial limb
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These values were recorded and the average of them was found.
• The Vickers hardness value was found by reading the correspond value to the average diagonal length off of a chart.
Brinell Hardness Test The Brinell hardness test uses a small 10mm diameter steel ball and a load of 3000kg to form a dent in the sample. It is held in place for a preselected time and then removed. The diameter of the resulting impression is then measured and a chart is consulted to find the corresponding Brinell hardness value. The standard procedure is found in ASTM E10. In the procedure used in the laboratory is as follows, the hardened and quench and hardened, quench and tempered where not tested as they were too hard for the steel ball used in the test:
• The samples where sanded smooth and placed on the testing platform under the indenter.
• The indenter and load where applied to the sample and left for 15 seconds.
• The load and indenter was removed and the indent formed was measured using a measuring eyepiece. Two measurements of the diameter taken and then the average was found and

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