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The scale of hardness by Rockwell scale - Lab Report Example

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The scale of hardness by Rockwell scale

Rockwell scale involves a scale of hardness that relies on hardness indentation of a material. This test is used to determine the extent of hardness through taking the measurements of the penetration depth of an indenter on a load that is large in comparison to the preload’s penetration. During testing, the hardness indentation is linearly correlated to the tensile strength. These traits are vital because they allow the non-destructive bulk metal testing to occur. The obtained data is consistent to the hardness tester calibrations. The experiment was done through performing the different tests on metals having the hardness that is known. There was a close similarity between the experimental values and the published values of hardness. From the results, it is evidenced that cast iron was the hardest material followed by 1018 steel, brass and lastly aluminium. Aluminium is considered to be relatively durable, soft, lightweight, malleable and ductile metal having an appearance that ranges from silver towards dull grey. Its appearance is dependent on the roughness surface. Aluminium is nonmagnetic and has a low potential for ignition. An aluminium fresh field acts as a good visible light reflector and a delightful reflector of far and medium infrared radiations. Pure aluminium has the yield strength of 7 to 11 MPa whereas its alloy has a yield strength of about 200MPa-600MPa. Studies conducted on the hardness of aluminium found out that aluminium ’s hardness is one third that of

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Material Experimental Published % Difference (+/-) Brass 71.5 69.4 2.1 Aluminum 48.8 40 8.8 1018 steel 92.3 98.7 -6.4 Cast Iron 97.9 100.8 -2.9 Graph: Average hardness values of four metals ordered like in table 1. Graph 2: average values versus published values of hardness. Discussion. The obtained data is consistent to the hardness tester calibrations. The experiment was done through performing the different tests on metals having hardness that is known. There was a close similarity between the experimental values and the published values of hardness. From the results, it is evidenced that cast iron was the hardest material followed by 1018 steel, brass and lastly aluminium. Aluminium is considered to be relatively durable, soft, lightweight, malleable and ductile metal having an appearance that range from silver towards dull gray. Its appearance is dependent on the roughness surface. Aluminium is nonmagnetic and has a low potential for ignition. An aluminium fresh field acts as a good visible light reflector and a delightful reflector of far and medium infrared radiations. Pure aluminum has yield strength of 7 to 11 MPa where as its alloy has a yield strength of about 200MPa-600MPa. Studies conducted on the hardness of aluminium found out that aluminium ’s hardness is one third that of steel. This research argued out that aluminium was less hard than steel. The hardness of cast iron was close to that of 1018 steel. On the other hand, the hardness of brass changes according to its treatment and preparation and treatment. The hardness will be high in the presence of cold work like swaging, rolling, and bending. The hardness may reduce whenever the annealation is done at temperatures that are elevated (Zhang 2). The acoustic and malleability

Summary

This paper explores a report on the use of the Rockwell test to determine the hardness of various materials. The key objectives of this experiment are: to establish the hardness measurements of aluminium, brass, steel, and iron, and to compare and contrast the hardness…
Author : fwalsh
The scale of hardness by Rockwell scale essay example
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