MET225 Lab 7 Hardness Test.docx - Experiment Lab 7 Hardness...

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Experiment Lab 7 - Hardness Testing MET 225 July 18th, 2021 Prepared By Dunthyon Schroeder [email protected] Old Dominon University Nathan Luetke/Emilie Martin MET225
Experiment 7 Hardness Test Purpose: The purpose of a hardness test is to determine the strength, ductility, and wear resistance. A hardness test is typically performed by pressing a specifically dimensioned and loaded object (indenter) into the surface of the material you are testing. The hardness is determined by measuring the depth of indenter penetration or by measuring the size of the impression left by an indenter. The Rockwell hardness test is a macro scale hardness test that uses a 1/16” ball or a diamond tipped indenter. A macro hardness test is done when the load is higher than 1kgf. Theoretical Considerations: Hardness testing can’t be used for design purposes, but it is important to keep in mind when comparing materials strength or when considering wear like water erosion or metal to metal erosion. Hardness between different materials is an unusable factor as well, as comparing plastic to steel or copper to gold is going to give numbers that don’t really compare. Steel to heat treated / oil quenched steel will however, provide a much better basis of comparison as they’re the same metal with different treatments.

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