Hardness testing, which began in the 1700s with Mohs’ scratch test for minerals, evolved significantly by the early 1900s to focus on measuring the penetration of indenters under force. This shift led to the widespread adoption of three key methods—Brinell, Rockwell, and Vickers—standardized by ASTM International between 1924 and 1952.
Portable Hardness Test Methods and When to Use Them
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