A Metrology Approach to Unifying Rockwell C Hardness Scales
Jun-Feng Song, J Smith, Theodore V. Vorburger
Current Rockwell C hardness scales (HRC) are unified by performance comparisons. Unless a reliable metrology approach is used for the direct verification of standard hardness machines and diamond indenters, the unified hardness scale may exhibit a systematic offset from the true value of the hardness scale. Based on the recently developed NIST microform calibration system, a metrology approach is suggested to unify Rockwell C hardness scales. The true value and reference-value scales are defined. It is proposed to use the reference standards, including standard hardness machines and NIST standard-grade Rockwell diamond indenters, to create, maintain, and reproduce the reference-value scale for the metrology-based Rockwell hardness standard system, and to overcome the systematic offset in existing performance-based hardness scales.
Proceedings of the 9th International Symposium on Hardness Testing in Theory and Practice
, Smith, J.
and Vorburger, T.
A Metrology Approach to Unifying Rockwell C Hardness Scales, Proceedings of the 9th International Symposium on Hardness Testing in Theory and Practice, Dusseldorf, 1, GE
(Accessed June 1, 2023)