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A Metrology Approach to Unifying Rockwell C Hardness Scales

Published

Author(s)

Jun-Feng Song, J Smith, Theodore V. Vorburger

Abstract

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 Title
Proceedings of the 9th International Symposium on Hardness Testing in Theory and Practice
Conference Dates
November 23, 1995-November 24, 1994
Conference Location
Dusseldorf, 1, GE

Citation

Song, J. , Smith, J. and Vorburger, T. (1995), 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 April 15, 2024)
Created December 31, 1994, Updated October 12, 2021