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GEOMETRIC MEASUREMENT COMPARISONS FOR ROCKWELL DIAMOND INDENTERS

Published

Author(s)

Jun-Feng Song, Samuel R. Low III, Xiaoyu A. Zheng

Abstract

In the uncertainty budget of Rockwell C hardness (HRC) tests, geometric error of the Rockwell diamond indenter is a major contributor. The geometric calibration of Rockwell diamond indenters has been a key issue for Rockwell hardness standardization. The National Institute of Standards and Technology (NIST) developed a microform calibration system based on a stylus instrument for the geometric calibration of Rockwell diamond indenters. Using that system, a NIST master standard Rockwell diamond indenter No. 3581 was established in 1995, by which approximately 300 standard reference material (SRM) 2810-2812 Rockwell C hardness (HRC) blocks were calibrated for implementation of the HRC scale in the United States. This indenter has been re-calibrated in 1997, 2005 and 2007. The calibration results have shown both high stability for the NIST standard Rockwell diamond indenter and high reproducibility for the NIST microform calibration system. After more than fifteen years of service, the stylus instrument was recently replaced by a new one. In order to test the measurement agreement between the two stylus instruments, another NIST master Rockwell diamond indenter No. 101 has been recently calibrated by the new instrument and the calibration result shows good agreement with the previous results.
Proceedings Title
Proceedings of XIX IMEKO World Congress
Conference Dates
September 6-11, 2009
Conference Location
Lisbon,, -1
Conference Title
XIX IMEKO World Congress

Keywords

Rockwell C hardness, HRC, diamond indenter, microform calibration Rockwell C hardness, HRC, diamond indenter, microform calibration

Citation

Song, J. , Low, S. and Zheng, X. (2009), GEOMETRIC MEASUREMENT COMPARISONS FOR ROCKWELL DIAMOND INDENTERS, Proceedings of XIX IMEKO World Congress, Lisbon,, -1, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=902704 (Accessed July 31, 2021)
Created September 6, 2009, Updated February 19, 2017