THE INFLUENCE OF MICROSTRUCTURE HOMOGENEITY ON THE UNIFORMITY OF HARDNESS STANDARD BLOCKS
Abstract
The aim of this work is to correlate the homogeneity of the microstructure of two certified hardness standard blocks, both with the same hardness value range, with its uniformity hardness values. In order to identify the morphological characteristics of the blocks studied, as grain size distribution, an automatic image analysis system with software based on ASTM E112 and ASTM E1382 standards was employed. The hardness measurements were carried out in industrial hardness tester machine, in three different regions of the blocks. The results obtained for both blocks showed that, for the regions where coarsed grains were observed as islands of microstructure non-homogeneity, the hardness values dropped compared with those mentioned in the calibration certificates. The microstructure homogeneity plays therefore an important role on the uniformity of hardness values for reference blocks.
Event details
- Event
- Joint International Conference on Force, Mass, Torque, Hardness and Civil Engineering Metrology in the age of globalization
- Technical Committee
- TC5
- Place
- Celle, GERMANY
- Time
- 24 September 2002 - 26 September 2002