硬さに及ぼす表面油膜の影響(自然科学)
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概要
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In general, surface should be cleaned when measuring surface hardness. The relationship between hardness and surface uncleanness, however, has scarcely been researched. In the present study, the influence of uncleanness on the hardness of carbon steel is investigated; the Vickers hardness of a cleaned surface is compared with that of a surface lubricated with liquid paraffin and/or liquid paraffin containing 3 % oleic acid, and then discussed. An unclean surface was found to have a detectable influence on hardness, for example, the hardness of semi-hardened steel, JIS-S45C of 205 Hv for a clean surface decreased to 187 Hv when lubricated with liquid paraffin.
- 2005-10-31