Abstract
Quenched carbon steel (0.63%C) test pieces were finished by such various methods as grinding, lapping, superfinishing, supergrinding, emery-paper polishing and electropolishing. The depth of the surface layers of the test pieces thus finished was measured by etching method explained in detail in the first report.
It was confirmed that these surface layers were considerably deeper than we expected, due to the existence of residual surface layers produced by previous finishing (grinding).
The depth of surface layer produced only by the final finishing process can be measured by removing those produced in the previous finishing process.
The results are as follows:
Medium and fine grinding: 7μ and 2.5μ, lapping: 2μ, superfinishing: 1μ.
