くぼみ深さ測定方式の超微小硬度計による表面の評価(第1報)

圧子先端半径の影響および直接くぼみ測定方式との相違

抄録

Hardness both under test load and after unloading in three materials (pure gold, pure platinum and SK 5 steel), are obtained using an ultra-microhardness tester that directly measures the depth of concavity, using indenters (Vickers type and triangular pyramid). The influence of the radius of the indenter tip and differences in the classical method of measuring the concavity rim optically, also are investigated. The results obtained are as follows: (1) In hardness measurements both under test load and after unloading, correction of the radius of the indenter tip by comparison with the ideal shape, can remove the errors due to tip radius difference. (2) Correction of errors at the indenter tip and correction of errors due to "shallowing", coincide hardness measurements obtained from unloaded depth with hardness measurements obtained from the classical method. The correction proposed here for SK 5 steel, is effective for all indenter shapes and all test loads in this report.