Indentation Velocity Effect on Martens Hardness Measurement

The indentation velocity effect on Martens Hardness (HM) was investigated in the macro-, micro- and nano ranges of the indentation test. The indentation test in the micro- and nanorange was analyzed for practical indentation velocities ranging between 2 to 60 nm/s. The influence of the indentation velocity Vind for coated samples yielded the largest relative changes of Martens Hardness for ductile materials with small coating thickness and for brittle materials with large coating thickness. A sensitivity to final velocity of indentation was confirmed for high hardness level for the macro range