DIFFERENCES OF PERFORMANCE BETWEEN THE STEEL STANDARD BLOCKS FOR HARDNESS MADE IN JAPAN AND THAT IN GERMANY IN THE DISPLACEMENT RANGE FROM NANO TO MICROMETER

摘要

Even though the efforts have been made to develop an ideal hardness testing machine, it is inevitable that the difference of performance between the models (or types) of testing machine significantly affect the test results especially in the range of nanoindentation. The hardness reference blocks can be used to compensate the unreliability of machines by evaluating the difference between machines. The performance of hardness reference blocks should be considered from various aspects, e. g., repeatability and uniformity of parameters such as HM or H_(IT), easy handling, durability of testing, the dimensions and the price. Due to the large amount of usage in the world industry, the hardness reference blocks of Japanese manufacturer (HMV900, HMV500, UMV500, UMV700 of YSTL) and German manufacturer (HV840 and HV540 of Buderus) are chosen in this report and tested by using PICODENTER HM500 nanoindentation machine of Helmut Fischer, which can cover the displacement range of pico- to micrometers.