What are the factors that affect the hardness value of the Vickers hardness tester? This should be analyzed from the test principle and test conditions, specifically the following aspects:
1. Hardness tester:
(1) Load mechanism: mainly includes the change of weight weight; the movement condition of the load mechanism; the friction force of the main shaft; the perpendicularity between the main shaft and the worktable; the change of the load lever arm ratio.
(2) Indenter: It mainly includes two aspects: the geometric size of the indenter and the surface quality of the indenter.
(3) Measuring device: mainly includes the clarity of the microscope field of view; the quality of the reticle reticle; the quality of the micrometer mechanism, the uniformity of the scale; the magnification of the microscope is wrong.
2. Sample aspect: including the characteristics and unevenness of the material itself; the surface finish, thickness and planarity of the sample; the contact state between the sample and the workbench.
3. Operator: Including whether the load selection is appropriate; the speed of load application; the control of compliance with the holding time; the measurement error of the indentation diagonal.
4. Test environment: including too high or too low room temperature (suitable temperature is around 20 degrees), indoor dry humidity; vibration and shock of the test environment also affect the test results.
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