Indenter wear
Indenter wear is the mechanical abrasion of the indenter tip during the hardness testing process. Progressive wear leads to inaccurate measurements.
Physical-Chemical Mechanism
Indenter wear occurs when the indenter (e.g., a ball or cone) penetrates the material being tested and exerts mechanical forces. These forces cause microscopic abrasion processes on the indenter tip.
Metallurgical Relevance & Risks in Welding
Progressive wear can prevent accurate hardness measurement, as it affects the penetration depth and the stress state measurement. This leads to systematic measurement errors and can result in misdiagnosis.
Workshop Practice & Instructions
To minimize wear, the indenter should be regularly inspected or replaced. The hardness test should be performed in a clean, protected environment to avoid mechanical influences. The recommended penetration depth is typically 0.5 to 1 mm.