surface finish effect on hardness testing
surface finish effect on hardness testing
(OP)
is there any?
thanks.
thanks.
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surface finish effect on hardness testing
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surface finish effect on hardness testingsurface finish effect on hardness testing(OP)
is there any?
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RE: surface finish effect on hardness testing
rp
RE: surface finish effect on hardness testing
Also, what is the specific method of hardness testing? Some micro hardness tests use very small probes/loads and evaluating the results optically requires a very smooth surface at the test location.
RE: surface finish effect on hardness testing
for 30T, what Ra needed?
thanks.
RE: surface finish effect on hardness testing
RE: surface finish effect on hardness testing
Specimen Surface Preparation. The degree of workpiece surface roughness that can be tolerated depends on the Rockwell scale being used. As a rule, for a load of 150 kgf on a diamond indenter, or 100 kgf on a ball indenter, a finish ground surface is sufficient to provide accurate readings. As loads become lighter, surface requirements become more rigorous. For a 15 kgf load, a polished or lapped surface usually is required.
Surfaces that are visibly ridged due to rough grinding or coarse machining offer unequal support to the indenter. Loose or flaking scale on the specimen at the point of indenter contact may chip and cause a false test. Scale should be removed by grinding or filing. Decarburized surface metal must also be removed to permit the indenter to test the true metal beneath.
Ref. ASM Handbook Volume 8
RE: surface finish effect on hardness testing
RE: surface finish effect on hardness testing