hardness values
hardness values
(OP)
Can anyone advise me on the ideal and expected surface and core hardnesses for bearing quality balls of 64mm diameter made from 100Cr6 and 100CrMn6 ?
Am I right in believing that the 100CrMn6 would give a more uniform hardness and therefore less internal residual stress ?
Am I right in believing that the 100CrMn6 would give a more uniform hardness and therefore less internal residual stress ?





RE: hardness values
For a 64-mm ball therefore I would expect to see approximately the same hardness profile for both alloys which would be essentially flat at around 62 - 63 Rc.
RE: hardness values
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The microhardness data in the Struers paper converts to ~ 62-63 HRC.
RE: hardness values
Carburise, what do you mean by 'ideal diameter'. Previously someone said the the maximum thickness for full through-hardening in 100Cr6 was 32mm. This seems along way from the dimensions you give of 85 and 230mm so these things may not be connected. Perhaps you can explain to me a little more please ?
RE: hardness values
RE: hardness values
I guess the remaining material is mainly austenite and the difference in structure gives rise to potential residual stresses ?
RE: hardness values
The non martensitic product will most likely be bainite rather than austenite.