8. Metallographic aspects of the resulting layers
8.1 Case-hardening
Leaving aside the case of bainitic case hardening, the aim of case hardening followed by quench hardening is to obtain a carbon-rich martensite surface on a core with a bainitic or low-carbon martensitic structure.
In practice, a number of other constituents may be present in hardened and tempered layers :
residual austenite, a low-hardness constituent (≈ 150 HV), figure...
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Metallographic aspects of the resulting layers
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