cent chromium, 10 per cent nickel and 0.25 per cent phosphorus. Ageing of
such an alloy at about 680°C results in a carbide precipitate being produced and
this,
together with the lattice strain produced by the phosphorus, results in a
degree of hardening.
12.7 Surface hardening
There are many situations where wear or severe stress conditions may indicate
the need for a hard surface to a component without the entire component being
made hard and possibly brittle. The various methods used for surface
hardening can, in the main, be grouped into two categories:
1 Selective heating of the surface layers.
2 Changing th ...
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