Strengthening by forming fine particles of a second phase during a low-temperature ageing treatment.
The alloy is solution-treated and quenched soft, machined in that condition, then aged at a moderate temperature where fine precipitates form and raise the strength. Because the ageing temperature is low, distortion is minimal — which is the whole point.
17-4 PH and 15-5 PH are the common stainless grades; Inconel 718, Waspaloy and 13-8 Mo are high-temperature and high-strength examples. All of them machine in the soft condition.
Machining a precipitation-hardening alloy in the aged condition. It is dramatically harder and the part should have been finished before ageing.
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