age hardening

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Related to age-hardened: Surface hardening

age hardening

n
(Metallurgy) the hardening of metals by spontaneous structural changes over a period of time. See also precipitation hardening
References in periodicals archive ?
Its shape and age-hardened Pachmayr pad, I figured, dated it to the '60s.
* The nuts are made from age-hardened A286 stainless steel and recommended for use in stainless sheets with hardness of HRB 90/HB 192 or less.
Apparently, it was a fractured age-hardened breath mint.