air hardening

air hardening

n
(Metallurgy) a process of hardening high-alloy steels by heating and cooling in a current of air. Compare oil hardening
References in periodicals archive ?
Various types of OSA have properties of a mineral binder, the hydration type of which varies from air hardening (coarse bottom and cyclone OSA types) to pozzolanic (CFB OSA) and latent hydraulic (PF OSA).
Evidently, after air hardening from 850 [degrees]C, heating up to 650 [degrees]C enabled disintegration of metastable b-phase, which caused additional hardening of the alloy.
PRO-DOH(TM) AIR HARDENING COMPOUND: The makers of Play-Doh(R) Brand Modeling Compound are pleased to introduce Pro-Doh, a cool creative compound that air-hardens to make fantastic, detailed mini-sculptures .
Cox demonstrated that hardness values of 700 Bh and above can be achieved in modified Type-1 irons without high-temperature heat treatment while regular Ni-Hards can be improved by either air hardening, cryogenic treatments and/or magnesium additions.