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
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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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).
Composition and properties of oil shale ash concrete
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.
Investigation of structure and mechanical properties: of Ti-7.2Al-2.9Mo--2.7W-3Nb-2.3Zr-0.4Si alloy
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.
93rd AFS Casting Congress in review

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