An "easy" blueing process?

Dan Squire djws@hti.net
Thu, 23 Nov 1995 15:26:24 -0600


>In reference to bluing metal by heat:
>
>I would use it [Bluing by heating] for cosmetic effect on a part under
stress >(like pressure bar screws)only with due regard for its potential
effect on the >strength of the parts.

For a eutectoid plain-carbon steel the microstructure of the material will
vary according to the cooling rate.  A water quench will produce a
microstructure of martensite and an oil quench will produce a microstructure
of martensite and pearlite.  If  the material is allowed to cool in still
air ( to minimize heat transfer by forced convection ) the microstructure
will consist of proeutectiod ferrite and fine pearlite.

Dan Squire
-Claiming Lumped Thermal Capacity-




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