To meet certain properties of investment castings, the products will be heat treated. In our casting factory, usually used heat treatment processes are hardening, tempering, annealing, normalizing, etc.
As one kind of such heat treating process, Age Hardening is also widely used. The carbon and nitrogen factors melt in iron during high temperature will out from the pure Fe. These carbon and nitrogen factors will become to carbide and nitride due to chemical reaction. Such reactions will prevent the plastic deformation of the investment castings. Thus, to increase the strength of the alloy steel investment castings and carbon steel investment casting, but plastic deformation and toughness is low. Such process is age hardening, also called Aging.
Age hardening takes a long time. But heating after plastic deformation of the steel castings will speed up the age hardening process.
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