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Tempering. (in metallurgy), a type of heat treatment, in which a quenched alloy is reheated to a temperature below the first critical point, is held at that temperature, and is subsequently cooled. The term âtemperingâ is mainly applied to steels.
Galling is a physical or chemical adhesion of the work material to the tool surface, most prevalent with stainless steel and aluminum. Some of the other variables are tooling hardness, types and amounts of carbide in the tooling, the surface finish of the tooling, and lubrication.urface friction can be controlled by the tooling material's carbide size, type, and distribution. Figure 2 shows the micrographs for AISI D2, 6 percent vanadium P/M, and antigalling P/M tool steels, allowing a comparison of their carbides.