WORKING ZONE. That portion of the enclosed volume of a piece of thermal processing equipment occupied by parts or raw material during the soaking portion of a thermal treatment. It is usually, but not always, a high percentage of the total enclosed volume. It may include more than one control zone.
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THERMAL STRESS. Stresses in metal resulting from non-uniform temperature distribution.
ACID EMBRITTLEMENT. A form of hydrogen embrittlement that may be induced in some metals by acid treatment.
SELECTIVE QUENCHING. Quenching only certain portions of an object.
TEMPER COLOR. A thin, tightly adhering oxide skin that forms when steel is tempered at a low temperature, or for a short time, […]