SPALLING. A chipping or flaking of a surface due to any kind of improper heat treatment or material dissociation.
Glossary Terms
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SPHEROIDIZING. Heating and cooling to produce a spheroidal or globular form of carbide in steel. Spheroidizing methods frequently used are: 1. Prolonged holding at a temperature just below Ae1. 2. Heating and cooling alternately between temperatures that are just above and just below Ae1. 3. Heating to a temperature above Ae1 […]
SPRAY QUENCHING. A quenching process using spray nozzles to spray water or other liquids on a part. The quench rate is controlled by the velocity and volume of liquid per unit area per unit of time of impingement.
SPRING TEMPER. A temper of nonferrous alloys and some ferrous alloys characterized by tensile strength and hardness about two-thirds of the way from full hard to extra spring temper.
STABILIZING TREATMENT. (1) Before finishing to final dimensions, repeatedly heating a ferrous or nonferrous part to or slightly above its normal operating temperature and then cooling to room temperature to ensure dimensional stability service. (2) Transforming retained austenite in quenched hardenable steels, usually cold treatment. (3) Heating a solution-treated stabilized grade […]
STATISTICAL PROCESS CONTROL. The application of statistical techniques for measuring and analyzing the variation in processes.
STATISTICAL QUALITY CONTROL. The application of statistical techniques for measuring and improving the quality of processes and products (includes statistical process control, diagnostic tools, sampling plans, and other statistical techniques).