SLACK QUENCHING. The incomplete hardening of steel due to quenching from the austenitizing temperature at a rate slower than the critical cooling rate for the particular steel, resulting in the formation of one or more transformation products in addition to martensite.
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THERMAL STRESS. Stresses in metal resulting from non-uniform temperature distribution.
STATISTICAL PROCESS CONTROL. The application of statistical techniques for measuring and analyzing the variation in processes.
AGE HARDENING. Hardening by aging, usually after rapid cooling or cold working.