mid-15c., from drip (v.). The slang meaning stupid, feeble, or dull person is first recorded 1932, perhaps from earlier American English slang sense nonsense (1919).
Time at heat and temperature are critical in the hardening transformation phase. Rapid cooling and tempering complete the process. Quench and Temper provides strength and uniformity of hardness through the entire part from the surface to the core. This is achieved by heating the entire part up above the transformation temperature for a set period of time. Upon quenching, parts must be tempered to the desired hardness creating a Tempered Martensitic Microstructure. Medium Carbon Steels (.25-.70C) are commonly Quench and Tempered. During this quenching process, parts are cooled rapidly thereby locking in the microstructure transformation. Oil is a very common quench medium for this process.
(click on thumbnail to enlarge). Metal Hardening / Metal Quenching / Metal Tempering. Three large bearing sets being removed from Metlab 180 diameter by 156 high carburizing furnace from the hardening temperature (1550Â°F) for subsequent quenching into agitated, hot oil.etal Tempering. Tempering is done to develop the required combination of hardness, strength and toughness or to relieve the brittleness of fully hardened steels. Steels are never used in the as quenched condition. The combination of quenching and tempering is important to make tough parts.