Heat treating
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Heat treating is a group of industrial, thermal and metalworking processes used to alter the physical, and sometimes chemical properties of a material. The most common application is metallurgical. He
Heat treating furnace at 1,800 °F (980 °C)
Photomicrographs of steel. Top: In annealed (slowly cooled) steel, the carbon precipitates forming layers of ferrite (iron) and cementite (carbide). Bottom: In quenched (quickly cooled) steel, the carbon remains trapped in the iron, creating great internal stresses in the needle or plate-like grains.
Hypereutectoid steel
Steel castings after undergoing 12-hour 1,200 °C (2,190 °F) heat treatment.
Quenching
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In materials science, quenching is the rapid cooling of a workpiece in water, gas, oil, polymer, air, or other fluids to obtain certain material properties. A type of heat treating, quenching prevents
Heat treating
…hardening of a material. Heat treatment techniques include annealing, case hardening, precipitation strengthening, tempering, carburizing, normalizing and quenching. Although the term heat treatment applies only to processes where the heating and cooling are done for the specific purpose of altering properties…
Coke being pushed into a quenching car, Hanna furnaces of the Great Lakes Steel Corporation, Detroit, Michigan, November 1942
Fotothek df n 08 0000320