Keywords: Quench, intensive quenching, Intense quenching, cracking, distortion, high-speed stirring, high-pressure spraying, CaCl2 aqueous solution, liquid nitrogen, rapid cooling,

Intense quenching technology

　　Intense quenching technology was first discovered and proposed by Dr. KOBa3KO  in 1964. In 1992, academician h. n. KO6ckO of the institute of engineering thermophysics of the Ukrainian academy of sciences developed a 1 intensive quenching technology for steel and steel parts that can avoid cracking and reduce distortion. Strong crack quenching technology is the use of high-speed stirring or high-pressure spray or CaCl₂ aqueous solution or liquid nitrogen for rapid cooling, when the surface layer of the workpiece to form the maximum compressive stress, the strong quenching process to stop, followed by isothermal cooling.

The advantages of intensive quenching technology are as follows.

1. Compared with oil-quenched parts, the service life is increased by 3~4 times.
2. Medium and high alloy steels can be replaced with low-cost carbon steels or low alloy steels.
3. Oil can be replaced with water or a water-soluble medium.
4. The process is stable and easy to realize automatic production.

At present, strong quenching technology has been applied to automobile half shafts, sprockets, bearing rings, fasteners, pin shafts and molds.

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