During austempering, steel is transformed to ______

In manufacturing, hardening is a process that involves heating steel or iron to a critical temperature, holding it there, and then cooling it quickly. The material becomes harder as it cools.  Hardening is an important process in manufacturing brake discs. It can also improve the service life of mechanical components that are repeatedly loaded and unloaded, such as axles and cogs.  The hardening process: Temperature: The critical temperature depends on the type of steel and can range from 760–1300°C. Holding time: The material is held at the critical temperature for one hour per inch of... Show more

In manufacturing, hardening is a process that involves heating steel or iron to a critical temperature, holding it there, and then cooling it quickly. The material becomes harder as it cools. 
Hardening is an important process in manufacturing brake discs. It can also improve the service life of mechanical components that are repeatedly loaded and unloaded, such as axles and cogs. 

The hardening process:
Temperature: The critical temperature depends on the type of steel and can range from 760–1300°C.
Holding time: The material is held at the critical temperature for one hour per inch of thickness.
Cooling rate: The cooling rate depends on the material and can range from very fast (water quench) to very slow (air cool).
Quenching: The material is quenched in oil or water.
Atmosphere: The atmosphere around the material must be neutral to the material's carbon content.
Uniform temperature: The entire part must reach a uniform temperature before cooling. 

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