On 2018-08-08 14:48:54
Material quenching heat treatment
Material quenching heat treatment, metallurgical quenching heat treatment
Cognition of "quenching" heat treatment in material science and metallurgy
In material science, the so-called quenching is the rapid cooling of the workpiece in water, oil or air to obtain certain material properties. It is a heat treatment processing method. Quenching is to prevent the undesirable low-temperature process and the occurrence of this kind of aspheric transformation. It achieves this by reducing the window of time during which these unwanted reactions are thermodynamically advantageous and dynamically accessible; for example, quenching can reduce the grain size and increase the hardness of metal and plastic materials.
In metallurgy, quenching is a commonly used quenching steel, in which martensite is used. In this case, the steel must be rapidly cooled through its eutectic point, and its temperature becomes unstable. The eutectoid temperature will be much lower in the steel containing nickel, manganese and other metals, but the dynamic barrier of transformation will remain unchanged, which makes the quenching can start at a lower temperature and makes the process easier.
The addition of tungsten to the high-speed steel helps to increase the power barrier and creates an illusion that the material cools much faster than it actually does. Even if the alloy is cooled slowly in air, it has most quenching effects. Extremely fast cooling prevents all crystal structures from forming, producing amorphous metals or "metallic glasses.".