Aging treatment refers to the heat treatment process of metal or alloy workpieces after solution treatment, from high-temperature quenching or a certain degree of cold working deformation, at a higher temperature or room temperature to maintain their shape and size, and their properties change with time.
QPQ process can greatly improve the wear resistance and corrosion resistance of the metal surface, while the workpiece hardly deforms.
Nitriding treatment refers to a chemical heat treatment process in which nitrogen atoms penetrate the surface of the workpiece in a certain medium at a certain temperature. Nitriding can make the surface of parts have higher hardness and wear resistance.
The workpiece is placed in the active carburizing medium and heated to 900-950 ℃. After enough time, the decomposed active carbon atoms in carburizing medium penetrate into the surface of steel plate, so as to improve the wear resistance of workpiece.
The heat conduction speed of molten salt is much faster than other traditional methods, so the heating process of workpiece is faster, easier to control and more uniform.
This method has been widely used in gear manufacturing to obtain good wear resistance.
To reduce the brittleness of steel parts, the quenched steel parts are kept warm for a long time at a suitable temperature higher than room temperature but lower than 710 C° and then cooled.
It is often used to improve the cutting performance of materials and sometimes used as the final heat treatment for parts with low requirements.
The purpose of heating the workpiece to appropriate temperature, adopting different holding time according to material and workpiece size, and then cooling slowly is to make the internal structure of the metal reach or close to equilibrium state, to obtain good technological performance and service performance.
Quenching (quenching) is a heat treatment process in which steel is heated above the critical temperature for a certain period of time, and then cooled at a cooling rate greater than the critical cooling rate.