What is hardening and tempering? Why should do hardening and tempering?
Steel heat treatment process includes annealing, normalizing, quenching, tempering and surface heat treatment methods. Tempering also includes quenching and tempering and aging treatment. Tempering of steel: The quenched steel is reheated to a temperature (350 ° C to 650 ° C) to the desired mechanical properties and the carbon is precipitated as finely distributed cementite. As the tempering temperature increases, the carbide particles increase, the yield point and tensile strength decrease, reduce the hardness and brittleness, the elongation and shrinkage increase. Its purpose is to eliminate the internal stress generated by quenching in order to achieve the desired mechanical properties.
Tempering incluedes high-temperature tempering, middle temperature tempering and low temperature tempering three categories.
High temperature tempering: 500 ℃ ~ 650 ℃
Middle temperature tempering: 300 ℃ ~ 450 ℃
Low temperature tempering: 150 ℃ ~ 250 ℃
Forever hardening and tempering furnace is more suitable quenching and high temperature tempering. And so far, we have many successful references that shows the process of hardening and tempering can get good heat treatment effect.
Hardening and tempering heat treatment:
Tempering after hardening heat treatment method called hardneing and tempering heat treatment. High temperature tempering refers to the tempering between 500-650 ℃. Hardening can make steel performance, material has been greatly adjusted, its strength, ductility and toughness are good, with good overall mechanical properties. Sorbite will obtain after hardening and tempering. Tempered sorbite is formed when the martensite is tempered and tempered at 500 to 600 times magnification under an optical microscopy to distinguish it from carbides distributed within the ferrite matrix Carbon) pellet composite organization. It is also a martensite tempering organization, is a mixture of ferrite and granular carbide. Ferrite at this time has basically no carbon supersaturation, carbides are also stable carbides. Under normal temperature,it is a kind of balance organization.
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Post time: 12-21-2017