1. Normalizing:
A heat treatment process in which steel or steel parts are heated to an appropriate temperature above the critical point AC3 or ACM, maintained for a certain period of time, and then cooled in the air to obtain a pearlite-like structure.
2. Annealing:
A heat treatment process in which hypoeutectoid steel workpieces are heated to 20-40 degrees above AC3, kept warm for a period of time, and then slowly cooled in the furnace (or buried in sand or cooled in lime) to below 500 degrees in the air.
3. Solid solution heat treatment:
A heat treatment process in which the alloy is heated to a high temperature and maintained at a constant temperature in the single-phase region to fully dissolve the excess phase into the solid solution, and then rapidly cooled to obtain a supersaturated solid solution.
4. Aging:
After the alloy has undergone solid solution heat treatment or cold plastic deformation, its properties change with time when it is placed at room temperature or slightly above room temperature.
5. Solid solution treatment:
fully dissolve various phases in the alloy, strengthen the solid solution and improve toughness and corrosion resistance, eliminate stress and softening, so as to continue processing and forming
6. Aging treatment:
Heating and holding at a temperature where the strengthening phase precipitates, so that the strengthening phase precipitates and hardens, improving strength.
7. Quenching:
A heat treatment process in which the steel is austenitized and then cooled at an appropriate cooling rate so that the workpiece undergoes unstable structural transformation such as martensite in all or within a certain range of the cross section.
8. Tempering:
A heat treatment process in which the quenched workpiece is heated to an appropriate temperature below the critical point AC1 for a certain period of time, and then cooled using a method that meets the requirements to obtain the required structure and properties.
9. Carbonitriding of steel:
Carbonitriding is the process of simultaneously infiltrating carbon and nitrogen into the surface layer of steel. Traditionally, carbonitriding is also called cyanidation. Currently, medium-temperature gas carbonitriding and low-temperature gas carbonitriding (i.e., gas soft nitriding) are widely used. The main purpose of medium temperature gas carbonitriding is to improve the hardness, wear resistance and fatigue strength of steel. Low-temperature gas carbonitriding is mainly nitriding, and its main purpose is to improve the wear resistance and seizure resistance of steel.
10. Quenching and tempering:
It is generally customary to combine quenching and high-temperature tempering as a heat treatment called quenching and tempering. Quenching and tempering treatment is widely used in various important structural parts, especially those connecting rods, bolts, gears and shafts that work under alternating loads. After quenching and tempering treatment, the tempered sorbite structure is obtained, and its mechanical properties are better than those of the normalized sorbite structure with the same hardness. Its hardness depends on the high temperature tempering temperature and is related to the tempering stability of the steel and the cross-sectional size of the workpiece, generally between HB200-350.
11. Brazing:
A heat treatment process that uses brazing material to bond two workpieces together.
Post time: Apr-11-2024