Several common heat treatment concept

1. Normalizing: the heating of steel or steel to the critical point AC3 ACM or more appropriate time to maintain a certain temperature in the air cooled to obtain a heat treatment process pearlite class organization.

2.
Annealing annealing: The hypoeutectoid steel workpiece is heated to 20-40 degrees above AC3, after holding for some time, with the furnace slow cooling (or buried in the sand or lime cooling) or less to 500 degrees in the air-cooled heat treatment process

3. Solution heat treatment: The alloy is heated to a high temperature single-phase region to maintain a constant temperature, so that the excess phase fully dissolved into the solid solution, and then rapidly cooled to obtain a supersaturated solid solution heat treatment process through the

4. Aging: Alloy after solution heat treatment or cold plastic deformation, place or slightly above room temperature is maintained at room temperature, their performance varies with time phenomenon.

5. Solution treatment: the alloy in various phases fully dissolve the solid solution strengthening and improving the toughness and corrosion resistance, eliminate stress and soften to continue processing molding

6. Aging: The strengthening phase precipitation temperature of the heating and insulation, so precipitation strengthening phase, to be hardening, improve strength

7. Quenching: the steel after austenitizing at an appropriate cooling rate of the workpiece occurs in the cross section of the whole or a certain range of an unstable structure such as martensite transformation heat treatment process

8. Tempering: The hardened workpiece is heated to the critical point below the proper temperature AC1 maintain a certain time, to meet the requirements of the method followed by cooling to obtain the desired microstructure and properties of the heat treatment process

9.
Carbonitriding steel Infiltration: carbonitriding is to penetrate the surface of the steel, while the process of carbon and nitrogen. Traditionally carbonitriding, also known as cyanide, currently the gas temperature and low-temperature gas carbonitriding carbonitriding (ie gas soft nitriding) is widely used. The main purpose of the temperature gas carbonitriding is to increase steel hardness, wear resistance and fatigue strength. Low-temperature gas carbonitriding with nitriding based, its main purpose is to improve the wear resistance of steel and seizure resistance.

10. Quenching and quenching
tempering: generally accustomed to quenching and tempering heat treatment combining called quenching. It quenching widely used in a variety of important structural parts, especially those in the alternating load rod work, bolts, gears and shafts, etc. After quenching and tempering treatment to obtain sorbite organization, its mechanical properties than the same hardness normalizing sorbite structure is superior. It depends on the tempering temperature and hardness and tempered steel stability and cross-sectional dimensions of the workpiece, generally between HB200-350.

11. Brazing: The two workpieces with solder bonded together heat treatment work