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Several common heat treatment concepts
Positive fire: heat treatment process of heating steel or steel parts to the appropriate temperature above the critical point AC3 or ACM for a certain period of time and then cooling in the air to obtain pearlite tissue.
1. normalizing: heating steel or steel parts to the critical point AC3 or ACM above the appropriate temperature for a certain period of time and then cooling in the air to obtain the heat treatment process of pearlite tissue.
2. Annealing annealing: heating the sub-co-analysis steel workpiece to 20-40 degrees above AC3, holding for a period of time, slowly cooling with the furnace (or buried in sand or lime cooling) to 500 degrees below the air cooling heat treatment process.
3. Solid solution heat treatment: the alloy is heated to a high temperature single-phase zone to maintain a constant temperature, so that the excess phase is fully dissolved into the solid solution, and then rapidly cooled to obtain a supersaturated solid solution heat treatment process.
4. Aging: alloy after solid solution heat treatment or cold plastic deformation, placed at room temperature or slightly higher than room temperature, its performance changes with time.
5. solid solution treatment: the alloy in the full dissolution of various phases, strengthen the solid solution and improve toughness and corrosion resistance, eliminate stress and softening, in order to continue processing molding.
6. Aging treatment: heating and heat preservation at the temperature of strengthening phase precipitation, so as to harden and improve strength.
7. Quenching: A heat treatment process in which the steel is austenized and cooled at an appropriate cooling rate, so that the workpiece occurs in all or a certain range of unstable organizational structure transformation such as martensite in the cross section.
8. Tempering: The quenched workpiece is heated to the appropriate temperature below the critical point AC1 for a certain period of time, and then cooled by a method that meets the requirements to obtain the required structure and performance of the heat treatment process.
9. Carbon-nitrogen co-penetration of steel: Carbon-nitrogen co-penetration is the process of penetrating carbon and nitrogen into the surface of steel at the same time. Habitually carbon-nitrogen co-osmosis, also known as cyanidation, is currently widely used in medium-temperature gas carbon-nitrogen co-osmosis and low-temperature gas carbon-nitrogen co-osmosis (I. e. gas soft nitride). The main purpose of medium temperature gas carbonitriding is to improve the hardness, wear resistance and fatigue strength of steel. Low-temperature gas carbon-nitrogen co-penetration is mainly nitriding, the main purpose of which is to improve the wear resistance and anti-bite of steel.
10. Quenching and tempering quenching and tempering: It is generally customary to combine quenching and tempering with heat treatment. 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. Tempered sorbite tissue is obtained after quenching and tempering treatment, and its mechanical properties are better than the normalized sorbite tissue of 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 and steel.
11. Brazing: A heat treatment process in which two workpieces are bonded together with solder.
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