Isothermal annealing is a new annealing method used to replace complete annealing and incomplete annealing. The microstructure and properties obtained after treatment are very similar to each other, but the time required for treatment can often be greatly shortened. Operation process Broadcast Edit The operation process of isothermal annealing can be roughly divided into the following steps: (1) Heat the steel to above the critical temperature (hypoeutectoid steel is above, eutectoid steel and hypoeutectoid copper are above), and keep it warm for a certain period of time to obtain an austenitic structure. (2) Put the heated steel into another furnace with a temperature slightly lower than the point, or cool the steel quickly with the furnace to a temperature slightly lower than the point, and keep it isothermal to make the supercooled austenite completely transformed into the product of transformation.
The principle is to use a lower isothermal temperature as much as possible under the condition of ensuring qualified hardness, so as to shorten the isothermal time and improve labor productivity. When the transformation is completed, take it out of the furnace and air cool it to room temperature.
The transformation is easy to control during isothermal annealing, which is more suitable for alloy steel with high stability of supercooled austenite. It can save the time of steel parts in the furnace and improve the turnover rate of the annealing furnace.
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