Quenching furnace quenching temperature
Quenching temperature according to the steel components, tissue and to determine the different performance requirements. Sub-eutectoid steel is AC3 (30 ~ 50 ℃); eutectoid steel and eutectoid steel is AC1 (30 ~ 50 ℃).
Sub-eutectoid steel quenching temperature is lower than use AC3 if the temperature is not yet fully austenitic steel at this time, there is not some change in ferrite, ferrite after quenching remains in the hardened tissue. Ferrite hardness is low, so that mainly the hardness after quenching, but also affect other mechanical properties. If sub-eutectoid steel is heated to well above the AC3 temperature quenching, the austenite grain back significantly thick, and destruction of properties after quenching. Therefore, sub-eutectoid steel quenching temperature selected AC3 (30 ~ 50 ℃), then it will ensure full austenitization, while maintaining a small austenite grain size.
Eutectoid steel quenching temperature is generally recommended as AC1 (30 ~ 50 ℃). In the actual production increase also appropriate under the circumstances around 20 ℃. Heating in this temperature range, the organization of small grains of austenite and some small uniform distribution of undissolved carbides. Except for a handful after quenching of residual austenite, its organization for the sheet martensite matrix uniformly distributed on the small carbide particles. Such an organization, high hardness, wear resistance number, and brittle is relatively small.
Eutectoid steel quenching temperature not lower than AC1, because at this time has not yet austenitic steel. If heated to a temperature slightly higher than AC1, complete transformation of pearlite bearing austenitic, and then dissolved in a small amount of cementite austenite. At this point the austenite grain size, and its higher carbon mass fraction has been analyzed and common ingredients. If the temperature continues to rise, continued integration into the secondary cementite austenite, resulting in the austenite grain continue to grow, the rising concentration of carbon will lead to deformation hardening tendency increases, quenching microcracks increased and the brittleness increases. And because the austenite carbon content is too high, the increase in the number of residual austenite after quenching to reduce the hardness and wear resistance of the workpiece. So eutectoid steel quenching temperature much higher than the AC1 is not appropriate, heated to complete austenitizing temperature above the ACm or even inappropriate.
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