Abstract
The most suitable heat treatment process for T8 steel was studied by testing T8 steel under different heat treatment processes. The metallographic structure of T8 steel after heat treatment was observed by metallographic microscope. The hardness of T8 steel under different heat treatment processes was studied by Rockwell hardness tester as a reference for mechanical properties. The results show that the quenching of T8 steel at 860°C is the optimum quenching temperature of T8 steel, and the temperature should not be too high or too low. If the temperature is too high, the original austenite grains in the steel will become coarse, which will further affect the quenching. The martensite needle makes it coarse; the optimum tempering temperature after quenching of T8 steel is 200°C, and the hardness of the tempered T8 steel sample reaches the maximum at this temperature. When the tempering temperature is increased from 100°C to 400°C, the tempered structure of the sample is sequentially transformed into tempered martensite, tempered torsite and tempered sorbite.
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