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Research of Pre - hardening Heat Treatment Process for P20 Plastic Mould Steel
Pages: 35-38
Year: Issue:  4
Journal: Wide and Heavy Plate

Keyword:  Plastic mould steelHeat treatmentMicrostructure;
Abstract: The paper describes the microstructure observation and hardness determination by using optical micro-scope,scanning electron microscope and Vickers hardness tester,studies the changing law of microstructure and hard-ness obtained under the conditions of different pre - hardening heat treatment process parameters such as quenching temperature,quenching medium,tempering temperature. The results show that lath martensite and bainite in the micro-structure of water quenched and air quenched steel gradually decrease with the increase of tempering temperature,fer-rite gradually increases and grows up,the carbide increases and hardness gradually decreases;the flake type M/ A con-stituent between laths,higher displacement density and fine carbide in ferrite attains a relatively higher hardness as the water quenched steel tempered in 620 ℃,and the process parameters ensuring an optimum prehardening result of the steel grade is determined.
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