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Optical microscope,stereomicroscope,scanning electronic microscope (SEM) and mechanical property testing were used to research the effects of different quenching temperatures on the microstructure and mechanical properties of the H13 mandrel steel.The results indicate that following an increase in the quenching,the degree of alloying is enhanced due to the carbides dissolving gradually in austenite,which improves the hardenability of the specimens,as well as their room and high-temperature strength.At the same time,the fracture toughness increases due to the increment of the martensite number and the interparticle distance of the carbides.However,extremely coarse grain and martensite can decrease the impact toughness.Optimal performance can be obtained after quenching at 1060℃ and double tempering at 620℃.Consequently,the service life of the H13 mandrel steel is extended significantly.
Optical microscope, stereomicroscope, scanning electronic microscope (SEM) and mechanical property testing were used to research the effects of different quenching temperatures on the microstructure and mechanical properties of the H13 mandrel steel. The results indicate that following an increase in the quenching, the degree of alloying is enhanced due to the carbides dissolving gradually in austenite, which improves the hardenability of the specimens, as well as their room and high-temperature strength. At the same time, the fracture toughness increases due to the increment of the martensite number and the interparticle distance of the carbides. Even extremely coarse grain and martensite can decrease the impact toughness. Optimal performance can be obtained after quenching at 1060 ° C and double tempering at 620 ° C. Conclusion, the service life of the H13 mandrel steel is extended .