2011•The Heat TreatmentRequires access

Heat Treatment Process and Resulting Microstructure and Hardness for Hot-rolled P80 Die Steel

HE Wen-wen

Abstract

P80 steel is a precipitation-hardening die steel for plastics.Effect of normalizing and tempering on microstructure and hardness of P80 steel was investigated.The results show that microstructure of P80 steel normalized at 850°C and tempered at 500℃is composed of tempered lath martensite and bainite,with a lot of granular second phases precipitated in the lath martensite,producing precipitation hardening.After being heat treated by above mentioned procedure,the section hardness of the 80 mm-thick specimen is as high as 39 to 43 HRC,conforming with the specification requirements.

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Key concepts: Lath, Tempering, Bainite, Martensite, Microstructure, Materials science, Metallurgy, Heat treating