2013•Materials for Mechanical EngineeringRequires access
Effect of Heat Treatment on Microstructure and Properties of S390 Powder Metallurgy High Speed Steel
LI Xiang-me
Open publisher page 0 citations
Abstract
The effects of austenitizing and tempering temperature on the microstructure and mechanical properties of powder metallurgy high speed steel(PMHSS)S390were investigated.The results reveal that the microstructure of martensite,retained austenite and alloy carbide could be obtained in the samples high-pressure vacuum gas quenched(0.6MPa)and oil quenched after austenitizing at 1 190,1 230℃,the microstructure became fine alloy carbide and tempered martensite after high temperature tempering for three times.Moreover,the secondary hardening effect of S390steel was obvious,and the peak of secondary hardening was at 500℃and 540℃ for samples after high-pressure vacuum gas quenching and oil quenching.The hardness and compressive strength were 67.2HRC and above 3 862MPa,when the S390steel was experienced the optimal process,oil quenching at 1 230℃and two-hour tempering at 540℃twice then at 510℃ once.