Effects of destabilized and tempered treatment on microstructure and wear resistance of Cr15 high chromium cast iron（HCCI）were analyzed.The results reveal that destabilizing treatment at 950℃and 1 000 ℃ can promote the secondary carbide precipitation and martensite’s transformation.Asquenched HCCI consists of martensite

retained austenite

primary and secondary carbides

improving the matrix hardness.The low-temperature tempering can relief the stress concentration to take acceptable toughness.Under the experimental condition

quenched at 1 000℃for 3hfollowed by air quenching and tempered at 250 ℃for 6h

the Cr15 HCCI has excellent mechanical properties.Finally

hardness and unnotched impact absorbing energy reach 61.4 HRC and 7.3J

respectively.In dry friction wear state

the as-cast and as-quenched HCCI exhibit mainly abrasive wear.As-tempered HCCI can improve the toughness

and the wear mechanism is mainly characterized by adhesive wear.After 6hdry friction

the wear mass loss is decreased from 43.0mg to 28.8mg.