The microstructure and properties of ZG40Cr25Ni20steel with 5%Al

0.6%Ti and 0.6%W after solution treatment were investigated.The results indicate that the tensile strength of ZG40Cr25Ni20is increased with the addition of alloying elements

and the elongation is decreased to about 11%of the ones before addition

which presents brittle fracture.However

the high temperature elongation is increased significantly with many dimples and tearing edges existing on the tensile fracture surface

and high toughness at high temperature is presented.With the addition of Al

Ti and W elements

after 1 200℃×5hoil cooled

the hardness is increased further due to the formation of Ni

3

Al phase and TiC and WC particles with high hardness and high stability

where the wearresistance at room temperature and 600℃dry friction condition are improved.