Effect of microstructure on wear resistance of 4Cr5MoSiV1 steel at room and elevated temperature

Dry wear tests were conducted on a pin-on-disc friction and wear tester for 4Cr5MoSiV1 steel with various microstructure in atmospheric environment at room temperature(25 ℃) and 400 ℃.The effects of microstructure on wear resistance of the steel were studied and wear mechanisms were analyzed.The results show that wear mechanism at 25 ℃ for 4Cr5MoSiV1 steel is adhesive wear.The wear resistance not only depends on hardness of the materials,but also is closely.related with its fracture resistance.The wear mechanism is oxidation wear at 400 ℃,but which is already beyond the mild Quinn type oxidation wear.The wear resistance is dominated by the hardness,toughness and thermal stability of materials.The wear-resistance microstructure at room temperature should have high hardness and a certain fracture resistance.While high thermal stability,high hardness,and a proper fracture toughness are essential to the wear-resistant microstructure at elevated temperature.