Wear behavior of Al-Si alloy cylinder liner prepared by laser finishing

Laser finishing tests were carried out using a 1000 W, CO 2 continuous transverse-flow laser, with a defocusing value of 2 mm, and at different scanning speeds (200 mm/min, 400 mm/min, 600 mm/min, 800 mm/min, and 1000 mm/min). When the laser scanning speed was 600 mm/min, an Al-Si alloy cylinder liner gave the lowest friction coefficient and weight loss. Laser finishing could completely remove the aluminum layer and at the same time increase the silicon particles’ exposure with rounded edges. This microstructure improved the lubrication and bearing capacity, while it reduced adhesion and the friction force. Therefore, the friction coefficient and weight loss were lower with laser finishing than without.