Investigation on microstructures and tribological characteristic of laser remelting layers

In order to investigate the tribological performance of laser remelting layers, laser remelting processes were carried out on grey cast iron matrix. The microstructures consist typical γ austenite dendrite distributed on the eutectic substrate and the microhardness varies from HV0.2 800 to HV0.2 1 200. The optimal SRV tests were carried out using laser remelting layers as upper samples and grey cast irons as low samples. The morphologies of worn scars were observed with scanning electron microscopy (SEM). The SRV tests show that the laser remelting processes reduce the wear losses of wear couple and lower the friction coefficient (0.072 8～0.082 2). The wear mechanism is abrasive wear.