Abstract
The cavitation behaviour of Cr-Mo-Cu alloy cast iron (cylinder liner material of diesel engines) samples processed by a continuous wave CO 2 laser was investigated with a magnetostriction apparatus. Untreated samples manifested the lowest resistance to cavitation erosion. Laser surface-fused and phase transformation hardened samples came next, but the improvement was very small. Samples clad with a Co 50 alloy by means of a laser exhibited excellent cavitation resistance, so much so that no erosion hole was created on the surface of the alloy layer after a 600 min cavitation test. The main mechanism in the cavitation erosion process for each microstructure is described and discussed.
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