Abstract
Laser surface remelting of hyper-eutectic Al20 and 30 mass%Si cast alloys with CO 2 laser beam has been fined to improve the wear resistance of these alloys. A continuous wave CO 2 laser beam with the power of 5kW was irradiated on these AlSi cast alloy substrates under various defocused distance of laser beam with the argon gas shielding. The microstructure of the laser-remelted layer consisted of fine primary Si particles, primary α-Al matrix phase and fine α-AlSi eutectic phase. The size of the primary Si particle decreased from 25 to 3 μm with the defocused distance also decreasing. Fine primary Si particles were distributed uniformly in the matrix of the fully remelted layer. The hardness of the laser remelted layer increased gradually with the decrease of the primary Si particle size, which reached 140 HV at about 5 μm in Al30 mass%Si layer. The wear resistance of the remelted layer increased with increasing the hardness and decreasing the size of primary Si particle. The wear resistance of the remelted layer in Al30 mass%Si cast alloy was better than that of the Al20 mass%Si cast alloy.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.