Effects of Laser Melting Treatment on Cavitation Erosion of 17-4PH Steel

Abstract:

Cavitation erosion behavior of 17-4PH steel used for large turbine blades and laser surface melting layer were investigated in simulated seawater 3.5%NaCl solution through an ultrasonic vibration system. The microstructure and the eroded surface and cross-section morphology were observed by SEM and OM, then the results were compared and analyzed. The results showed that the microstructures of 17-4PH stainless steels consist of martensitic matrix, ferrite and residual austenite. Compared with 17-4PH substrate, it found the microstructure of laser surface melting treatment became dense and homogenous, the microhardness increased 80HV. During cavitation test, the cavitation incubation period of laser surface melting sample raised 1 time than 17-4PH steel, and enhanced its cavitation resistance through fine grain strengthening.

• Periodical: Advanced Materials Research (Volumes 631-632)
• Pages: 700-703
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.631-632.700
• Online since: January 2013
• Authors: Song Zhang, Xu Bian, Yu Hang Ren, Chao Wang, Chun Hua Zhang
• Keywords: 17-4PH Stainless Steel, Cavitation Resistance, Fine Grain, Laser Melting Treatment

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