Comparative Study of Two Laser Coatings Used in Turbine Blades

Abstract:

In order to compare the performances of two typical laser coatings used in turbine blades, the Ti-N coatings of Ti6Al4V alloy and solution-aging coatings of 17-4PH alloy were fabricated by laser treatment with optimized parameters, respectively. The formation mechanisms and performances are comparative investigated by SEM, TEM and cavitation erosion tester. The results show that the Ti-N coatings are mainly reinforced by Ti₂N and α′ martensite. For 17-4PH samples, the TEM observation displays that the ε-Cu particles, which are in the size of 2-5 nm and disperse homogeneously in the martensite matrix, are the main reinforcing phases. Both the 17-4PH samples and the Ti6Al4V samples are reinforced homogeneously. Comparative Analysis indicates that the hardness of the Ti-N coatings on Ti6Al4V substrate is lower than that of solution-aging samples (on 17-4PH). However, the cavitation erosion resistance of the Ti-N coatings are better than that of solution-aging samples, which implies that the titanium alloy with Ti-N coatings are well candidate to instead of 17-4PH steel for the application in turbine blades.

• Periodical: Applied Mechanics and Materials (Volume 711)
• Pages: 193-196
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.711.193
• Online since: December 2014
• Authors: Wei Fu Wang*, Jian Zhou Xie, Liu Yi Huang, Fang Fang Zhang
• Keywords: 17-4PH Stainless Steel, Cavitation Erosion, Laser Treatment, Precipitation Hardening, Titanium Alloy

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