Abstract
Surface modification of austenitic stainless steels S31603, S30400 and super duplex stainless steel S32760 was achieved by laser surface melting using 2 kW continuous wave Nd-YAG laser. The cavitation erosion and corrosion characteristics of laser surface melted stainless steels in 3.5% NaCl solution at 23°C were studied by means of a 20 kHz ultrasonic vibrator at a peak-to-peak amplitude of 30 mm and a potentiostat respectively. In a series of 4 h cavitation tests, the cavitation erosion resistance of laser-melted S31603 with 50% overlapping of melted tracks was found to be improved by 22% at 23°C as compared with the as-received specimen and very close to that of the as-received S30400. No improvement on the cavitation erosion resistance of S30400 and S32760 was found. The pitting potential of laser-melted S31603 increased from 359 to 452 mV at 23°C. The deformation mechanism by cavitation and the pitting morphology of the laser-melted stainless steels were discussed in terms of microstructure and residual stress.
Original language | English |
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Pages (from-to) | 295-304 |
Number of pages | 10 |
Journal | Surface and Coatings Technology |
Volume | 99 |
Issue number | 3 |
DOIs | |
Publication status | Published - 23 Feb 1998 |
Keywords
- Austenitic stainless steels
- Cavitation erosion
- Corrosion
- Laser surface melting
- Super duplex stainless steel
ASJC Scopus subject areas
- General Chemistry
- Condensed Matter Physics
- Surfaces and Interfaces
- Surfaces, Coatings and Films
- Materials Chemistry