Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/40756
Title: Laser surface melting of Martensitic stainless steel 440C for enhancing corrosion resistance
Authors: Kwok, CT
Lo, KH
Cheng, FT
Man, HC 
Keywords: Corrosion
Lasers
Resistance
Scanning
Nd:YAG lasers
Particles
Polarization
Issue Date: 2002
Publisher: SPIE-International Society for Optical Engineering
Source: Proceedings of SPIE : the International Society for Optical Engineering, 2002, v. 4831, 493 How to cite?
Journal: Proceedings of SPIE : the International Society for Optical Engineering 
Abstract: Surface modification of martensitic stainless steel 440C was achieved by laser surface melting using a 2-kW continuous wave Nd:YAG laser. The corrosion characteristics of laser-melted specimens fabricated under different processing parameters in 3.5% NaCl solution at 23°C were studied by potentiodynamic polarization technique. The pitting corrosion resistance of all laser-melted specimens was significantly improved, as evidenced by a shift of the pitting potential in the noble direction, a wider passive range, and a lower passive current density. The pitting potential of the laser-melted specimen fabricated under a power density of 4.2 kW/cm2 and a scanning speed of 25 mm/s (specimen P12-440C-25) was increased to 200 mV (SCE), which was much higher than that of annealed and conventionally heat-treated 440C. The pitting corrosion characteristics of the laser-melted specimens were strongly dependent on the processing conditions which resulted in different microstructures. The enhanced pitting resistance resulted from the combined effect of dissolution or refinement of carbide particles and the presence of retained austenite. By using different processing parameters, it was found that the pitting resistance of the laser-melted specimen P12-440C-25 was the highest by virtue of a high volume fraction of retained austenite and a small amount of precipitated carbide.
Description: First International Symposium on High-Power Laser Macroprocessing, Osaka, Japan, 27-31 May 2002
URI: http://hdl.handle.net/10397/40756
ISSN: 0277-786X
EISSN: 1996-756X
DOI: 10.1117/12.497599
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