Development of a Processing Window for the Transformation Hardening of Nickel-Aluminium-Bronze
Nickel-Aluminium-Bronzes (NAB) are typically used in marine applications because of their good combination of corrosion resistance and strength. Even though these alloys exhibit good properties they do suffer from wear, corrosion, dealloying, cavitation corrosion-erosion or corrosion fatigue during service. Therefore methods of increasing the resistance of this class of alloy to surface sensitive damage mechanisms are desirable. Transformation hardening through laser processing offers the potential to increase the resistance of these alloys surface sensitive mechanisms of damage and increase their life. A processing window has been developed through the use of an analytical heat transfer model to determine laser processing parameters that are close to the critical temperature for surface melting. The absorption of the laser by NAB has been determined and the processing window calculated taking into account the velocity of the laser, laser spot size and type as well as laser power.
Jian-Feng Nie and Allan Morton
R. Cottam and M. Brandt, "Development of a Processing Window for the Transformation Hardening of Nickel-Aluminium-Bronze", Materials Science Forum, Vols. 654-656, pp. 1916-1919, 2010