Influence of pulsed Nd:YAG laser welding power on the microstructures and nano creep behaviour of Ti5Al2.5Sn beads

Abstract

Pulsed Nd:YAG laser beam welding was performed at five different power levels (360 W, 380 W, 400 W, 420 W and 440 W), and the relationship between microstructure and nano creep behaviour was investigated for Ti5Al2.5Sn alloy. Microstructural analysis indicated a reduction in grain size in fusion zone, with an increase in the average laser power. In the fusion zone (FZ) of all the beads, acicular α and ά martensite were observed and confirmed by SEM analysis. Due to the formation of the α and ά phases during welding, the microhardness and nanohardness in the FZ increased by ∼71% and ∼58%, respectively, above that of the base alloy. Nano creep analysis suggested diffusional creep as the deformation mechanism in all the beads, except the one performed at an average power of 440 W since its stress exponent was less than 2.

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“…Inconel 718 is a precipitation-hardened nickel-based superalloy and it is a most suitable material for fabricating the components in the aerospace, and chemical industries due to its good mechanical properties and better corrosion resistance at elevated temperatures [1,2]. However, the machinability of Inconel 718 is a challenging task due to the above said properties alongwith its high strength and hardness [3,4].…”

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