Influence of laser scanning speed on nitrided Ti6Al4V surface

Singh, Swarnima and Tiwary, S K and Singh, Raghubir (2018) Influence of laser scanning speed on nitrided Ti6Al4V surface. Surface Engineering, online .

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The influence of laser scan speed during nitriding in the range 30–150 cm min−1 on the physical properties, microstructure and corrosion behaviour of Ti6Al4V was studied. The surface energy of nitrided Ti6Al4V remained almost constant up to the scan speed of 60 cm min−1 followed by an increase in the maximum value at 80 cm min−1. A gradual drop in the microhardness of the coating from the outermost surface was noticed for specimens nitrided up to 80 cm min−1; an abrupt decrease, however, was found at a scan speed ≥100 cm min−1. The laser nitriding produced dendritic microstructure; an exponential decay in the secondary dendrite arm spacing (SDAS) with the increase in laser scan speed was revealed. The SDAS produced was smaller at the interphase and centre of the coating, compared to that at outermost surface. The passivation behaviour of Ti6Al4V at lower potentials shifted to the smaller current side after laser nitriding.

Item Type:Article
Official URL/DOI:
Uncontrolled Keywords:Corrosion, laser nitriding, microhardness, anodic polarisation, secondary dendrite arm spacing, surface energy
Divisions:Material Science and Technology
ID Code:7880
Deposited By:Dr. A K Sahu
Deposited On:26 Oct 2018 13:04
Last Modified:26 Oct 2018 13:04
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