Laser Metal Deposition Process of Metals, Alloys, and Composite Materials by Rasheedat Modupe Mahamood

Author:Rasheedat Modupe Mahamood
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

A similar study was conducted by Mahamood and Akinlabi [8]. The influence of laser power on the microstructure and the microhardness property of laser metal deposited titanium alloy. The aim of the study was to help in the development of close loop control for the laser metal deposition process that could be useful for the fabrication of new part as well as in the repair of worn-out part. The microstructure showed from fine to coarse globular primary alpha from low to high laser power. Globular grains are the grain growth that occurred at the substrate due to heat transferred to the substrate from the melt pool region to the substrate.

Globular grains are shown in Fig. 5.10a. At lower laser power, the microstructure consists mostly of martensite and less Widmastätten alpha micro Widmastätten structure (see Fig. 5.10b) while the microstructure changed to more of Widmastätten as the laser power was increased. Also, the average microhardness was found to initially increase as the laser power was increased which then decrease as the laser power was further increased beyond 2.2 kW.

Fig. 5.10 a Optical micrograph of a sample produced with Nd: YAG laser power of 1.4 kW showing globular grains in the HAZ. b Optical micrograph of a sample produced with Nd: YAG laser power of 2.6 kW showing the martensite and Widmastätten grains [8]

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