Direct Metal Deposition Of Waspaloy Wire Using Laser And Arc Heat Sources

Nur Izan Syahriah, Hussein (2010) Direct Metal Deposition Of Waspaloy Wire Using Laser And Arc Heat Sources. PhD thesis, University of Nottingham.

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In the manufacture and repair of parts by direct metal deposition (DMD) it is common to inject powder into a molten pool formed by laser heating. However, a wire feedstock offers potential advantages and was employed in the present study of multilayer deposition of Waspaloy, in the form of walls using a high power diode laser (HPDL) or gas tungsten arc weld method (GTAW). Understanding the microstructure and mechanical properties of the materiaL especially one such as Waspaloy which is used in aerospace engines, is crucial to ensure its performance. Building parts layer-by-layer causes dynamic changes in the underlying substrate and the previously deposited layers due to the thermal cycling experienced. The heating and cooling rates during the deposition process affect the microstructure of the alloy which has an important impact on the mechanical properties of the material. Solidification of Waspaloy during the DMD process leads to dendritic segregation and interdendrtic carbide formation which can strongly influence the mechanical properties of the deposited structure. Heat treatment can be the principal means of altering the microstructure and optimising the mechanical properties. Hence, solution treatment and ageing was performed on the deposited structure. In this thesis, the macro- and microstructural evolution were investigated and the deposits were characterized by optical microscopy, scanning electron microscopy, x-ray diffraction, differential scanning calorimetry, microhardness testing and tensile testing. Results from the microstructural and mechanical properties are then related to the thermal cycles arising from layer deposition.

Item Type: Thesis (PhD)
Uncontrolled Keywords: Composite materials, Metallic composites
Subjects: T Technology > T Technology (General)
T Technology > TL Motor vehicles. Aeronautics. Astronautics
Divisions: Library > Tesis > FKM
Depositing User: Burairah Hussin
Date Deposited: 10 Jun 2015 07:23
Last Modified: 17 Nov 2015 10:41
Statistic Details: View Download Statistic

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