Product Code: ICAL08_501

A Numerical-Experimental Investigation on the Deposition of Ti-45Nb on Mild Still using Automated Laser Fabrication Process
Authors:
Amir Khajepour, University of Waterloo; Waterloo ON Canada
Vahid Fallah, University of Waterloo; Waterloo ON Canada
Masoud Alimardani , University of Waterloo; Waterloo ON Canada
Presented at ICALEO 2008

Automated Laser Fabrication process (Laser Cladding) has shown tremendous potential for various applications such as rapid prototyping, coating, and production of functionality graded parts. Parallel to other technical challenges involved in this method, exploring different materials and alloys with novel properties that can be adopted for the fabrication process using ALFa is another priority for the research in this field. Ti-45Nb is an attractive alloy because of its low modulus of elasticity, high corrosion resistance, significantly increased threshold oxygen pressure for ignition (from that of pure Titanium) and superior biocompatibility. In this paper, different aspects of the deposition of premixed powder Ti-45Nb on mild still are studied. To gain better insight into the nature of the deposition of this alloy, a 3D time-dependent numerical model is developed in which all material properties are considered to be temperature-dependent. The model is used to correlate the microstructure and the phases formed at different processing parameters with the interaction time between the laser beam and the powder or in turn the heating and the cooling rates during the process.