Product Code: ICAL09_804

Thermal Control Managing for In-Situ Synthesis of Ti-C-Fe System by Laser Cladding on Carbon Steel
Authors:
Ali Emamian, University of Waterloo; Kitchener-Waterloo ON Canada
Stephen Corbin, University of Waterloo; Waterloo ON Canada
Amir Khajepour, University of Waterloo; Waterloo ON Canada
Presented at ICALEO 2009

In-situ laser cladding enables the formation of a uniform clad by melting the powder and substrate to form a composition from pure powder components. Since TiC has desirable properties such as hardness, wear and corrosion resistance, titanium (Ti) and graphite (C) are used as a composite material (i.e., TiC) to increase hardness and wear resistance of AISI 1030 carbon steel. To increase the corrosion, erosion, and wear resistance of a low grade material substrate the entire substrate surface must be coated by the multi-track cladding. Preliminary experiments indicate that deposition of multi-track of TiC-Fe base composite results in delamination and micro cracks. In this paper, the thermal gradient of the clad is managed by controlling the applied heat input. Formation of probable brittle phase according to Fe-Ti phase diagram is taken into account in different thermal histories. Moreover, the laser parameters such as laser power and scan speed in different layers are changed to control the input heat. Results show that by thermal controlling of the deposition, uniform clad can be achieved in multi-track deposition. The clad is free of cracks and porosities. Also, the resulting clad reveals strong metallurgical bonding with the substrate. XRD, SEM and EDS data show that TiC particles are built up uniformly during the laser cladding process in the iron matrix.