Modelling of Process Parameters Influence on Degree of Porosity in Laser Metal Deposition Process
Additive manufacturing process is an advanced manufacturing process that fabricates component directly from the three dimensional (3D) image of the part being produced by adding materials layer by layer until the part is completed. Laser Metal Deposition (LMD) process is an important additive manufacturing technique that is capable of producing complex parts in a single manufacturing run. A difficult to manufacture material such as Titanium and its alloys can readily be manufactured using the LMD process. Titanium and its alloys possess excellent corrosion properties that made them to find applications in many industries including biomedical. The biocompatibility of Ti6Al4V made then to be used as implants. Porous implants are desirable in some applications so as to reduce the weight as well as to aid the healing and proper integration of the implant with the body tissue. In this chapter, the effect of laser power and scanning speed on the degree of porosity was investigated and empirically modelled in laser metal deposition of Ti6Al4V. The model was developed using full factorial design of experiment and the results were analyzed using Design Expert software. The model was validated and was found to be in good agreement with the experimental data.
KeywordsDesign of experiment Laser metal deposition Medical implants Model Porosity Processing parameters Titanium alloy
This work is supported by the Rental Pool Grant of the National Laser Centre–Council of Scientific and Industrial Research (NLC–CSIR), Pretoria South Africa.
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