Browsing by Subject "17-4PH"
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Item Evaluating the Corrosion Performance of Wrought and Additively Manufactured (AM) Invar ® and 17-4PH(University of Texas at Austin, 2019) Grech, I.S.; Wint, N.; Mehraban, S.; Sullivan, J.; Lavery, N.A Renishaw AM 400 was used to produce Laser Powder Bed fusion (LPBF) iron alloy Invar ® and 17-4PH components. Build parameters were systematically changed and the corrosion performance of the samples produced was investigated using a combination of scanning vibrating electrode technique (SVET) and advanced conventional electrochemical techniques. The results indicated that small changes in the density of the LPBF parts due to porosity resulted in large changes to the materials corrosion susceptibility. The LPBF samples also demonstrated significantly more variation in pitting potential measurements compared to wrought samples indicating inhomogeneity in the built parts. References to AM samples in this work refer to samples produced using LPBF.Item PRINTING PARAMETER OPTIMIZATION OF EXTRUDED METAL PASTE BY RESPONSE SURFACE TECHNIQUE(University of Texas at Austin, 2023) Norris, Marshall; Fidan, IsmailThis research is focused on optimizing printing parameters using the response surface (RS) methodology. When printing parameters are not optimized, the resulting prints contain an unacceptable surface finish, porosity, or the print fails entirely as the lower portion of the print will not be able to withstand the weight of consecutive layers. Printing parameters, layer height, and percent infill were adjusted for the study while material flow rate and print head speed were held constant. RS is a statistical based eigenvalue process that uses data points on a three-dimensional curve to predict and identify local maxima or minima. For this study, RS was used to identify the inflection point where surface finish is optimized. A starting point for the parameters begins with rheological characterization of the paste and geometric modeling (or brute force approach). Once the parameters are able to produce an acceptable surface finish, the RS approach was used to refine printing parameters.