172. characterization of microstructure and material properties of direct laser deposited ni-alloy 625

Department: Mechanical & Aerospace Engineering
Research Institute Affiliation: Graduate Program in Materials Science and Engineering
Faculty Advisor(s): Kenneth S. Vecchio | Paresh Mukhedkar

Primary Student
Name: Paresh Mukhedkar
Email: pmukhedk@ucsd.edu
Phone: 858-822-7922
Grad Year: 2018

Student Collaborators
Kevin Kaufmann, krkaufma@ucsd.edu | Tyler Harrington, tjharrin@eng.ucsd.edu

Abstract
Additive manufacturing is becoming an important tool in fields including rapid prototyping and custom parts fabrication. While traditional metallurgy lacks the control of site-specific microstructure and material properties, additive layer-by-layer fabrication methods offer variability during the manufacturing process, and therefore tunability of the location-specific properties of the end product. To demonstrate this novel precision controlled processing technique, bulk samples of Ni-alloy 625 were manufactured using selective laser sintering, laser input power varied from 1.2 kW to 2 kW in 0.4 kW steps. To determine the effect of laser power on texture and microstructural development, optical microscopy and electron backscatter diffraction (EBSD) were utilized. The effect of 2Ám TiC and 50Ám WC additives on grain refinement and material properties was also studied. Hardness variation throughout the samples was quantified in order to connect location specific mechanical properties to microstructure and processing parameters, and comparison to wrought 625 will be made. Overall this work serves to advance knowledge of the processing-microstructure-property relationships of laser additive manufactured Ni-based superalloys.

Industry Application Area(s)
Aerospace, Defense, Security | Materials

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