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Characterization of microstructure, defects, and mechanical properties of additive manufactured nickel-base superalloys

Stevens, Erica (2015) Characterization of microstructure, defects, and mechanical properties of additive manufactured nickel-base superalloys. Undergraduate Thesis, University of Pittsburgh. (Unpublished)

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Abstract

Due to the excellent high-temperature performance of nickel-based superalloys and the need for complicated geometries and simple repairs, methods of creating nickel-based superalloy parts by additive manufacturing (AM) are currently being developed. In this study, Laser Engineered Net Shaping (LENS) is used as the AM process to create samples, and Inconel 718 is used as the nickel-based superalloy. LENS is an AM method that uses a laser to selectively melt metal powder, while introducing additional powder in order to add to the volume of the melt pool. This process is commonly used for part repair; however, the processing parameters and resulting structure and properties of the material are not yet fully understood. This study characterizes Inconel 718 samples fabricated using LENS printing using optical microscopy, energy-dispersive X-ray spectrometry, scanning electron microscopy, electron backscatter diffraction, and Vickers microhardness, and proposes explanations for the results based on the printing process.


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Details

Item Type: University of Pittsburgh ETD
Status: Unpublished
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Stevens, Ericaels119@pitt.eduELS119
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Thesis AdvisorChmielus, Markuschmielus@pitt.eduCHMIELUS
Committee MemberTo, Albertalbertto@pitt.eduALBERTTO
Committee MemberNettleship, Iannettles@pitt.eduNETTLES
Committee MemberDunand, Daviddunand@northwestern.edu
Date: 27 April 2015
Date Type: Publication
Defense Date: 7 April 2015
Approval Date: 27 April 2015
Submission Date: 15 April 2015
Access Restriction: 2 year -- Restrict access to University of Pittsburgh for a period of 2 years.
Number of Pages: 72
Institution: University of Pittsburgh
Schools and Programs: University Honors College
Swanson School of Engineering > Materials Science and Engineering
Degree: BPhil - Bachelor of Philosophy
Thesis Type: Undergraduate Thesis
Refereed: Yes
Uncontrolled Keywords: LENS, laser engineered net shaping, Inconel 718, additive manufacturing, microstructural characterization
Date Deposited: 27 Apr 2015 14:19
Last Modified: 27 Apr 2017 05:15
URI: http://d-scholarship.pitt.edu/id/eprint/24898

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