Publication Date
2017
Document Type
Thesis
Committee Members
Joy Gockel (Committee Member), Nathan Klingbeil (Advisor), Sheldon Semiatin (Committee Member)
Degree Name
Master of Science in Materials Science and Engineering (MSMSE)
Abstract
Selective laser melting (SLM) is an additive manufacturing (AM) process that gives rise to large thermal gradients and rapid cooling rates that lead to the development of undesirable residual stress and distortion. In this work, a number of different techniques (i.e., x-ray-diffraction, hole-drilling, layer-removal, and contour) were utilized to establish the effect of process parameters on residual stress development during SLM of Ti-6Al-4V. The measurements indicated that higher laser power, slower scan speed, smaller stripe width, reduced substrate overhang, and reduced build plan area each reduce the level of residual stress. In addition, the correlation between microstructure, crystallographic texture, and residual stress were investigated using electron backscatter diffraction (EBSD) and backscatter electron (BSE) imaging. The experimental results from this work provide a quantitative foundation for future simulations of residual stress evolution during SLM and provide an informed understanding of residual stress development that can be used for process planning and improvement.
Page Count
118
Department or Program
Department of Mechanical and Materials Engineering
Year Degree Awarded
2017
Copyright
Copyright 2017, all rights reserved. My ETD will be available under the "Fair Use" terms of copyright law.
