Theses and Dissertations

Issuing Body

Mississippi State University

Advisor

Priddy, Matthew W.

Committee Member

Doude, Haley R.

Committee Member

Bian, Linkan

Date of Degree

8-9-2022

Document Type

Graduate Thesis - Open Access

Major

Mechanical Engineering

Degree Name

Master of Science (M.S.)

College

James Worth Bagley College of Engineering

Department

Department of Mechanical Engineering

Abstract

Wire-arc additive manufacturing (WAAM) is becoming increasingly common for large scale additive manufacturing (AM) applications because of its high deposition rate (2-3 kg/hr.). The rapid temperature changes and subsequent evolution of mechanical properties during AM can lead to large distortion and residual stresses. Finite element modeling of the AM process shows promise to minimize part distortion and residual stresses through improved path planning and process parameter optimization. However, accurate material properties of M250 before and after heat treatment are needed to properly characterize the property evolution from annealed to AM, to aged. Due to limited data on annealed M250, this research presents the mechanical response of solution annealed M250 maraging steel. Testing at temperatures up to 900 degrees Celsius and strain rates from quasi-static to 1 s-1 was performed to provide more representative mechanical properties for AM parts and provide a correlation between AM, aged, and annealed M250 maraging steel.

Sponsorship

National Center for Manufacturing Sciences (NCMS) and US Army Research Laboratory (ARL); Collaboration Agreement #202031-141054 CTMA Cooperative Agreement #HQ0034-15-2-0007

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