Date of Award

3-24-2016

Document Type

Thesis

Degree Name

Master of Science in Aeronautical Engineering

Department

Department of Aeronautics and Astronautics

First Advisor

David Liu, PhD.

Abstract

Experimental research was conducted to determine the dynamic properties and characterize the microstructure of 15-5PH Stainless Steel manufactured through Direct Metal Laser Sintering (DMLS) additive manufacturing (AM) processes and heat treated using common heat treatment protocols. A thorough understanding of the material's properties is necessary before such parts are utilized in an operational capacity. Of the five builds, two deviated significantly from the specified composition of 15-5PH stainless steel. The remaining three builds, possessing the desired composition and crystalline structure, were tested in compression and tension at two strain rates. Tension tests using a reflected wave and a momentum trap SHB setup collected data reflecting a natural variation within builds and across builds and orientation of typically less than 7%. A slight build orientation bias is noted resulting in higher ductility of the horizontal build orientation compared to the vertical of the same material. A simplistic linear interpolation of true stress-strain curves show fairly consistent strain softening trends at higher strain rates across the material subject sets.

AFIT Designator

AFIT-ENY-MS-16-M-205

DTIC Accession Number

AD1054545

Comments

Title entry as shown on cover page.

Alternative title: Dynamic Properties of Additively Manufactured 15-5PH Stainless Steel

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