Mechanical Properties of Additively Manufactured Stainless Steel

Eric W. Lum

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This research analyzes the effects of the Additive Manufacturing process, Direct Metal Laser Sintering technique, on the mechanical properties of 15-5 PH stainless steel. In order to understand how the material properties are effected by the AM process this research will analyze the effect of build orientation, heat treatment and strain rate on the material. The conducted research used quasi-static and Split Hopkinson Pressure Bar testing to evaluate the mechanical properties of 15-5PH stainless steel. This on-going research will extend the previous analysis of tension loading at high strain rates analysis to compression loading at high strain rates. Electron backscatter diffraction (EBSD) will be used to analyze the micro-structure of specimens to characterize the affect that the DMLS process has on the microstructure. The results of the compression testing will be compared to the results from the tension testing to compare the mechanical response to the two different load types.