Materials Science Engineering Seminar

Fri, Apr 9, 2021 1:00 pm - 2:00 pm


Speaker: Aeriel Murpy-Leonard, Assistant Professor, Materials Science & EngineeringThe Ohio State University

Title: Investigation of Porosity, Texture and Defonnation Behavior Using High Energy X-rays During In-Situ Tensile Loading In Additively Manufactured 3 l 6L Stainless Steel 

Abstract: The evolution of damage, texture, and strain in additive manufactured (AM) 316L stainless steel produced via laser powder bed fusion was investigated during in-situ tensile loading using high energy X-rays. Synclu·otron X-ray computed tomography (XCT) measurements were perfonned to determine the initial porosity and monitor the evolution of porosity during tensile loading as well as detect the initiation and growth of voids from pre-existing pore defects in the specimens. The as-built tensile specimens had a cross-sectional area of 1 mm2, which was chosen in order to understand damage behavior in thin-walled strnctures. Far-field X-ray diffraction measurements were perfonned to quantify c1ystallographic texture and the distribution of internal elastic strains during loading. The initial texture from the AM build process had a weak {220} texture aligned parallel to the build direction. As a result of tensile defonnation, a str·ong {lll} + {200} double fiber texture develops at high tensile str·ains and remains until fracture. XCT results confirmed that the inhomogeneous distr·ibution of porosity near the surface played a significant role in damage evolution during tensile loading where voids and cracks initiated at pre-existing pores located within the contour zone. These pores were found to have asymmetric or irregular morphology. At high tensile str·ains, the massive accumulation of internal damage at these pores eventually c01mected to the surface reducing the ductility in these thin-walled AM samples and resulting in fnal failure. 

via Zoom
Sherri Tatum
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