Ultrasonic methods for the characterization of additively manufactured 316L stainless steel

• DOI: 10.1121/10.0015658
• Publication Date: 2022-11-28T22:36:56Z
• Authors: Colin L. Williams; Parisa Shokouhi; Matthew H. Lear; Carly Donahue; Colt J. Montgomery
• Keywords: Tensile testing; Characterization

This research utilizes linear and nonlinear ultrasonic techniques to establish a linkage between microstructure macroscale mechanical properties of additively manufactured (AM) stainless steel 316L samples. The specimens are using two methods: laser-powder bed fusion traditional wrought manufacturing. Using the method second harmonic generation, acoustic nonlinearity parameter is estimated in samples with different heat treatment levels intended alter microstructural properties. Linear parameters including wave speed resonant frequency additionally measured. Mechanical obtained through tensile testing coupons corresponding test Microstructural information for electron backscatter diffraction help elucidate relationships microstructure, properties, response. Results indicate correlations both ultimate strength yield strength, where generally decreases as sample increases, particularly AM We hypothesize that evolution grain characteristics across treatments influences trends measured nonlinearity, well substructures at smaller scales such dislocations. These results show promising evidence feasibility parts qualification nondestructive testing.