Session: MF-17-02 Advanced and Additive Manufacturing and Material Technologies (joint with D&A)

Paper Number: 84723

84723 - Fracture and Tensile Characterization of Additively Manufactured Type 300 Series Stainless Steel in the Baseline and Hydrogen and Tensile Characterization of Additively Manufactured Type 304l Stainless Steel in the Baseline and Hydrogen Charged Conditions 

Savannah River National Laboratory (SRNL) is characterizing powder bed fusion processed Type 304L stainless steel for use as hydrogen storage and process vessels.  As part of this characterization, a simple cylinder (C-cylinder) with an appropriate thickness and a “D-cylinder” were fabricated using two different Laser Powder Bed Fusion (L-PBF) machines at two different sites.  These four sample cylinders were electrical discharge machined (EDM) into cylindrical blanks and rectangular blanks and subsequently finished machined into tensile samples and single edge notched three-point bend fracture toughness samples, respectively.  The microstructures of the cylinders were optically characterized parallel to the build direction and perpendicular to the build direction at three elevations.  Samples were hydrogen charged using conditions to generate approximately 80 wppm hydrogen.  The sub-sized cylindrical tensile samples and fracture toughness samples were non-destructively characterized using computed tomography with a voxel size of nominally 80 microns.  Metallographic analysis and CT indicated the samples are virtually pore free and exhibit the expected microstructure of L-PBF processing.  The mechanical test samples will be tested in the baseline and hydrogen charged conditions to determine the tensile and fracture toughness behavior at sub-ambient and room temperatures; based on previous results, the baseline tensile and fracture properties are expected to be comparable to wrought material and the hydrogen properties exhibit similar characteristics to wrought materials.  Fractography results will also be shared.  This paper will describe the sample fabrication, preparation, and fracture toughness and tensile test results with comparison to previous data for this alloy. 

Presenting Author: Paul Korinko Savannah River National LAb

Presenting Author Biography: Dr. Paul Korinko

Authors:

Timothy Krentz Savannah River National Lab
Paul Korinko Savannah River National LAb
Anthony Mcwilliams Savannah River National Lab