Abstract
For additive manufacturing (AM), the certification and qualification paradigm needs to evolve as there exists no “ASTM-type” additive manufacturing certified process or AM-material produced specifications. Accordingly, utilization of AM materials to meet engineering applications requires quantification of the constitutive properties of these evolving materials in comparison to conventionally-manufactured metals and alloys. Cylinders of 316L SS were produced using a LENS MR-7 laser additive manufacturing system from Optomec (Albuquerque, NM) equipped with a 1kW Yb-fiber laser. The microstructure of the AM-316L SS is detailed in both the as-built condition and following heat-treatments designed to obtain full recrystallization. The constitutive behavior as a function of strain rate and temperature is presented and compared to that of nominal annealed wrought 316L SS plate. The dynamic damage evolution and failure response of all three materials was probed using flyer-plate impact driven spallation experiments at a peak stress of 4.5 GPa to examine incipient spallation response. The spall strength of AM-produced 316L SS was found to be very similar for the peak shock stress studied to that of annealed wrought or AM-316L SS following recrystallization. The damage evolution as a function of microstructure was characterized using optical metallography.
Highlights
Additive manufacturing (AM) technology is a key enabling technology fueling the revolutionary transformations occurring in rapid prototyping, freeform and net-shape manufacturing, and local production at a global scale
The purpose of this study is to report initial constitutive and dynamic fracture properties of 316L SS produced by Laser Engineered Net Shaping (LENS) additive manufacturing in comparison to wrought 316L SS as a result of their microstructures
The constitutive and spallation response of 316L SS fabricated via LENS additive manufacturing is compared to that of annealed wrought 316L SS and the AM-as-built material following recrystallization, termed AM-Rx
Summary
Additive manufacturing (AM) technology is a key enabling technology fueling the revolutionary transformations occurring in rapid prototyping, freeform and net-shape manufacturing, and local production at a global scale. Even for small changes in starting feed material (powder or wire), component geometry, build process variables, and post-build thermo-mechanical processing, the qualification cycle can be complicated leading to long implementation times for even minor changes. This is due in large part to the fact that we are not able to predict and control processingstructure-property-performance (PSPP) relationships [6,7,8]. For AM materials and components to meet qualification and certification requirements for critical engineering applications, key microstructural parameters and defects must be quantified and quantitatively linked to processing and equipment parameters to establish minimum performance properties [9]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
