Additive Manufacturing for Energy Applications II: Poster Session
Sponsored by: TMS Structural Materials Division, TMS: Nuclear Materials Committee
Program Organizers: Isabella Van Rooyen, Pacific Northwest National Laboratory; Subhashish Meher, Pacific Northwest National Laboratory; Indrajit Charit, University of Idaho; Michael Kirka, Oak Ridge National Laboratory
Monday 5:30 PM
February 24, 2020
Room: Sails Pavilion
Location: San Diego Convention Ctr
Session Chair: Michael Kirka, Oakridge National Laboratory
A-11: Characterization of Cold-spray Based Additively Manufactured Thick Copper Deposits: Danish Verma1; Surinder Singh2; Harpreet Singh2; 1Punjab Engineering College Chandigarh; 2Indian Institute of Technology Ropar (IIT Ropar)
The feasibility of the cold-spray process as an additive manufacturing technology to produce a stand-alone product has been explored. In lieu of which, thick (20mm) copper plates were fabricated using the cold-spraying technology. Heat-treatment of the plates was performed to improve their properties. The plates were characterized before and after heat-treatment using various techniques viz; scanning electron microscopy/energy dispersive spectroscopy (SEM/EDS), X-ray diffraction (XRD), microhardness, nanoindentation, porosity and density measurements, electrical and thermal conductivity measurements, and macro and micro-tensile testing. SEM/EDS showed a dense oxide-free structure with marginal porosity, which was further validated by XRD analysis. Novelty of the article includes the in-situ micro-tensile testing of the plates, which illustrates the fracture behaviour of the cold-sprayed plates. Properties of the plates achieved after heat-treatment were found comparable to that of bulk copper, which forecasts the capability of the process to be used as an additive manufacturing technology.
A-12: Evaluation of Cold-sprayed 14YWT: Jeffrey Graham1; Mia Lenling2; Hwasung Yeom2; Peter Hosemann1; Kumar Sridharan2; 1University of California, Berkeley; 2University of Wisconsin
The demands of next-generation nuclear power require materials that are capable of service in high fluence environments. Oxide dispersion strengthened steel alloy 14YWT holds promise if it can be effectively and efficiently manufactured. Cold spraying 14YWT has been explored and its resulting material properties have been compared to conventionally hot extruded 14YWT. Impacts of the heat treatment of spray formed samples upon the yield and ultimate tensile stress have been explored, in order to balance material strength with the critical nanostructure distribution of the alloy.
A-13 Microstructure and Mechanical Properties of ODS Eurofer Steel Produced by Selective Laser Melting: Jia Fu1; I.M. Richardson1; M.J.M. Hermans1; 1Delft University of Technology
Oxide dispersion strengthened (ODS) steels are considered to be one of the candidate structural materials for advanced nuclear applications due to their high elevated-temperature strength, corrosion resistance and radiation tolerance. Current research interest on the fabrication of ODS steels has concentrated on the additive manufacturing techniques, because traditional production routes, i.e. the powder metallurgy processes, cause a long manufacturing period, high costs of production and limitations in the form of the consolidated material. In this study, selective laser melting (SLM) was successfully applied to consolidate the as-mechanical alloyed ODS Eurofer powder to fabricate thin walled structures. The microstructure was characterised by optical microscopy (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The effects of processing parameters on the microstructure and mechanical properties of the as-produced material were investigated in detail. It is shown that SLM is a promising technique to fabricate high-performance ODS Eurofer.