Process-Structure-Corrosion/SCC Property Study of High Deposition Rate AM 316L, 20-000001118
Abstract
316L produced via conventional wrought-processing techniques is a workhorse material that is used in a variety of DoD and commercial applications. The advent of additive manufacturing (AM) provides the opportunity to deposit materials for local repairs as well as build larger volumes depending on the type of AM process (e.g. PBF vs. DED). In particular, the availability of certain Directed Energy Deposition (DED) additive manufacturing wire-fed approaches (e.g. Sciaky, Laser Hot Wire (LHW)) can provide build rates of 15-20 lbs./hour. This work will conduct a systematic study of LHW-processed 316L in a variety of build conditions relevant to a number of naval applications where wrought material is typically used, requires repair, or is being considered for use. LHW processing will be used to prepare both bulk and thin-wall deposits of different thickness in order to determine the effects of changes in LHW parameters on the resulting microstructure (grain size, carbide precipitation/sensitization) and properties (hardness, tension, toughness, fatigue, corrosion/SCC resistance). Test specimens will be excised from the bulk samples in order to provide a direct comparison to thin-wall samples deposited to the same thickness but experiencing different thermal conditions. The extensive experience and existing collaborations of the PI in these areas provides an excellent background to ensure rapid progress on these novel AM processing approaches. The project will support a graduate student, the PI, and laboratory costs to examine the microstructure and mechanical properties/SCC resistance of 316L produced via the LHW AM technique, with comparisons to the behavior of laser powder bed fusion-processed 316L being conducted in other ONR sponsored work.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Mar 15, 2021
- Source ID
- N000142112090
Entities
People
- John J. Lewandowski
Organizations
- Case Western Reserve University
- Office of Naval Research
- United States Navy