Researchers published in Nature:Scientific Reports for investigation on joining titanium alloy and stainless steel by Laser 3D Printing

"Investigation on Ti6Al4V-V-Cr-Fe-SS316 Multi-layers Metallic Structure Fabricated by Laser 3D Printing," a paper researchers, Wei Li, Frank Liou, Joseph Newkirk, Karen Taminger, and William Seufzer authored has been selected for online publication in Nature: Scientific Reports in August 2017. 

Additive manufacturing enables digital materials so that the design and integration of various materials in one structure is possible. However, some materials are very difficult to be work together. Joining titanium alloy and stainless steel is a good example. Direct fusion joining of Ti6Al4V to SS316 can cause brittle Ti-Fe intermetallics which compromise join bonds’ mechanical properties. This research employed metal deposition process to explore the possibility of integrating Ti6Al4V and SS316 as a multi-metallic structure. Experimental cases were performed for comparison to evaluate the novel effect. A multi-metallic structure has been successfully fabricated via this metal deposition process. Microstructure characterization and composition distribution were analyzed via scanning electron microscope (SEM) and energy dispersive spectrometry (EDS). The x-ray diffraction(XRD) tests demonstrated the intermetallics were effectively avoided. Vickers hardness number (VHN) showed no significant hard brittle phases in the sample. This research shows the possibility of using additive manufacturing technology to integrate materials that are normally impossible to work together.

Mr. Wei Li is a Ph.D candidate of mechanical engineering department at Missouri S&T. His research interests include fabrication of customized materials (functional graded material, elemental powder, etc.) with metal deposition process, investigation of multi-component powder mixture’s flow behavior, modeling analysis of laser 3D printing process.

Dr. Frank Liou is the Michael and Joyce Bytnar Professor of Mechanical Engineering Department, Missouri S&T. Dr. Liou’s research is mainly in additive manufacturing (AM), including hybrid additive and subtractive processes, path planning, multiscale multiphysics process modeling, and AM process monitoring and control. Dr. Liou is a Fellow of ASME.

Dr. Joseph Newkirk is a Professor of Materials Science & Engineering, Missouri S&T. His research has been focused on materials processing and recently on additive manufacturing. He is well known for his work in the area of powder metallurgy and is becoming recognized as a leader in the behavior of metallic materials fabricated by additive manufacturing.

Karen Taminger is a Materials Research Engineer and Tech Lead for Electron Beam Freeform Fabrication (EBF3) metal additive manufacturing process at NASA Langley Research Center. She also serves as agency technical lead for Structural Efficiency for the Fundamental Aeronautics (Subsonic) Fixed Wing project

William Seufzer is a Computational Engineer in the Advanced Materials and Processes Branch, Research Directorate, NASA Langley, in Hampton VA.  His current work includes Genetic Algorithm related research in support of the Autonomous Operations Planner for NextGen Air Traffic control.