Automated instrument for High Throughput Microhardness Testing
Abstract
Carnegie Mellon University proposes to acquire an automated microhardness testing instrument that will enable high throughput survey s of the variation in hardness in materials. With the advent of additive manufacturing and 3D printing, the variations in thermal h istory across parts result in variations in microstructure, which in turn drives variations in properties such as strength. For a c urrent project under the Quality Made program, we have measured variations in hardness across both single beads and stacked beads th at were generated by laser hot wire deposition of Ti-6Al-4V. The hardness variations were found to relate to variations in microstr ucture caused by variable thermal history. In other work on laser powder bed fusion printed alloy 718, we found significant variati ons in hardness with height (from the build plate) and proximity to edges in laser powder bed fusion (LPBF) alloy 718. The system wi ll also support research in the additive manufacturing of maraging steels, low alloy steels, and refractory metals.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Aug 20, 2021
- Source ID
- N000142112780
Entities
People
- Anthony Rollett
Organizations
- Carnegie Mellon University
- Office of Naval Research
- United States Navy