Fundamental Mechanistic Investigations of Additively Manufactured Multi-Phase Hybrid Materials
Abstract
In recent years, additive manufacturing has gained increasing interest to produce novel near-net shape components. In contrast to conventional manufacturing techniques, like casting, we have determined that tailoring of microstructures along the build direction can achieve desired room and elevated temperature mechanical and wear properties for different alloys in the Ni-Al-Cr-C system. Specifically, we have explored laser additive manufacturing of novel hybrid materials with microstructures composed of solid solution strengthening and precipitation strengthening of a /dendritic matrices, along with a distribution of reinforcing in situ formed hard ceramic (chromium carbides) and solid lubricant (graphite) phases. Such compositional modification of chromium and carbon were determined to drastically affect the corresponding phase morphology and properties, as determined by experimental and solution thermodynamic simulations. In addition, these laser deposited Ni-Al-Cr-C alloys could potentially be used for high temperature bearing houses that still require the need for high temperature solid lubrication at temperatures >400C, where current M50steels exhibit oxidation issues leading to loss in rolling contact fatigue resistance. Mechanistic studies using surface and subsurface scanning and transmission electron microscopies in the wear surfaces revealed a combination of increased hardness/load-bearing and formation of tribochemical protective oxide glaze layers that were responsible for mitigating room and elevated temperature wear.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 27, 2022
- Accession Number
- AD1230442
Entities
People
- Thomas Scharf
Organizations
- University of North Texas