Systematic Study On Slip Activity and Plastic Strain Accumulation In Wire-Arc Additive Manufactured Nickel-Aluminum-Bronze Alloys During Monotonic and Cyclic Loading
Abstract
Funds are provided to study the structure-property-processing relationships for wire-arc additive manufacturing nickel-aluminum bron ze alloys.Much work remains to develop an understanding of the relationship between structure and mechanical behavior in additivel y manufactured Nickel-Aluminum-Bronze alloys processed via wire arc additive manufacturing. Nickel-Aluminum-Bronze alloys are widely used in many naval applications including ship propellers, underwater fasteners, pumps, and valves. Traditional sand cast Nickel-Al uminum-Bronze alloys tend to have a large amount of waste material, and limited complexity in component geometry due to the limitati ons of the casting processing. As a result, Nickel-Aluminum-Bronze alloys are emerging as a viable alloy for additive manufacturing and therefore provides a new space to establish fundamental relationships between additive manufacturing processing, structure and properties.These relationships enable the design of materials for damage tolerance under extreme structural loading conditions. Thi s class ofmicrostructurally and compositionally complex alloys undergo many solid-state phase transformations that can influence the fatigue life and behavior during service. This understanding provides the US Navy and the Department of Defense on how to qualify a dditive manufactured Nickel-Aluminum-Bronze parts and components by understanding how these additive manufactured microstructures in fluence the fatigue behavior and life as well as the crack growth behavior in both corrosive and non-corrosive environments. The goa l of the proposed work is to develop discover and exploit quantitative relationships between structure and properties of (1) disloca tion interactions with interfaces such as grain boundaries and precipitates during both in-situ and ex-situ loading, (2) using this to informthe mechanisms of strain localization during plastic deformation (3) and using these results to understand fatigue life and crackinitiation and growth behavior by accounting for the correlations between dislocation interactions and strain localization as well as crystallographic orientation. Based upon prior experience, grain boundaries, microstructural deformation bands and inter actions between dislocations will determine the complexity and rate of local failures within the microstructure. This hypothesis wil l serve as the driving force for the proposed project goals outlined above to improve and understand damage of these materials in na val applications. Approved For Public Release.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Aug 20, 2021
- Source ID
- N000142112668
Entities
People
- Aeriel Murphy-leonard
Organizations
- Office of Naval Research
- Ohio State University
- United States Navy