The application of hot isostatic pressing of Ni-base superalloy components for critical aerospace applications
Abstract
There has been a directed effort aimed at developing and employing near net-shape processingtechniques that reduce the cost of production, as well as increase the performance, of criticalaerospace components. One such near net-shape technique is hot isostatic pressing (HIP) wherepre-alloyed powders are consolidated in a shaped tool. The advantages of the technique involve itsnear net-shape capability, very efficient use of material (the buy-to-fly ratio is close to unity),uniformity of microstructure across the component, a lack of prominent textures, very limitedextent of residual stresses and an absence of porosity. However, there are a number ofdisadvantages that have limited the general application of this technique. Among these limitationsare the expense of the shaped tooling required, the presence of defects in the consolidatedmaterials, and a lack of a predictive capability regarding evolution of microstructure, required toavoid expensive trial and error methods in an attempt to optimize the properties of the processedcomponent. This proposal, focusing on Ni-base superalloys, aims to provide solutions to theseproblems, such that more general applicability of the HIP process may be realized. These includethe use of additive manufacturing to produce “in-situ” tooling, a novel approach to the reductionof defects, and the development of sophisticated computational tools to permit prediction of theevolution of microstructure during processing and subsequent heat-treatments. Additionally, anadvantage of HIP that has not been exploited is the ability to process hybrid microstructure anddual-alloy materials, permitting local enhancement of properties of components, and thispossibility will be explored in the proposed program.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Apr 09, 2018
- Source ID
- FA95501810123
Entities
People
- H.L. Fraser
Organizations
- Air Force Office of Scientific Research
- Ohio State University
- United States Air Force