Cast Development for Aging Aircraft.
Abstract
High quality investment castings have been increasingly selected for use on commercial and military aircraft due to their cost and weight benefits. Thin wall titanium and aluminum cast components have replaced many heavy complicate and manufacturing intensive, multipiece parts. Thick investment cast parts weighing up to 400 lb have become a reality. Also, welded titanium castings are being implemented on newly developed military aircraft. However, several issues critical for the wide implementation of this casting technology have yet to be adequately addressed: inspection of thick sections, effect of defects (porosity, shell inclusions, especially the halo zone) on the fatigue performance, heat treatment, lack of specifications, and applications of the casting factor. Another major casting implementation issue pertinent to our aging aircraft systems is the requirement for qualification testing. There are no clear guidelines as to whether or not costly and lengthy qualification tests are required for the substitution for eve part. This paper will discuss these issues and the efforts to overcome the problems.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 25, 1999
- Accession Number
- ADA368597
Entities
People
- Charles S. Lei
- Dui W. Lee
- Jeffrey Waldman
- William E. Frazier
Organizations
- Naval Air Warfare Center