Durability and Damage Tolerance of Aluminum Castings
Abstract
A durability and damage tolerance (DADT) data base for aluminum casting alloys D357-T6 and B201-T7 was developed and the applicability of ultrasonic and low frequency eddy-current NDI methods to castings was assessed. Relationships among composition, heat treatment, solidification rate, microstructure, and mechanical properties were investigated using multiple regression analyses. Strontium (silicon modifier) and silver had the most significant impact on the properties of D357-T6 and B201-T7 respectively. Constant amplitude fatigue data were used to calculate an equivalent initial flaw size for both alloys. Spectrum fatigue results for D357-T6 were used to assess the applicability of current military DADT specifications to aluminum castings. The effect of intentionally-added defects (D357-T6) and nonoptimum microstructure (D357-T6 and B201-T7) on mechanical properties was determined. Four large, complex aerospace castings were produced and tested to confirm that the property data base, which was obtained for cast plates, is applicable to aircraft applications. A D357 specification for durability and damage tolerance applications was submitted to the Society of Automotive Engineers.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1991
- Accession Number
- ADA245237
Entities
People
- M. W. Ozelton
- P. G. Porter
- S. J. Mocarski