Accession Number:

ADA031357

Title:

Improvement of Helicopter Forgings by Controlled Solidification and Thermal-Mechanical Treatments.

Descriptive Note:

Final rept. Mar 74-Mar 76,

Corporate Author:

BOEING VERTOL CO PHILADELPHIA PA

Personal Author(s):

Report Date:

1976-10-01

Pagination or Media Count:

266.0

Abstract:

A four-task program was conducted to provide information for the development of industrial techniques for producing improved aluminum forgings. These techniques, involving intermediate thermal-mechanical treatment ITMT of ingot, were evaluated on the basis of microstructure, mechanical properties, fracture and fatigue properties, and resistance to stress corrosion. The results showed that ITMT forgings have equivalent tensile properties and stress corrosion resistance and at least 20 better fracture toughness and fatigue properties when compared to conventional 7075-T73 forgings. Author

Subject Categories:

  • Helicopters
  • Properties of Metals and Alloys
  • Fabrication Metallurgy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE