Accession Number:

ADA071542

Title:

Standardization of Ti-6Al-4V Processing Conditions.

Descriptive Note:

Final technical rept. 15 Jun 75-31 Jul 78,

Corporate Author:

BOEING COMMERCIAL AIRPLANE CO SEATTLE WASH

Personal Author(s):

Report Date:

1978-09-01

Pagination or Media Count:

166.0

Abstract:

The effects of microstructure, composition, and crystallographic texture on the mechanical, fracture, and fatigue properties of Ti-6Al-4V sheet and plate were evaluated. This program was directed toward defining the processing approach for both product forms that provides the best damage-tolerance characteristics for fracture-critical applications. Specifications were written for premium-grade damage-tolerant Ti-6Al-4V sheet and plate defining processing, and mechanical, and fracture property requirements. The sheet and plate material was produced in accordance with the proposed specifications and characterized. Tensile, fracture toughness, stress-corrosion resistance, fatigue, and fatigue crack propagation air and salt water properties were generated. Testing variables incorporated in the fatigue tests included R ratio 0.05, 0.5, and -1, and test orientation L-T and T-L. Variables in fatigue crack propagation tests included environment air and salt water, R ratio 0.05 and 0.5, and frequency 6 and 60 cpm. Material and heat treatment microstructural variables included variations in oxygen content, crystallographic texture, mill annealing covering the extremes in time and temperature ranges allowed per MIL-H-81200, duplex-annealing with air cooling and furnace cooling, and beta-annealing. The results of the tests are presented in tabular and graphical form, for individual specimens and specimen groups. Comparisons to mill-annealed and recrystallization-annealed material are made. The effects of the various material and test variables on the pertinent properties are discussed. Author

Subject Categories:

  • Properties of Metals and Alloys

Distribution Statement:

APPROVED FOR PUBLIC RELEASE