Accession Number : ADA182159

Title :   Processing and Properties of Airframe Materials.

Descriptive Note : Final rept. 1 Jan 83-28 Feb 86,

Corporate Author : ROCKWELL INTERNATIONAL THOUSAND OAKS CA SCIENCE CENTER

Personal Author(s) : Rhodes,C G ; Chestnutt,J C ; Wert,J A ; Ghosh,A K

PDF Url : ADA182159

Report Date : Jun 1987

Pagination or Media Count : 119

Abstract : This report describes the results of a three-year research program to study the relationship between microstructure and processing conditions and the effects of processing conditiins on the performance of structural airframe materials. Part I of the program was an examination of the influence of beta processing methods on the interaction of fatigue cracks with microstructural elements. These beta-phase processing methods were chosen to provide variations in beta-phase volume fraction and continuity, alpha plate size, and alpha colony size in plate and forging material. The microstructures of the beta-processed materials were quantitatively characterized using scanning electron microscopy (SEM) and scanning transmission electron microscopy (STEM). Linear regression analyses revealed that beta phase volume fraction was most influential and colony size least influential on fatigue crack growth rates. Keywords: Metal processing, Titanium, Aluminum, Fatigue, Superplasticity, Void closure power consolidation, Cavitation, Dynamic recrystallization, Dynamic grain growth.

Descriptors :   *PROCESSING, *ALUMINUM ALLOYS, *TITANIUM ALLOYS, *HIGH STRENGTH ALLOYS, *AIRFRAMES, *MICROSTRUCTURE, ALUMINUM, METHODOLOGY, CLOSURES, POWER, DYNAMICS, RECRYSTALLIZATION, CRACK PROPAGATION, FATIGUE(MECHANICS), RATES, FORGING, MATERIALS, PROCESSING, CAVITATION, DYNAMICS, GRAIN GROWTH, CRACKS, LINEAR REGRESSION ANALYSIS, FABRICATION, GRAIN SIZE, NUCLEATION, HYDROSTATIC PRESSURE, HEAT TREATMENT, METALWORKING, ELECTRON MICROSCOPY, SCANNING, TRANSMITTANCE, PLASTIC PROPERTIES, ELECTRONIC SCANNERS, TITANIUM

Subject Categories : Aircraft
      Fabrication Metallurgy
      Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE