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Texture analysis of a Ti-6Al-4V forged alloy after different heat treatment conditions


EMSL Project ID
1943

Abstract

University of Idaho - Institute for Materials and Advanced Processes conducts a research program aimed at improving understanding of the evolution of the microstructure of Ti-6Al-4V titanium alloy during heat treatment after forging. This is a subcontract work of the University of Idaho for Concurrent Technologies Corporation that has a project management responsibility for a Navy MANTECH project. The University of Idaho has all equipment necessary for microstructural characterization, such as OM, SEM, TEM/EDS and XRD, but not for texture analysis. Our XRD has not equipped with a texture analysis setup, and the EMSL/PNNL help would be much appreciated. Actually, Drs. D.R. Baer and D.E. McCready have already helped us with texture analysis of the Ti-6Al-4V alloy forging. Three pole figures (002), (100) and (110) of the HCP phase were successfully obtained from the as-forged sample showing advancements of EMSL in texture analysis. It is known that the morphology, content, and size distribution of alpha and beta phases and crystallographic texture are the primary determinants of the mechanical properties of titanium alloy parts. Hence, an understanding of the microstructural development in this alloy during forging and heat treatment is seen as an essential step in engineering mechanical properties of titanium alloy components. Crystallographic texture affects much the mechanical properties. In titanium alloys the texture control is particularly important because of the HCP alpha phase anisotropy. A study of the effect of heat treatment and subsequent cooling conditions on texture development in the Ti-6Al-4V alloy forging and correlation of the texture with microstructure and mechanical properties is one of our tasks. Within this work, the crystallographic texture of 8 samples heat treated in the upper and middle parts of the (alpha+beta) phase range and subsequently cooled with the rates of 50ºC/min, 100ºC/min, 300ºC/min and 1000ºC/min will be identified.

Project Details

Project type
Exploratory Research
Start Date
2000-03-21
End Date
2002-03-31
Status
Closed

Team

Principal Investigator

Oleg Senkov
Institution
University of Idaho