Determination of Creep Parameters of Ti-6Al-4V with Bimodal and Equiaxed Microstructure

Abstract:

Ti-6Al-4V is the most used of titanium alloy and presents some important properties as metallurgical stability, high specific strength, corrosion and creep resistance [. The aim of this study is to evaluate the creep behavior of Ti-6Al-4V alloy with equiaxed and bimodal microstructures and determine the creep parameters of Ti-6Al-4V in these conditions. It was used a Ti-6Al-4V alloy forged and annealed at 190°C for 6 hours and cooled in air. The material in this condition shows an equiaxed microstructure. For bimodal microstructure, the material was heat-treated at 950°C for 60 minutes and cooled in water until room temperature. After this the material was heat-treated at 600°C for 24 hours and cooled in air until room temperature. Creep tests were performed at 600°C in stress conditions of 125, 250 and 319 MPa at constant load. The alloy with Bimodal microstructure shows higher creep resistance with a longer life time in creep.

• Periodical: Defect and Diffusion Forum (Volumes 326-328)
• Pages: 520-524
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.326-328.520
• Online since: April 2012
• Authors: L.A.N.S. Briguente, Antônio Augusto Couto, Nara Miranda Guimarães, Danieli A.P. Reis, Carlos de Moura Neto, M.J.R. Barboza
• Keywords: Creep, Heat Treatment, Ti6Al4V

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