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Influence of Environment on Fatigue Mechanisms in High-Temperature Titanium Alloy IMI834

Biallas, Gerhard and Essert, Mark and Maier, Hans Jürgen (2005) Influence of Environment on Fatigue Mechanisms in High-Temperature Titanium Alloy IMI834. International Journal of Fatigue, 27 (10-12), pp. 1485-1493.

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Abstract

We report on in-situ fatigue tests performed in an environmental scanning electron microscope on high-temperature titanium alloy IMI 834 in the range from room temperature to 600 °C both in vacuum and water vapor environments. At low and intermediate temperatures (~ 400 °C) cracks were found to initiate at slip bands independent of the actual environment. However, crack initiation in water vapor occurred at a much lower number of cycles. At 600 °C, the environmental effect became even more pronounced as cracks could easily form in an oxygen-enriched brittle subsurface layer. Moreover, fatigue life at this temperature was found to decrease distinctly in the case of cycling in pure water vapor as compared to loading in ambient air.

Document Type:Article
Title:Influence of Environment on Fatigue Mechanisms in High-Temperature Titanium Alloy IMI834
Authors:
AuthorsInstitution or Email of Authors
Biallas, GerhardUNSPECIFIED
Essert, MarkUniversität Paderborn
Maier, Hans JürgenUniversität Paderborn
Date:2005
Journal or Publication Title:International Journal of Fatigue
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:27
Page Range:pp. 1485-1493
Status:Published
Keywords:titanium alloy IMI834, in-situ fatigue, scanning electron microscopy, environmental degradation, damage mechanisms
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Structures & Materials
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Mechanical Testing of Materials
Deposited By: Dr.-Ing. Gerhard Biallas
Deposited On:27 Jan 2006
Last Modified:27 Apr 2009 04:55

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