Effects of chromium addition on fatigue crack growth behavior of titanium aluminides

The microstructure and fatigue crack growth behavior of various compositions of Ti-Al based intermatellics, Ti-48Al (at%), and the ternary alloys, Ti- 48Al-2Cr, Ti-48Al-4Cr and Ti-48Al-8Cr (at%) have been studied. The fatigue crack growth tests were performed on center-cracked-tension M(T) specimens...

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Main Author:	Ong, Wei Rex
Format:	Thesis
Language:	English
Published:	2008
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://eprints.utm.my/id/eprint/10064/1/OngWeiRexMFKM2008.pdf
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spelling	my-utm-ep.100642018-07-23T05:37:01Z Effects of chromium addition on fatigue crack growth behavior of titanium aluminides 2008-11 Ong, Wei Rex TJ Mechanical engineering and machinery The microstructure and fatigue crack growth behavior of various compositions of Ti-Al based intermatellics, Ti-48Al (at%), and the ternary alloys, Ti- 48Al-2Cr, Ti-48Al-4Cr and Ti-48Al-8Cr (at%) have been studied. The fatigue crack growth tests were performed on center-cracked-tension M(T) specimens at room temperature in laboratory air, subjected to a constant applied stress range 100MPa with a load ratio of minimum to maximum level, R = 0.1. It was found that the threshold of stress intensity factor range of Ti-48Al, Ti-48Al-2Cr, Ti-48Al-4Cr and Ti-48Al-8Cr are 12.0MPa v m, 9.0MPa v m, 8.0MPa v m and 4.5MPa v m respectively. The threshold of stress intensity factor range decreased with the increasing percentage of chromium added to Ti-48Al. The results also show that Ti- 48Al-2Cr has the highest fatigue crack resistance followed by Ti-48Al, Ti-48Al-4Cr and Ti48Al-8Cr. Field Emission Scanning Electron Microscopy (FESEM) technique was employed to investigate the fractography of each specimen after fatigue crack growth test. Micro-indentation tests results showed increasing hardness value of Ti- 48Al alloys when the chromium content increased. The microstructures of each type of Ti-48Al alloys were examined using optical and Scanning Electron Microscope (SEM). Finer laths of and plates in lamellar structure have been observed when the amount of chromium added in Ti-48Al increased. The effects of microstructure on fatigue crack growth of Ti-48Al alloys are discussed. 2008-11 Thesis http://eprints.utm.my/id/eprint/10064/ http://eprints.utm.my/id/eprint/10064/1/OngWeiRexMFKM2008.pdf application/pdf en public masters Universiti Teknologi Malaysia, Faculty of Mechanical Engineering Faculty of Mechanical Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TJ Mechanical engineering and machinery
spellingShingle	TJ Mechanical engineering and machinery Ong, Wei Rex Effects of chromium addition on fatigue crack growth behavior of titanium aluminides
description	The microstructure and fatigue crack growth behavior of various compositions of Ti-Al based intermatellics, Ti-48Al (at%), and the ternary alloys, Ti- 48Al-2Cr, Ti-48Al-4Cr and Ti-48Al-8Cr (at%) have been studied. The fatigue crack growth tests were performed on center-cracked-tension M(T) specimens at room temperature in laboratory air, subjected to a constant applied stress range 100MPa with a load ratio of minimum to maximum level, R = 0.1. It was found that the threshold of stress intensity factor range of Ti-48Al, Ti-48Al-2Cr, Ti-48Al-4Cr and Ti-48Al-8Cr are 12.0MPa v m, 9.0MPa v m, 8.0MPa v m and 4.5MPa v m respectively. The threshold of stress intensity factor range decreased with the increasing percentage of chromium added to Ti-48Al. The results also show that Ti- 48Al-2Cr has the highest fatigue crack resistance followed by Ti-48Al, Ti-48Al-4Cr and Ti48Al-8Cr. Field Emission Scanning Electron Microscopy (FESEM) technique was employed to investigate the fractography of each specimen after fatigue crack growth test. Micro-indentation tests results showed increasing hardness value of Ti- 48Al alloys when the chromium content increased. The microstructures of each type of Ti-48Al alloys were examined using optical and Scanning Electron Microscope (SEM). Finer laths of and plates in lamellar structure have been observed when the amount of chromium added in Ti-48Al increased. The effects of microstructure on fatigue crack growth of Ti-48Al alloys are discussed.
format	Thesis
qualification_level	Master's degree
author	Ong, Wei Rex
author_facet	Ong, Wei Rex
author_sort	Ong, Wei Rex
title	Effects of chromium addition on fatigue crack growth behavior of titanium aluminides
title_short	Effects of chromium addition on fatigue crack growth behavior of titanium aluminides
title_full	Effects of chromium addition on fatigue crack growth behavior of titanium aluminides
title_fullStr	Effects of chromium addition on fatigue crack growth behavior of titanium aluminides
title_full_unstemmed	Effects of chromium addition on fatigue crack growth behavior of titanium aluminides
title_sort	effects of chromium addition on fatigue crack growth behavior of titanium aluminides
granting_institution	Universiti Teknologi Malaysia, Faculty of Mechanical Engineering
granting_department	Faculty of Mechanical Engineering
publishDate	2008
url	http://eprints.utm.my/id/eprint/10064/1/OngWeiRexMFKM2008.pdf
_version_	1747814792289058816

Effects of chromium addition on fatigue crack growth behavior of titanium aluminides

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