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The Effects of Machined Workpiece Surface Integrity on the Fatigue Life of TC21 Titanium Alloy

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Abstract:

In this paper, the influence of different machining methods (including rough turning, finish turning, and longitudinal polishing after finish turning) on rotating bending fatigue properties of TC21 which belonged to a new ultra high strength titanium alloy was studied. The influence of machining methods on surface integrity of TC21 titanium alloy was measured by using surface profile measurement, scanning electron microscopy, metallography microscope, micro-hardness instrument and X-ray diffraction residual stress analyzer. And fatigue fractography of specimens was further investigated. Then the mechanism of fatigue resistance which was affected by machining surface integrity was discussed. The results indicated that the fatigue life of finish turning and longitudinal polishing after finish turning was increased 3.96 times and 17.34 times compared with rough turning, respectively. The machining surface integrity had important influence on fatigue property of TC21 titanium alloy, which caused by the differences of surface roughness and texture as the dominant factors, and then the variation in surface micro-hardness, metallographic microstructure and the surface residual stress were not the main factors on three above-mentioned machining methods. By using longitudinal polishing after finish turning processing method for preparation of TC21 titanium alloy parts could ensure good surface integrity and excellent fatigue performance.

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Periodical:

Advanced Materials Research (Volumes 503-504)

Pages:

382-389

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.503-504.382

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Online since:

April 2012

Authors:

Dong Xing Du, Dao Xin Liu, Yu Feng Sun, Jin Gang Tang, Xiao Hua Zhang

Keywords:

Fatigue Life, Longitudinal Polishing, Surface Integrity, TC21 Titanium Alloy

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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