TY - GEN
T1 - The effects of machined workpiece surface integrity on the fatigue life of TC21 titanium alloy
AU - Du, Dongxing
AU - Liu, Daoxin
AU - Sun, Yufeng
AU - Tang, Jingang
AU - Zhang, Xiaohua
PY - 2012
Y1 - 2012
N2 - 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.
AB - 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.
KW - Fatigue life
KW - Longitudinal polishing
KW - Surface integrity
KW - TC21 titanium alloy
UR - http://www.scopus.com/inward/record.url?scp=84860724501&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/AMR.503-504.382
DO - 10.4028/www.scientific.net/AMR.503-504.382
M3 - 会议稿件
AN - SCOPUS:84860724501
SN - 9783037854044
T3 - Advanced Materials Research
SP - 382
EP - 389
BT - Frontiers of Manufacturing Science and Measuring Technology II
T2 - 2012 2nd International Conference on Frontiers of Manufacturing Science and Measuring Technology, ICFMM 2012
Y2 - 12 June 2012 through 13 June 2012
ER -