Enhanced Fatigue Strength of Commercially Pure Ti Processed by Rotary Swaging
Fully reversed bending fatigue tests were performed on polished hour-glass specimens of commercially pure titanium grade 1 with three different grain sizes, that were produced by severe plastic deformation (rotary swaging) and subheat treatments, in order to examine the effect of grain size on fatig...
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| Format: | Article |
| Language: | English |
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Wiley
2015-01-01
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| Series: | Advances in Materials Science and Engineering |
| Online Access: | http://dx.doi.org/10.1155/2015/301837 |
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| author | Hasan ALkhazraji Ehab El-Danaf Manfred Wollmann Lothar Wagner |
| author_facet | Hasan ALkhazraji Ehab El-Danaf Manfred Wollmann Lothar Wagner |
| author_sort | Hasan ALkhazraji |
| collection | DOAJ |
| description | Fully reversed bending fatigue tests were performed on polished hour-glass specimens of commercially pure titanium grade 1 with three different grain sizes, that were produced by severe plastic deformation (rotary swaging) and subheat treatments, in order to examine the effect of grain size on fatigue. An improvement in fatigue strength was observed, as the polycrystal grain size was refined. The endurance limit stress was shown to depend on the inverse square root of the grain size as described empirically by a type of Hall-Petch relation. The effect of refining grain size on fatigue crack growth is to increase the number of microstructural barriers to the advancing crack and to reduce the slip length ahead of the crack tip, and thereby lower the crack growth rate. It was found that postdeformation annealing above recrystallization temperature could additionally enhance the work-hardening capability and the ductility of the swaged material, which led to a marked reduction in the fatigue notch sensitivity. At the same time, this reduction was accompanied with a pronounced loss in strength. The high cycle fatigue performance was discussed in detail based on microstructure and mechanical properties. |
| format | Article |
| id | doaj-art-f94da88c393e40b3abb2cc412167d914 |
| institution | Kabale University |
| issn | 1687-8434 1687-8442 |
| language | English |
| publishDate | 2015-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Materials Science and Engineering |
| spelling | doaj-art-f94da88c393e40b3abb2cc412167d9142025-02-03T01:11:33ZengWileyAdvances in Materials Science and Engineering1687-84341687-84422015-01-01201510.1155/2015/301837301837Enhanced Fatigue Strength of Commercially Pure Ti Processed by Rotary SwagingHasan ALkhazraji0Ehab El-Danaf1Manfred Wollmann2Lothar Wagner3Institute of Materials Science and Engineering, Clausthal University of Technology, 38678 Clausthal-Zellerfeld, GermanyMechanical Engineering Department, College of Engineering, King Saud University, P.O. Box 800, Riyadh 11421, Saudi ArabiaInstitute of Materials Science and Engineering, Clausthal University of Technology, 38678 Clausthal-Zellerfeld, GermanyInstitute of Materials Science and Engineering, Clausthal University of Technology, 38678 Clausthal-Zellerfeld, GermanyFully reversed bending fatigue tests were performed on polished hour-glass specimens of commercially pure titanium grade 1 with three different grain sizes, that were produced by severe plastic deformation (rotary swaging) and subheat treatments, in order to examine the effect of grain size on fatigue. An improvement in fatigue strength was observed, as the polycrystal grain size was refined. The endurance limit stress was shown to depend on the inverse square root of the grain size as described empirically by a type of Hall-Petch relation. The effect of refining grain size on fatigue crack growth is to increase the number of microstructural barriers to the advancing crack and to reduce the slip length ahead of the crack tip, and thereby lower the crack growth rate. It was found that postdeformation annealing above recrystallization temperature could additionally enhance the work-hardening capability and the ductility of the swaged material, which led to a marked reduction in the fatigue notch sensitivity. At the same time, this reduction was accompanied with a pronounced loss in strength. The high cycle fatigue performance was discussed in detail based on microstructure and mechanical properties.http://dx.doi.org/10.1155/2015/301837 |
| spellingShingle | Hasan ALkhazraji Ehab El-Danaf Manfred Wollmann Lothar Wagner Enhanced Fatigue Strength of Commercially Pure Ti Processed by Rotary Swaging Advances in Materials Science and Engineering |
| title | Enhanced Fatigue Strength of Commercially Pure Ti Processed by Rotary Swaging |
| title_full | Enhanced Fatigue Strength of Commercially Pure Ti Processed by Rotary Swaging |
| title_fullStr | Enhanced Fatigue Strength of Commercially Pure Ti Processed by Rotary Swaging |
| title_full_unstemmed | Enhanced Fatigue Strength of Commercially Pure Ti Processed by Rotary Swaging |
| title_short | Enhanced Fatigue Strength of Commercially Pure Ti Processed by Rotary Swaging |
| title_sort | enhanced fatigue strength of commercially pure ti processed by rotary swaging |
| url | http://dx.doi.org/10.1155/2015/301837 |
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