Effect of Fine Particle Peening Using Hydroxyapatite Particles on Rotating Bending Fatigue Properties of <i>β</i>-Type Titanium Alloy
Fine particle peening (FPP) using hydroxyapatite (HAp) shot particles was performed to improve the fatigue strength and form a HAp transfer layer on a beta titanium alloy (Ti–22V–4Al). The surface microstructures of the FPP-treated specimen were characterized using scanning electron microscopy, micr...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2021-05-01
|
| Series: | Applied Sciences |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2076-3417/11/9/4307 |
| _version_ | 1797534744555028480 |
|---|---|
| author | Yuki Nakamura Koichiro Nambu Toshikazu Akahori Toshihiro Shimizu Shoichi Kikuchi |
| author_facet | Yuki Nakamura Koichiro Nambu Toshikazu Akahori Toshihiro Shimizu Shoichi Kikuchi |
| author_sort | Yuki Nakamura |
| collection | DOAJ |
| description | Fine particle peening (FPP) using hydroxyapatite (HAp) shot particles was performed to improve the fatigue strength and form a HAp transfer layer on a beta titanium alloy (Ti–22V–4Al). The surface microstructures of the FPP-treated specimen were characterized using scanning electron microscopy, micro-Vickers hardness testing, energy dispersive X-ray spectrometry, X-ray diffraction, and electron backscattered diffraction. A HAp transfer layer with a thickness of 5.5 μm was formed on the surface of the Ti–22V–4Al specimen by FPP. In addition, the surface hardness of the Ti–22V–4Al was increased, and high compressive residual stress was generated on the specimen surface by FPP. Rotating bending fatigue tests were performed at room temperature in laboratory air over a wide cycle-life region (10<sup>3</sup>–10<sup>9</sup> cycles). In the long cycle-life regime, the fatigue strength at 10<sup>7</sup> cycles of the FPP-treated specimen became higher than that of the untreated specimen. This result is attributed to the formation of a work-hardened layer with high compressive residual stress by FPP. However, the fatigue strength was not improved by FPP in the short cycle-life regime, because fatigue cracks were initiated at surface defects formed during the FPP process. The fatigue fracture mode of the FPP-treated specimens shifted from surface-initiated fracture to subsurface-initiated fracture at a stress amplitude level of 600 MPa. |
| first_indexed | 2024-03-10T11:33:51Z |
| format | Article |
| id | doaj.art-97ab10d4f8244afd8515ca9fd1075205 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T11:33:51Z |
| publishDate | 2021-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-97ab10d4f8244afd8515ca9fd10752052023-11-21T19:01:17ZengMDPI AGApplied Sciences2076-34172021-05-01119430710.3390/app11094307Effect of Fine Particle Peening Using Hydroxyapatite Particles on Rotating Bending Fatigue Properties of <i>β</i>-Type Titanium AlloyYuki Nakamura0Koichiro Nambu1Toshikazu Akahori2Toshihiro Shimizu3Shoichi Kikuchi4Department of Mechanical Engineering, National Institute of Technology, Toyota College, Toyota 471-8525, JapanFaculty of Engineering, Osaka Sangyo University, Daito 574-8530, JapanFaculty of Science and Technology, Meijo University, Nagoya 468-8502, JapanDepartment of Mechanical Engineering, National Institute of Technology, Toyota College, Toyota 471-8525, JapanFaculty of Engineering, Shizuoka University, Hamamatsu 432-8561, JapanFine particle peening (FPP) using hydroxyapatite (HAp) shot particles was performed to improve the fatigue strength and form a HAp transfer layer on a beta titanium alloy (Ti–22V–4Al). The surface microstructures of the FPP-treated specimen were characterized using scanning electron microscopy, micro-Vickers hardness testing, energy dispersive X-ray spectrometry, X-ray diffraction, and electron backscattered diffraction. A HAp transfer layer with a thickness of 5.5 μm was formed on the surface of the Ti–22V–4Al specimen by FPP. In addition, the surface hardness of the Ti–22V–4Al was increased, and high compressive residual stress was generated on the specimen surface by FPP. Rotating bending fatigue tests were performed at room temperature in laboratory air over a wide cycle-life region (10<sup>3</sup>–10<sup>9</sup> cycles). In the long cycle-life regime, the fatigue strength at 10<sup>7</sup> cycles of the FPP-treated specimen became higher than that of the untreated specimen. This result is attributed to the formation of a work-hardened layer with high compressive residual stress by FPP. However, the fatigue strength was not improved by FPP in the short cycle-life regime, because fatigue cracks were initiated at surface defects formed during the FPP process. The fatigue fracture mode of the FPP-treated specimens shifted from surface-initiated fracture to subsurface-initiated fracture at a stress amplitude level of 600 MPa.https://www.mdpi.com/2076-3417/11/9/4307fine particle peeninghydroxyapatitebeta titanium alloyrotating bendingvery high cycle fatigue |
| spellingShingle | Yuki Nakamura Koichiro Nambu Toshikazu Akahori Toshihiro Shimizu Shoichi Kikuchi Effect of Fine Particle Peening Using Hydroxyapatite Particles on Rotating Bending Fatigue Properties of <i>β</i>-Type Titanium Alloy Applied Sciences fine particle peening hydroxyapatite beta titanium alloy rotating bending very high cycle fatigue |
| title | Effect of Fine Particle Peening Using Hydroxyapatite Particles on Rotating Bending Fatigue Properties of <i>β</i>-Type Titanium Alloy |
| title_full | Effect of Fine Particle Peening Using Hydroxyapatite Particles on Rotating Bending Fatigue Properties of <i>β</i>-Type Titanium Alloy |
| title_fullStr | Effect of Fine Particle Peening Using Hydroxyapatite Particles on Rotating Bending Fatigue Properties of <i>β</i>-Type Titanium Alloy |
| title_full_unstemmed | Effect of Fine Particle Peening Using Hydroxyapatite Particles on Rotating Bending Fatigue Properties of <i>β</i>-Type Titanium Alloy |
| title_short | Effect of Fine Particle Peening Using Hydroxyapatite Particles on Rotating Bending Fatigue Properties of <i>β</i>-Type Titanium Alloy |
| title_sort | effect of fine particle peening using hydroxyapatite particles on rotating bending fatigue properties of i β i type titanium alloy |
| topic | fine particle peening hydroxyapatite beta titanium alloy rotating bending very high cycle fatigue |
| url | https://www.mdpi.com/2076-3417/11/9/4307 |
| work_keys_str_mv | AT yukinakamura effectoffineparticlepeeningusinghydroxyapatiteparticlesonrotatingbendingfatiguepropertiesofibitypetitaniumalloy AT koichironambu effectoffineparticlepeeningusinghydroxyapatiteparticlesonrotatingbendingfatiguepropertiesofibitypetitaniumalloy AT toshikazuakahori effectoffineparticlepeeningusinghydroxyapatiteparticlesonrotatingbendingfatiguepropertiesofibitypetitaniumalloy AT toshihiroshimizu effectoffineparticlepeeningusinghydroxyapatiteparticlesonrotatingbendingfatiguepropertiesofibitypetitaniumalloy AT shoichikikuchi effectoffineparticlepeeningusinghydroxyapatiteparticlesonrotatingbendingfatiguepropertiesofibitypetitaniumalloy |