Effects of Surface Modifications on Rotating Bending Fatigue of Ni-Al Bronze Alloy
Surface modifications, including laser surface melting (LSM) and micro-shot peening (MSP), were applied to improve the fatigue performance of the Ni-Al bronze (NAB) alloy. LSM could homogenize the NAB into a uniform microstructure with refined columnar grains in the laser-melted zone but introduced...
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2024-12-01
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| author | Guan-Xun Lu Tai-Cheng Chen Ren-Kae Shiue Leu-Wen Tsay |
| author_facet | Guan-Xun Lu Tai-Cheng Chen Ren-Kae Shiue Leu-Wen Tsay |
| author_sort | Guan-Xun Lu |
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| description | Surface modifications, including laser surface melting (LSM) and micro-shot peening (MSP), were applied to improve the fatigue performance of the Ni-Al bronze (NAB) alloy. LSM could homogenize the NAB into a uniform microstructure with refined columnar grains in the laser-melted zone but introduced residual tensile stress (RTS). The bombardment and generated heat induced by MSP could not entirely remove the granular κ<sub>II</sub> precipitates and lamellar κ<sub>III</sub> phase in the peened zone of the shot-peened sample (NSP sample) but introduced residual compressive stress (RCS) into the NSP sample under the peening intensity of this work. The results of fatigue tests revealed that the LSM sample had the poorest fatigue performance, but the NSP sample showed the best fatigue performance among the tested samples. The fatigue limit of the NAB alloy was about 325 MPa; meanwhile, the fatigue performance of the LSP (LSM + MSP) sample was equivalent to or a little better than that of the NAB alloy (NBM sample). The RTS and aligned columnar grains accounted for the degraded fatigue resistance of the LSM sample. By contrast, the high RCS and the refined structure were responsible for the improved fatigue strength/life of the NSP sample relative to that of the other samples. The fatigue limit of the NSP sample was as high as 450 MPa. However, the increase in fatigue strength of the NSP sample occurred in service life regions above 3 × 10<sup>5</sup> cycles. |
| format | Article |
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| institution | Kabale University |
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| language | English |
| publishDate | 2024-12-01 |
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| spelling | doaj-art-16ff4af57c494cbd8f8a567cfabc3dae2025-01-24T13:41:25ZengMDPI AGMetals2075-47012024-12-011511910.3390/met15010019Effects of Surface Modifications on Rotating Bending Fatigue of Ni-Al Bronze AlloyGuan-Xun Lu0Tai-Cheng Chen1Ren-Kae Shiue2Leu-Wen Tsay3Department of Optoelectronics and Materials Technology, National Taiwan Ocean University, Keelung 20224, TaiwanDepartment of Material Research, National Atomic Research Institute, Taoyuan 32546, TaiwanDepartment of Materials Science and Engineering, National Taiwan University, Taipei 10617, TaiwanDepartment of Optoelectronics and Materials Technology, National Taiwan Ocean University, Keelung 20224, TaiwanSurface modifications, including laser surface melting (LSM) and micro-shot peening (MSP), were applied to improve the fatigue performance of the Ni-Al bronze (NAB) alloy. LSM could homogenize the NAB into a uniform microstructure with refined columnar grains in the laser-melted zone but introduced residual tensile stress (RTS). The bombardment and generated heat induced by MSP could not entirely remove the granular κ<sub>II</sub> precipitates and lamellar κ<sub>III</sub> phase in the peened zone of the shot-peened sample (NSP sample) but introduced residual compressive stress (RCS) into the NSP sample under the peening intensity of this work. The results of fatigue tests revealed that the LSM sample had the poorest fatigue performance, but the NSP sample showed the best fatigue performance among the tested samples. The fatigue limit of the NAB alloy was about 325 MPa; meanwhile, the fatigue performance of the LSP (LSM + MSP) sample was equivalent to or a little better than that of the NAB alloy (NBM sample). The RTS and aligned columnar grains accounted for the degraded fatigue resistance of the LSM sample. By contrast, the high RCS and the refined structure were responsible for the improved fatigue strength/life of the NSP sample relative to that of the other samples. The fatigue limit of the NSP sample was as high as 450 MPa. However, the increase in fatigue strength of the NSP sample occurred in service life regions above 3 × 10<sup>5</sup> cycles.https://www.mdpi.com/2075-4701/15/1/19Ni-Al bronzelaser surface meltingmicro-shot peeningrotating bending fatigueresidual stress |
| spellingShingle | Guan-Xun Lu Tai-Cheng Chen Ren-Kae Shiue Leu-Wen Tsay Effects of Surface Modifications on Rotating Bending Fatigue of Ni-Al Bronze Alloy Metals Ni-Al bronze laser surface melting micro-shot peening rotating bending fatigue residual stress |
| title | Effects of Surface Modifications on Rotating Bending Fatigue of Ni-Al Bronze Alloy |
| title_full | Effects of Surface Modifications on Rotating Bending Fatigue of Ni-Al Bronze Alloy |
| title_fullStr | Effects of Surface Modifications on Rotating Bending Fatigue of Ni-Al Bronze Alloy |
| title_full_unstemmed | Effects of Surface Modifications on Rotating Bending Fatigue of Ni-Al Bronze Alloy |
| title_short | Effects of Surface Modifications on Rotating Bending Fatigue of Ni-Al Bronze Alloy |
| title_sort | effects of surface modifications on rotating bending fatigue of ni al bronze alloy |
| topic | Ni-Al bronze laser surface melting micro-shot peening rotating bending fatigue residual stress |
| url | https://www.mdpi.com/2075-4701/15/1/19 |
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