Effects of specimen size and hot isostatic pressing on high-cycle and very-high-cycle fatigue of additively manufactured Ti6Al4V
This study investigates the effects of specimen size and hot isostatic pressing (HIP) on the high-cycle fatigue (HCF) and very-high-cycle fatigue (VHCF) performance of additively manufactured (AMed) Ti6Al4V. Three groups of specimens were designed and fabricated. Two of them had control volumes of 5...
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| Language: | English |
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Elsevier
2025-09-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785425020071 |
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| author | Yu Xia Xiangnan Pan Aiguo Zhao Youshi Hong |
| author_facet | Yu Xia Xiangnan Pan Aiguo Zhao Youshi Hong |
| author_sort | Yu Xia |
| collection | DOAJ |
| description | This study investigates the effects of specimen size and hot isostatic pressing (HIP) on the high-cycle fatigue (HCF) and very-high-cycle fatigue (VHCF) performance of additively manufactured (AMed) Ti6Al4V. Three groups of specimens were designed and fabricated. Two of them had control volumes of 50 mm3 and 8294 mm3, respectively, and the third group consisted of 50 mm3 subjected to HIP treatment. The results indicate that fatigue performance demonstrates a notable size effect as the control volume increases, with smaller specimens exhibiting higher fatigue strength. However, this size effect gradually diminishes with increasing failure cycles. For the HIP-treated specimens, crack initiation is no longer dominated by void defects but occurs due to α-phase grain cleavage. For the two groups without HIP treatment, a statistical analysis of crack initiation defects reveals that, in both HCF and VHCF states, the fatigue cracks in larger specimens always originate from internal defects. The average defect sizes are 109 μm for large sized specimen group and 54 μm for small sized specimen group. By using the probabilistic control volume model, the fatigue strength of large specimens was predicted based on the fatigue data of small specimens, and the prediction was consistent with the experimental data. |
| format | Article |
| id | doaj-art-54dba9acccb44d07824c8d96199c7a63 |
| institution | Kabale University |
| issn | 2238-7854 |
| language | English |
| publishDate | 2025-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj-art-54dba9acccb44d07824c8d96199c7a632025-08-20T04:00:55ZengElsevierJournal of Materials Research and Technology2238-78542025-09-01381947195910.1016/j.jmrt.2025.08.054Effects of specimen size and hot isostatic pressing on high-cycle and very-high-cycle fatigue of additively manufactured Ti6Al4VYu Xia0Xiangnan Pan1Aiguo Zhao2Youshi Hong3State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing, 100190, China; College of Civil Engineering, Nanjing Tech University, Nanjing, 211816, ChinaState Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing, 100190, ChinaCollege of Civil Engineering, Nanjing Tech University, Nanjing, 211816, ChinaState Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing, 100190, China; Corresponding author.This study investigates the effects of specimen size and hot isostatic pressing (HIP) on the high-cycle fatigue (HCF) and very-high-cycle fatigue (VHCF) performance of additively manufactured (AMed) Ti6Al4V. Three groups of specimens were designed and fabricated. Two of them had control volumes of 50 mm3 and 8294 mm3, respectively, and the third group consisted of 50 mm3 subjected to HIP treatment. The results indicate that fatigue performance demonstrates a notable size effect as the control volume increases, with smaller specimens exhibiting higher fatigue strength. However, this size effect gradually diminishes with increasing failure cycles. For the HIP-treated specimens, crack initiation is no longer dominated by void defects but occurs due to α-phase grain cleavage. For the two groups without HIP treatment, a statistical analysis of crack initiation defects reveals that, in both HCF and VHCF states, the fatigue cracks in larger specimens always originate from internal defects. The average defect sizes are 109 μm for large sized specimen group and 54 μm for small sized specimen group. By using the probabilistic control volume model, the fatigue strength of large specimens was predicted based on the fatigue data of small specimens, and the prediction was consistent with the experimental data.http://www.sciencedirect.com/science/article/pii/S2238785425020071Very-high-cycle fatigueSize effectControl volumeHot isostatic pressingAdditive manufacturingTi6Al4V |
| spellingShingle | Yu Xia Xiangnan Pan Aiguo Zhao Youshi Hong Effects of specimen size and hot isostatic pressing on high-cycle and very-high-cycle fatigue of additively manufactured Ti6Al4V Journal of Materials Research and Technology Very-high-cycle fatigue Size effect Control volume Hot isostatic pressing Additive manufacturing Ti6Al4V |
| title | Effects of specimen size and hot isostatic pressing on high-cycle and very-high-cycle fatigue of additively manufactured Ti6Al4V |
| title_full | Effects of specimen size and hot isostatic pressing on high-cycle and very-high-cycle fatigue of additively manufactured Ti6Al4V |
| title_fullStr | Effects of specimen size and hot isostatic pressing on high-cycle and very-high-cycle fatigue of additively manufactured Ti6Al4V |
| title_full_unstemmed | Effects of specimen size and hot isostatic pressing on high-cycle and very-high-cycle fatigue of additively manufactured Ti6Al4V |
| title_short | Effects of specimen size and hot isostatic pressing on high-cycle and very-high-cycle fatigue of additively manufactured Ti6Al4V |
| title_sort | effects of specimen size and hot isostatic pressing on high cycle and very high cycle fatigue of additively manufactured ti6al4v |
| topic | Very-high-cycle fatigue Size effect Control volume Hot isostatic pressing Additive manufacturing Ti6Al4V |
| url | http://www.sciencedirect.com/science/article/pii/S2238785425020071 |
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