The Low-Cycle Fatigue Behavior, Failure Mechanism and Prediction of SLM Ti-6Al-4V Alloy with Different Heat Treatment Methods
Selective laser melting (SLM) is a promising additive manufacturing (AM) process for high-strength or high-manufacturing-cost metals such as Ti-6Al-4V widely applied in aeronautical industry components with high material waste or complex geometry. However, one of the main challenges of AM parts is t...
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2021-10-01
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| Online Access: | https://www.mdpi.com/1996-1944/14/21/6276 |
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| author | Jiangjing Xi Yun Hu Hui Xing Yuanfei Han Haiying Zhang Jun Jiang Kamran Nikbin |
| author_facet | Jiangjing Xi Yun Hu Hui Xing Yuanfei Han Haiying Zhang Jun Jiang Kamran Nikbin |
| author_sort | Jiangjing Xi |
| collection | DOAJ |
| description | Selective laser melting (SLM) is a promising additive manufacturing (AM) process for high-strength or high-manufacturing-cost metals such as Ti-6Al-4V widely applied in aeronautical industry components with high material waste or complex geometry. However, one of the main challenges of AM parts is the variability in fatigue properties. In this study, standard cyclic fatigue and monotonic tensile testing specimens were fabricated by SLM and subsequently heat treated using the standard heat treatment (HT) or hot isostatic pressing (HIP) methods. All the specimens were post-treated to relieve the residual stress and subsequently machined to the same surface finishing. These specimens were tested in the low-cycle fatigue (LCF) regime. The effects of post-process methods on the failure mechanisms were observed using scanning electron microscopy (SEM) and optical microscopy (OM) characterization methods. While the tensile test results showed that specimens with different post-process treatment methods have similar tensile strength, the LCF test revealed that no significant difference exists between HT and HIP specimens. Based on the results, critical factors influencing the LCF properties are discussed. Furthermore, a microstructure-based multistage fatigue model was employed to predict the LCF life. The results show good agreement with the experiment. |
| first_indexed | 2024-03-10T05:59:02Z |
| format | Article |
| id | doaj.art-b37d8571e8a2406d810464b0bad4ac55 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T05:59:02Z |
| publishDate | 2021-10-01 |
| publisher | MDPI AG |
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| series | Materials |
| spelling | doaj.art-b37d8571e8a2406d810464b0bad4ac552023-11-22T21:09:39ZengMDPI AGMaterials1996-19442021-10-011421627610.3390/ma14216276The Low-Cycle Fatigue Behavior, Failure Mechanism and Prediction of SLM Ti-6Al-4V Alloy with Different Heat Treatment MethodsJiangjing Xi0Yun Hu1Hui Xing2Yuanfei Han3Haiying Zhang4Jun Jiang5Kamran Nikbin6Department of Mechanical Engineering, Imperial College London SW7 2AZ, UKDepartment of Mechanical Engineering, Imperial College London SW7 2AZ, UKDepartment of Mechanical Engineering, Imperial College London SW7 2AZ, UKDepartment of Mechanical Engineering, Imperial College London SW7 2AZ, UKAircraft Strength Research Institute, Xi’an 710065, ChinaDepartment of Mechanical Engineering, Imperial College London SW7 2AZ, UKDepartment of Mechanical Engineering, Imperial College London SW7 2AZ, UKSelective laser melting (SLM) is a promising additive manufacturing (AM) process for high-strength or high-manufacturing-cost metals such as Ti-6Al-4V widely applied in aeronautical industry components with high material waste or complex geometry. However, one of the main challenges of AM parts is the variability in fatigue properties. In this study, standard cyclic fatigue and monotonic tensile testing specimens were fabricated by SLM and subsequently heat treated using the standard heat treatment (HT) or hot isostatic pressing (HIP) methods. All the specimens were post-treated to relieve the residual stress and subsequently machined to the same surface finishing. These specimens were tested in the low-cycle fatigue (LCF) regime. The effects of post-process methods on the failure mechanisms were observed using scanning electron microscopy (SEM) and optical microscopy (OM) characterization methods. While the tensile test results showed that specimens with different post-process treatment methods have similar tensile strength, the LCF test revealed that no significant difference exists between HT and HIP specimens. Based on the results, critical factors influencing the LCF properties are discussed. Furthermore, a microstructure-based multistage fatigue model was employed to predict the LCF life. The results show good agreement with the experiment.https://www.mdpi.com/1996-1944/14/21/6276low-cycle fatiguetitanium alloySLMadditive manufacturingfatigue model |
| spellingShingle | Jiangjing Xi Yun Hu Hui Xing Yuanfei Han Haiying Zhang Jun Jiang Kamran Nikbin The Low-Cycle Fatigue Behavior, Failure Mechanism and Prediction of SLM Ti-6Al-4V Alloy with Different Heat Treatment Methods Materials low-cycle fatigue titanium alloy SLM additive manufacturing fatigue model |
| title | The Low-Cycle Fatigue Behavior, Failure Mechanism and Prediction of SLM Ti-6Al-4V Alloy with Different Heat Treatment Methods |
| title_full | The Low-Cycle Fatigue Behavior, Failure Mechanism and Prediction of SLM Ti-6Al-4V Alloy with Different Heat Treatment Methods |
| title_fullStr | The Low-Cycle Fatigue Behavior, Failure Mechanism and Prediction of SLM Ti-6Al-4V Alloy with Different Heat Treatment Methods |
| title_full_unstemmed | The Low-Cycle Fatigue Behavior, Failure Mechanism and Prediction of SLM Ti-6Al-4V Alloy with Different Heat Treatment Methods |
| title_short | The Low-Cycle Fatigue Behavior, Failure Mechanism and Prediction of SLM Ti-6Al-4V Alloy with Different Heat Treatment Methods |
| title_sort | low cycle fatigue behavior failure mechanism and prediction of slm ti 6al 4v alloy with different heat treatment methods |
| topic | low-cycle fatigue titanium alloy SLM additive manufacturing fatigue model |
| url | https://www.mdpi.com/1996-1944/14/21/6276 |
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