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10.3390/ma14216276
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Article

The Low-Cycle Fatigue Behavior, Failure Mechanism and Prediction of SLM Ti-6Al-4V Alloy with Different Heat Treatment Methods

by
Jiangjing Xi
1,2,
Yun Hu
1,3,*,
Hui Xing
1,4,
Yuanfei Han
1,4,
Haiying Zhang
2,
Jun Jiang
1,* and
Kamran Nikbin
1,*
1
Department of Mechanical Engineering, Imperial College London SW7 2AZ, UK
2
Aircraft Strength Research Institute, Xi’an 710065, China
3
School of Mechatronics Engineering, Nanchang University, Nanchang 330031, China
4
School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
*
Authors to whom correspondence should be addressed.
Materials 2021, 14(21), 6276; https://doi.org/10.3390/ma14216276
Submission received: 27 August 2021 / Revised: 14 October 2021 / Accepted: 15 October 2021 / Published: 21 October 2021
(This article belongs to the Topic Structure and Properties Modification in Additive Manufacturing)
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Abstract

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.
Keywords: low-cycle fatigue; titanium alloy; SLM; additive manufacturing; fatigue model low-cycle fatigue; titanium alloy; SLM; additive manufacturing; fatigue model

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MDPI and ACS Style

Xi, J.; Hu, Y.; Xing, H.; Han, Y.; Zhang, H.; Jiang, J.; Nikbin, K. The Low-Cycle Fatigue Behavior, Failure Mechanism and Prediction of SLM Ti-6Al-4V Alloy with Different Heat Treatment Methods. Materials 2021, 14, 6276. https://doi.org/10.3390/ma14216276

AMA Style

Xi J, Hu Y, Xing H, Han Y, Zhang H, Jiang J, Nikbin K. The Low-Cycle Fatigue Behavior, Failure Mechanism and Prediction of SLM Ti-6Al-4V Alloy with Different Heat Treatment Methods. Materials. 2021; 14(21):6276. https://doi.org/10.3390/ma14216276

Chicago/Turabian Style

Xi, Jiangjing, Yun Hu, Hui Xing, Yuanfei Han, Haiying Zhang, Jun Jiang, and Kamran Nikbin. 2021. "The Low-Cycle Fatigue Behavior, Failure Mechanism and Prediction of SLM Ti-6Al-4V Alloy with Different Heat Treatment Methods" Materials 14, no. 21: 6276. https://doi.org/10.3390/ma14216276

APA Style

Xi, J., Hu, Y., Xing, H., Han, Y., Zhang, H., Jiang, J., & Nikbin, K. (2021). The Low-Cycle Fatigue Behavior, Failure Mechanism and Prediction of SLM Ti-6Al-4V Alloy with Different Heat Treatment Methods. Materials, 14(21), 6276. https://doi.org/10.3390/ma14216276

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