High Cycle Fatigue (HCF) Performance of Ti-6Al-4V Alloy Processed by Selective Laser Melting
By E. Wycisk, C. Emmelmann, S. Siddique, F. Walther. 2013
187 citations recorded by the source corpus.
Selective laser melting (SLM) is a relatively new additive manufacturing (AM) technology which uses laser energy for manufacturing in a layered pattern. The unique manufacturing process of SLM offers a competitive advantage in case of very complex and highly customized parts having quasi-static mechanical properties comparable to those of wrought materials. However, it is not currently being harnessed in dynamic applications due to the lack of reliable fatigue data. The manufacturing process shows competitive advantages particularly in the aerospace and medical industry in which Ti-6Al-4V is commonly used, especially for high performance and dynamic applications. Therefore, in this exploratory research, high cycle fatigue (HCF) tests were performed for as-built, polished and shot-peened samples to investigate the capability of SLM for these applications. As-built samples showed a drastic decrement of fatigue limit due to poor surface quality (Ra ≈ 13 µm) obtained from the SLM process. Polishing improved the fatigue limit to more than 500 MPa, the typical value for base material. The effect of shot-peening proved to be antithetical to the expected results. In this context, fractographic analysis showed that very small remnant porosity (less than 0.4%) played a critical role in fatigue performance.
Subfields: Automotive Engineering, Mechanical Engineering
View Paper: https://www.semanticscholar.org/paper/118fdd908b3cd3b28214dd4d4d81876705d53e9b
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Citations in the corpus
- A review of the as-built SLM Ti-6Al-4V mechanical properties towards achieving fatigue resistant designs (2018, background): “Eric 1 [60] Cylindrical coupon at 45◦ to build plate α ′ martensite 0.”
- Additive manufacturing of Ti6Al4V alloy: A review (2019, unknown): “For AM Ti6Al4V, the as-built parts without surface machining only exhibit a fatigue performance about 40–50% of that after machining [101,159,170,171].”
- Measurement Science Needs for Real-time Control of Additive Manufacturing Powder Bed Fusion Processes (2015, unknown): “CPG2Ti [42], [83], [93], [108], [112]–[116].”
- A comparison of fatigue strength sensitivity to defects for materials manufactured by AM or traditional processes (2017, background): “The influences of heat treatment [68,71,76] and HIP [8,76,77] are also analyzed, as are those of shot-peening [10].”