Fatigue crack propagation behaviour in wire+arc additive manufactured Ti‐6Al‐4V: Effects of microstructure and residual stress

By Jikui Zhang, Xueyuan Wang, S. Paddea, Xiang Zhang. 2016

207 citations recorded by the source corpus.

Abstract Fatigue crack propagation tests of Ti‐6Al‐4V fabricated by the Wire+Arc Additive Manufacturing (WAAM) process are analysed. Crack growth rate and trajectory are examined before and after the crack tip crossing an interface between the WAAM and wrought alloys. The study has focused on the microstructure and residual stress effect. First, the differences in crack growth rate and path between WAAM and wrought alloys are attributed to their different microstructure; the equiaxed wrought alloy has straight crack path, whereas the WAAM lamellar structure causes tortuous crack path resulting in lower crack growth rate. Second, based on measured residual stress profile in the as-built WAAM piece, retained residual stress in the much smaller compact tension specimens and its effect on crack growth rate are calculated by the finite element method. Numerical simulation shows considerable residual stress in the test specimen and the stress magnitude depends on the initial crack location and propagation direction in relation to the WAAM-wrought interface. Residual stress is released immediately if the initial crack is in the wrought substrate; hence it has little effect. In contrast, when crack grows from WAAM to wrought, residual stress is retained resulting in higher stress intensity factor; hence greater crack growth rate.

Subfields: Automotive Engineering, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/e9bf6852e46e74dda98729cb8041e82bed383c9c

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In Automotive Engineering

1. Karan S. Derekar
2. Ana Vafadar
3. Y. Kaynak

In Mechanical Engineering

1. Karan S. Derekar
2. R. R. Rahman Rashid
3. Kishan Zadafiya
4. Tej Patel
5. Ana Vafadar
6. Navneet Khanna
7. Y. Kaynak

Citations in the corpus

• Review on machining of additively manufactured nickel and titanium alloys (2021, background): “Ductility, low density, high specific strength, and biocompatibility, confrontation to fatigue fracture, corrosion, and high-temperature properties of Tie6Ale4V, an a þ b titanium alloy, allow it to be widely used in the aerospace industry in jet engines, turbines, and airframe as a result of its hi”
• A review of wire arc additive manufacturing and advances in wire arc additive manufacturing of aluminium (2018, background): “[68] • Fatigue crack path selection Titanium (Ti–6Al–4V) Zhang et al.”