scholarly journals Influence of processing parameters of selective laser melting on high‐cycle and very‐high‐cycle fatigue behaviour of Ti‐6Al‐4V

2020 ◽  
Vol 44 (1) ◽  
pp. 240-256
Author(s):  
Leiming Du ◽  
Guian Qian ◽  
Liang Zheng ◽  
Youshi Hong
Keyword(s):  
Selective Laser Melting ◽  
High Cycle Fatigue ◽  
Fatigue Behaviour ◽  
Processing Parameters ◽  
Cycle Fatigue ◽  
Laser Melting ◽  
Very High Cycle Fatigue ◽  
Very High

scholarly journals Very-High-Cycle Fatigue Behavior of Inconel 718 Alloy Fabricated by Selective Laser Melting at Elevated Temperature

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 1001
Author(s):  
Zongxian Song ◽  
Wenbin Gao ◽  
Dongpo Wang ◽  
Zhisheng Wu ◽  
Meifang Yan ◽  
...  
Keyword(s):  
Elevated Temperature ◽  
Selective Laser Melting ◽  
Fatigue Resistance ◽  
Inconel 718 ◽  
High Cycle Fatigue ◽  
Cycle Fatigue ◽  
Laser Melting ◽  
Inconel 718 Alloy ◽  
Very High Cycle Fatigue ◽  
Very High

This study investigates the very-high-cycle fatigue (VHCF) behavior at elevated temperature (650 °C) of the Inconel 718 alloy fabricated by selective laser melting (SLM). The results are compared with those of the wrought alloy. Large columnar grain with a cellular structure in the grain interior and Laves/δ phases precipitated along the grain boundaries were exhibited in the SLM alloy, while fine equiaxed grains were present in the wrought alloy. The elevated temperature had a minor effect on the fatigue resistance in the regime below 108 cycles for the SLM alloy but significantly reduced the fatigue strength in the VHCF regime above 108 cycles. Both the SLM and wrought specimens exhibited similar fatigue resistance in the fatigue life regime of fewer than 107–108 cycles at elevated temperature, and the surface initiation mechanism was dominant in both alloys. In a VHCF regime above 107–108 cycles at elevated temperature, the wrought material exhibited slightly better fatigue resistance than the SLM alloy. All fatigue cracks are initiated from the internal defects or the microstructure discontinuities. The precipitation of Laves and δ phases is examined after fatigue tests at high temperatures, and the effect of microstructure on the formation and the propagation of the microstructural small cracks is also discussed.

scholarly journals Influence of defects on the very high cycle fatigue behaviour of forged aeronautic titanium alloy

2014 ◽  
Vol 12 ◽  
pp. 10004
Author(s):  
Alexander Nikitin ◽  
Thierry Palin-Luc ◽  
Andrey Shanyavskiy ◽  
Claude Bathias
Keyword(s):  
Titanium Alloy ◽  
High Cycle Fatigue ◽  
Fatigue Behaviour ◽  
Cycle Fatigue ◽  
Very High Cycle Fatigue ◽  
Very High
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