Isothermal Solid‐State Transformations of Inconel 718 Alloy Fabricated by Selective Laser Melting

2020 ◽  
pp. 2000982
Author(s):  
Wenpu Huang ◽  
Zemin Wang
Keyword(s):  
Solid State ◽  
Selective Laser Melting ◽  
Inconel 718 ◽  
Laser Melting ◽  
Inconel 718 Alloy

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.

Friction and wear behaviour of Inconel 718 alloy fabricated by selective laser melting after heat treatments

2018 ◽  
Vol 98 (12) ◽  
pp. 547-555 ◽  
Author(s):  
Zhanyong Zhao ◽  
Hongqiao Qu ◽  
Peikang Bai ◽  
Jing Li ◽  
Liyun Wu ◽  
...  
Keyword(s):  
Selective Laser Melting ◽  
Inconel 718 ◽  
Friction And Wear ◽  
Heat Treatments ◽  
Wear Behaviour ◽  
Laser Melting ◽  
Inconel 718 Alloy
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