Microscopic simulation of the effect of process parameters by the Marangoni convection on the temperature field of Inconel 718 alloy using selective laser melting

2018 ◽  
Author(s):  
Zhen Liu ◽  
Ziming Kang ◽  
Yang Gao ◽  
Lingshan Li ◽  
Dongyun Zhang ◽  
...  
Keyword(s):  
Temperature Field ◽  
Selective Laser Melting ◽  
Process Parameters ◽  
Inconel 718 ◽  
Marangoni Convection ◽  
Microscopic Simulation ◽  
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.

scholarly journals The Analytical Prediction of Thermal Distribution and Defect Generation of Inconel 718 by Selective Laser Melting

2020 ◽  
Vol 10 (20) ◽  
pp. 7300 ◽  
Author(s):  
Huadong Yang ◽  
Zhen Li ◽  
Siqi Wang
Keyword(s):  
Selective Laser Melting ◽  
Process Parameters ◽  
Analytical Method ◽  
Inconel 718 ◽  
Analytical Prediction ◽  
Generation Process ◽  
Laser Melting ◽  
Internal Defects ◽  
Defect Generation ◽  
Melt Pool

In selective laser melting, the rapid change of the temperature field caused by the rapid movement of the laser causes the instability of the melt pool flow, resulting in a generation of defects, such as lack of fusion, keyholing and balling effect, which greatly affect the performance of parts. In order to fully understand the temperature distribution and defect generation process of selective laser melting (SLM), experimental research, numerical simulation and analytical methods are mainly applied. The analytical method is suitable for the determination of the optimal process parameters because it is simple and consumes fewer resources. In a simulation, the absorptivity of the material is usually regarded as a constant, but experimental studies have shown that absorptivity is related to temperature, laser power, scanning speed, layer thickness and other process parameters. Considering the dynamics of thermal physical properties of Inconel 718, an improved analytical method was proposed and successfully applied to thermal analysis and the prediction of melt pool size. By comparing with the results of finite element simulation, experiment and other analytical solutions, the ease of use and effectiveness of the method are verified. Based on the prediction of the melt pool and the criterion of internal defects, the combination of process parameters that produce internal defects is calculated, which will make it possible to quickly obtain ideal process parameters.

Selective Laser Melting of the Inconel 718 Nickel Superalloy

2014 ◽  
Vol 698 ◽  
pp. 333-338 ◽  
Author(s):  
Vadim Sh. Sufiiarov ◽  
Evgenii V. Borisov ◽  
Igor A. Polozov
Keyword(s):  
Selective Laser Melting ◽  
Process Parameters ◽  
Inconel 718 ◽  
Melting Process ◽  
Nickel Superalloy ◽  
Mechanical Tests ◽  
Laser Melting ◽  
Influence Of Process Parameters ◽  
Inconel 718 Superalloy

The results of the research on selective laser melting process of the Inconel 718 superalloy powder under conditions of additive manufacturing of parts for special purposes are presented. The influence of process parameters on the quality of manufactured parts is shown. Process parameters which allow manufacturing parts with the density close to 100%, are determined. Also, the results of mechanical tests and investigation of microstructure are presented.

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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