Length-Scale-Dependent Micromechanical Modeling for Precipitate Hardening in Inconel 718 Superalloy

2021 ◽  
Vol 315 ◽  
pp. 84-89
Author(s):  
Chang Feng Wan ◽  
Dong Feng Li ◽  
Hai Long Qin ◽  
Ji Zhang ◽  
Zhong Nan Bi
Keyword(s):  
Dislocation Density ◽  
Strain Gradient ◽  
Inconel 718 ◽  
Micromechanical Modeling ◽  
Fe Model ◽  
Gradient Effect ◽  
Fine Mesh ◽  
Geometrically Necessary Dislocation ◽  
In718 Superalloy ◽  
Inconel 718 Superalloy

In this paper, a micromechanical finite element (FE) model has been proposed to investigate the effect of the nanoscale precipitates on the development of microplasticity for Inconel 718 (IN718) superalloy. A strain gradient crystal plasticity formulation has been developed with the considerations of the evolution of statistically stored dislocation density and geometrically necessary dislocation density. The mesh convergence has been examined, showing that sufficiently fine mesh is required in the FE model. The results show that the model with strain gradient effect incorporated shows less peak plastic strain and higher value of dislocation density than the model with no strain gradient effect. The present study indicates that the strain hardening process at the scale of strengthening precipitate is mainly governed by the evolution of geometrically necessary dislocation densities.

Analytical Prediction of Geometrically Necessary Dislocation Density during Plane Strain Microbending

2016 ◽  
Vol 693 ◽  
pp. 734-739 ◽  
Author(s):  
Li Jie Wang ◽  
Brad L. Kinsey ◽  
Sunal Parasiz
Keyword(s):  
Dislocation Density ◽  
Plane Strain ◽  
Analytical Model ◽  
Cross Section ◽  
Strain Gradient ◽  
Analytical Prediction ◽  
Feature Size ◽  
Strain Gradients ◽  
Geometrically Necessary Dislocation ◽  
The Cross

As components with proportional feature and tooling sizes are miniaturized, strain gradients through the cross-section increase. This causes strain gradient hardening as the density of geometrically necessary dislocations increases. This will lead to higher required forces in the process than expected. In this paper, an analytical model to predict the dislocation density increases, and thus strain gradient hardening, during microbending is presented. These results match previous research in terms of the feature size where modest and significant strain gradient hardening was observed.

Study on Ploughing Effect of Cutting Edge Scale Based on Inconel 718

2014 ◽  
Vol 644-650 ◽  
pp. 2522-2525
Author(s):  
Ren Zhuan Feng
Keyword(s):  
Strain Gradient ◽  
Inconel 718 ◽  
Lattice Distortion ◽  
Cutting Edge ◽  
Machined Surface ◽  
Gradient Effect ◽  
The Relationship

Ploughing effect and cutting edge scale in process of inconel 718-cutting have been investigated. The influence of cutting edge increasing the Plowing effect and Lattice distortion, when the relationship between ploughing effect and cutting edge scale have been aggravate in inconel 718-cutting. The results show that the Plowing effect is influenced obviously by cutting edge scale. Ploughing effect is mainly related to flank and machined surface in their resistance to each other’s friction and the Lattice slip. However, it’s inadequate that the explanation of ploughing effect, which only adopts the Strain gradient effect. The new scale should be introduced with Strain gradient effect. The paper illustrate that the formed of chip reflected the ploughing effect with cutting edge scale.

scholarly journals Study of ultrasonic vibration–assisted thread turning of Inconel 718 superalloy

2019 ◽  
Vol 11 (10) ◽  
pp. 168781401988377
Author(s):  
Yu He ◽  
Zhongming Zhou ◽  
Ping Zou ◽  
Xiaogang Gao ◽  
Kornel F Ehmann
Keyword(s):  
Surface Quality ◽  
Ultrasonic Vibration ◽  
Inconel 718 ◽  
Gas Turbines ◽  
Tool Path ◽  
Machining Parameters ◽  
Thread Cutting ◽  
Workpiece Surface ◽  
Inconel 718 Superalloy ◽  
The Relationship

With excellent properties, high-temperature superalloys have become the main application materials for aircraft engines, gas turbines, and many other devices. However, superalloys are typically difficult to machine, especially for the thread cutting. In this article, an ultrasonic vibration–assisted turning system is proposed for thread cutting operations in superalloys. A theoretical analysis of ultrasonic vibration–assisted thread cutting is carried out. An ultrasonic vibration–assisted system was integrated into a standard lathe to demonstrate thread turning in Inconel 718 superalloy. The influence of ultrasonic vibration–assisted machining on workpiece surface quality, chip shape, and tool wear was analyzed. The relationship between machining parameters and ultrasonic vibration–assisted processing performance was also explored. By analyzing the motion relationship between tool path and workpiece surface, the reasons for improved workpiece surface quality by ultrasonic vibration–assisted machining were explained.

Nonlinear surface wave measurements on aged and laser shock surface-treated Inconel 718 superalloy

2021 ◽  
Vol 121 ◽  
pp. 102457
Author(s):  
Vania M. Rodríguez-Herrejón ◽  
Alberto Ruiz ◽  
Carlos Rubio-González ◽  
Víctor H. López-Morelos ◽  
Jin-Yeon Kim ◽  
...  
Keyword(s):  
Surface Wave ◽  
Inconel 718 ◽  
Laser Shock ◽  
Shock Surface ◽  
Wave Measurements ◽  
Inconel 718 Superalloy ◽  
Nonlinear Surface

scholarly journals Microstructure and Corrosion Properties of La2Zr2O7/NiCoAlY Thermal Barrier Coatings Deposited on Inconel 718 Superalloy by Laser Cladding

Coatings ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 101
Author(s):  
Kaijin Huang ◽  
Wei Li ◽  
Kai Pan ◽  
Xin Lin ◽  
Aihua Wang
Keyword(s):  
Corrosion Resistance ◽  
Thermal Barrier Coating ◽  
Laser Cladding ◽  
Inconel 718 ◽  
Electrochemical Techniques ◽  
Thermal Barrier ◽  
Nacl Solution ◽  
Corrosion Performance ◽  
Barrier Coating ◽  
Inconel 718 Superalloy

In order to improve the seawater corrosion resistance of Inconel 718 superalloy, a La2Zr2O7/NiCoCrAlY thermal barrier coating corrosion resistant to 3.5 wt.% NaCl aqueous solution was prepared by laser cladding on Inconel 718 superalloy. X-ray diffraction (XRD), Scanning Electron Microscope (SEM), and electrochemical techniques were used to study the microstructure and the corrosion performance of the coating in 3.5 wt.% NaCl solution. The results show that the thermal barrier coating is mainly composed of primary La2Zr2O7 phase and γ + laves/δ phase eutectic structure. The corrosion potential and corrosion current of the coating in 3.5 wt.% NaCl solution are higher and lower than that of the Inconel 718 substrate, respectively, indicating that the corrosion performance of the coating is better than that of the Inconel 718 substrate. The presence of La2Zr2O7 phase in the thermal barrier coating is the main reason for its corrosion resistance to 3.5 wt.% NaCl solution.

Sign in / Sign up

Export Citation Format

Share Document