The Analytical Prediction of Thermal Distribution and Defect Generation of Inconel 718 by Selective Laser Melting
Abstract
:1. Introduction
2. Analytical Solution
2.1. Analytical Model
2.2. Absorptivity of IN718
2.3. Material Properties
3. Numerical Simulation (FE)
3.1. Heat Conduction Equation
3.2. Heat Source Model
3.3. Latent Heat Treatment
4. Results Discussion
4.1. The Sensitivity of Thermal Prediction to Absorptivity
4.2. The Dimension of Melt Pool from Experiment, FE and Analytical Solution
4.3. The Defect Prediction by Analytical Solution
5. Conclusions
- (1)
- Through the analysis of the four cases (A = 0.3, A = 0.5, A = 0.87 and of A calculated by the formula proposed in this paper), the temperature field distribution is calculated by the analytical solution presented in this paper. From the geometry of the melt pool, it can be seen that absorptivity has a significant effect on the melt pool configuration. Therefore, when performing thermal analysis, absorptivity cannot be regarded as a fixed value, but an experiment should be performed on absorptivity of the material to be printed. Based on the calculation of the obtained absorptivity, ideal process parameters will be quickly computed by the analytical solution, which can provide suggestions for production process engineers.
- (2)
- By comparing the analytical method, the experiment and the FE simulation, the results show that the analytical method for the prediction of the melt pool size is more consistent with the experimental results. Further, this method can quickly and accurately predict the thermal distribution of AM parts.
- (3)
- The analytical method is successfully applied to the prediction of the internal defects of the In718 by SLM, combined with the criteria of lack of fusion, keyholing and balling, the regime of the internal defects under different combinations of laser power and scanning speed is calculated, so as to obtain an ideal process parameter combination to avoid defects.
- (4)
- For the prediction of the keyholing regime, further in-depth discussions are still needed. In addition, the influence of the powder layer and hatching distance on the temperature field and the characteristics of the molten pool needs to be considered in the future.
Author Contributions
Funding
Conflicts of Interest
Appendix A
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Yang, H.; Li, Z.; Wang, S. The Analytical Prediction of Thermal Distribution and Defect Generation of Inconel 718 by Selective Laser Melting. Appl. Sci. 2020, 10, 7300. https://doi.org/10.3390/app10207300
Yang H, Li Z, Wang S. The Analytical Prediction of Thermal Distribution and Defect Generation of Inconel 718 by Selective Laser Melting. Applied Sciences. 2020; 10(20):7300. https://doi.org/10.3390/app10207300
Chicago/Turabian StyleYang, Huadong, Zhen Li, and Siqi Wang. 2020. "The Analytical Prediction of Thermal Distribution and Defect Generation of Inconel 718 by Selective Laser Melting" Applied Sciences 10, no. 20: 7300. https://doi.org/10.3390/app10207300
APA StyleYang, H., Li, Z., & Wang, S. (2020). The Analytical Prediction of Thermal Distribution and Defect Generation of Inconel 718 by Selective Laser Melting. Applied Sciences, 10(20), 7300. https://doi.org/10.3390/app10207300