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Authors = Dmitrii Mukin

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13 pages, 5078 KiB  
Article
Cracking Behavior of the ZhS6K Superalloy during Direct Laser Deposition with Induction Heating
by Anastasiia Dmitrieva, Anastasiya Semenyuk, Margarita Klimova, Ilya Udin, Dmitrii Mukin, Artur Vildanov, Sergey Zherebtsov, Olga Klimova-Korsmik and Nikita Stepanov
Metals 2024, 14(6), 610; https://doi.org/10.3390/met14060610 - 22 May 2024
Cited by 2 | Viewed by 1250
Abstract
For this work, the behavior of the ZhS6K alloy (Russian grade) in the process of direct laser deposition was investigated. Two samples, a “small” one (40 × 10 × 10 mm3) and “large” one (80 × 16 × 16 mm3 [...] Read more.
For this work, the behavior of the ZhS6K alloy (Russian grade) in the process of direct laser deposition was investigated. Two samples, a “small” one (40 × 10 × 10 mm3) and “large” one (80 × 16 × 16 mm3), were fabricated with direct laser deposition. In both samples, the typical dual-phase γ/γ’ microstructure with cuboidal shape of the γ’ precipitates was observed. Both specimens revealed a similar tendency to continuous increasing in hardness from the bottom to the top associated with the refinement of γ’ precipitates. The “small” sample was essentially crack-free, while the “large” one underwent extensive cracking. The possible effects of various factors, including thermal history, size, and shape of the gamma grains, on cracking behavior were discussed. Full article
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14 pages, 3044 KiB  
Article
Influence of Latent Heat of Fusion on the Melt Pool Shape and Size in the Direct Laser Deposition Process
by Gleb Turichin, Dmitrii Mukin, Ekaterina Valdaytseva and Maksim Sannikov
Materials 2022, 15(23), 8349; https://doi.org/10.3390/ma15238349 - 24 Nov 2022
Cited by 3 | Viewed by 2298
Abstract
The melt pool calculating method is presented based on the solution of the heat conduction problem in a three-dimensional formulation, taking into account the latent heat of fusion and the change in thermophysical properties with temperature. In this case, the phase transitions of [...] Read more.
The melt pool calculating method is presented based on the solution of the heat conduction problem in a three-dimensional formulation, taking into account the latent heat of fusion and the change in thermophysical properties with temperature. In this case, the phase transitions of melting and crystallization are accounted for using the source method. Considering the latent heat of fusion in the heat transfer process leads to melt pool elongation, as well as to a slight decrease in its width and depth. Depending on the mode, the melt pool elongation can be up to 22%. The penetration depth is reduced by about 5%. The deposition width does not change practically. The presented model was validated by comparing the experimentally determined melt pool shape and its dimensions with the corresponding theoretically calculated results. Experimental data were obtained as a result of coaxial video recording and the melt pool crystallization. The calculated form of the crystallization isotherm changes from a U-shape to a V-shape with an increase in the power and speed of the process, which coincides with the experimental data. Full article
(This article belongs to the Special Issue Experimental Research and Numerical Simulations of Metal Additive Manufacturing)
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18 pages, 5426 KiB  
Article
An Extended Analytical Solution of the Non-Stationary Heat Conduction Problem in Multi-Track Thick-Walled Products during the Additive Manufacturing Process
by Dmitrii Mukin, Ekaterina Valdaytseva, Gleb Turichin and Artur Vildanov
Materials 2021, 14(23), 7291; https://doi.org/10.3390/ma14237291 - 28 Nov 2021
Cited by 3 | Viewed by 2531
Abstract
An analytical model has been developed for calculating three-dimensional transient temperature fields arising in the direct deposition process to study the thermal behavior of multi-track walls with various configurations. The model allows the calculation of all characteristics of the temperature fields (thermal cycles, [...] Read more.
An analytical model has been developed for calculating three-dimensional transient temperature fields arising in the direct deposition process to study the thermal behavior of multi-track walls with various configurations. The model allows the calculation of all characteristics of the temperature fields (thermal cycles, cooling rates, temperature gradients) in the wall during the direct deposition process at any time. The solution of the non-stationary heat conduction equation for a moving heat source is used to determine the temperature field in the deposited wall, taking into account heat transfer to the environment. The method considers the size of the wall and the substrate, the change in power from layer to layer, the change in the cladding speed, the interpass dwell time (pause time), and the heat source trajectory. Experiments on the deposition of multi-track block samples are carried out, as a result of which the values of the temperatures are obtained at fixed points. The proposed model makes it possible to reproduce temperature fields at various values of the technological process parameters. It is confirmed by comparisons with experimental thermocouple data. The relative difference in the interlayer temperature does not exceed 15%. Full article
(This article belongs to the Special Issue Modeling of Materials Manufacturing Processes)
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12 pages, 3126 KiB  
Article
Analytical Solution of the Non-Stationary Heat Conduction Problem in Thin-Walled Products during the Additive Manufacturing Process
by Dmitrii Mukin, Ekaterina Valdaytseva and Gleb Turichin
Materials 2021, 14(14), 4049; https://doi.org/10.3390/ma14144049 - 20 Jul 2021
Cited by 7 | Viewed by 3025
Abstract
The work is devoted to the development of a model for calculating transient quasiperiodic temperature fields arising in the direct deposition process of thin walls with various configurations. The model allows calculating the temperature field, thermal cycles, temperature gradients, and the cooling rate [...] Read more.
The work is devoted to the development of a model for calculating transient quasiperiodic temperature fields arising in the direct deposition process of thin walls with various configurations. The model allows calculating the temperature field, thermal cycles, temperature gradients, and the cooling rate in the wall during the direct deposition process at any time. The temperature field in the deposited wall is determined based on the analytical solution of the non-stationary heat conduction equation for a moving heat source, taking into account heat transfer to the environment. Heat accumulation and temperature change are calculated based on the superposition principle of transient temperature fields resulting from the heat source action at each pass. The proposed method for calculating temperature fields describes the heat-transfer process and heat accumulation in the wall with satisfactory accuracy. This was confirmed by comparisons with experimental thermocouple data. It takes into account the size of the wall and the substrate, the change in power from layer to layer, the pause time between passes, and the heat-source trajectory. In addition, this calculation method is easy to adapt to various additive manufacturing processes that use both laser and arc heat sources. Full article
(This article belongs to the Special Issue Modeling of Materials Manufacturing Processes)
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