Simulation of structure formation in the Fe–C–Cr–Ni–Si surfacing materials
Journal Title: Восточно-Европейский журнал передовых технологий - Year 2018, Vol 2, Issue 12
Abstract
<p>The paper investigates the formation of equilibrium phase state in the surfacing materials 300Cr25Ni3Si3 and 500Cr40Ni40Si2BZr, obtained by electric arc surfacing that employs powder tapes PL AN-101 and PL AN-111. This makes it possible to determine the relationship between chemical composition of the tape and the structure of the formed coating. To examine the patterns of phase transformations during crystallization, we applied thermodynamic simulation using the "Thermo-Calc Software". Phase diagrams of the system Fe-Cr-Ni-Si-C were constructed and analyzed; it was established that the alloys in equilibrium belong to the hypereutectic alloys. Their crystallization starts with the formation of primary carbides М<sub>7</sub>С<sub>3</sub> with a hexagonal lattice and ends with the eutectic transformation "Liquid ® Austenite + М<sub>7</sub>С<sub>3</sub>". The alloy 500Cr40Ni40Si2BZr at a temperature below 1,081 °C undergoes carbide transformations М<sub>7</sub>С<sub>3</sub>«М<sub>3</sub>С<sub>2</sub>. In the alloy 300Cr25Ni3Si3, austenite partially transforms into ferrite in a temperature range below 830 °C. At 600 °C, the alloys consist of the following phases: the alloy 300Cr25Ni3Si3 ‒ austenite, ferrite, and carbide М<sub>7</sub>С<sub>3</sub>; the alloy 500Cr40Ni40Si2BZr ‒ austenite and carbides М<sub>7</sub>С<sub>3</sub> and M<sub>3</sub>C<sub>2</sub>. It was established that the molar fraction of carbides in the alloy 500Cr40Ni40Si2BZr is considerably higher than that in the alloy 300Cr25Ni3Si3 (56 mol. % and 41 mol. %, respectively). We analyzed a change in the volumetric fraction and phase chemical composition of the alloys depending on temperature. The data obtained make it possible to predict the behavior of alloys under specific operating conditions.</p>
Authors and Affiliations
Bohdan Efremenko, Alexander Belik, Yuliia Chabak, Hossam Halfa
Keywords
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- EP ID EP527944
- DOI 10.15587/1729-4061.2018.124129
- Views 59
- Downloads 0
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