Impact of High-Power Heat Load and W Surface Carbidization on Its Structural-Phase Composition and Properties
Skakov M. Zhanbolatova G. Miniyazov A. Tulenbergenov T. Sokolov I. Sapatayev Y. Kozhakhmetov Y. Bukina O.
2021Bellwether Publishing, Ltd.
Fusion Science and Technology
2021#77Issue 157 - 66 pp.
This paper presents the results of a study on impact of high-power heat load and tungsten (W) surface carbidization on its structural-phase composition and physical-mechanical properties. In this regard, carbidization of a W surface was carried out by means of beam-plasma discharge in a simulation machine with plasma-beam installation. Certain data were obtained regarding temperature in control points of studied samples and temperature distribution throughout the monoblock element, made as a rectangle with an orifice for a cooling path, placed in a fusion reactor divertor. The paper demonstrates that changes in heat load power have an impact on microhardness, roughness, atomization of the carbidized W surface, and phase formation processes. It was established that a heat load q = 10 MW/m2 has very little effect on the elemental composition of the surface and structural-phase composition of W samples with a carbidized layer. Growth of thermal load up to q = 20 MW/m2 leads to a noticeable transformation of tungsten monocarbide (WC) into tungsten semicarbide (W2C) and cracking of the W sample surface.
divertor , ITER , phase structure , thermal load , tungsten carbide
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Institute of Atomic Energy Branch of the of the National Nuclear Center of the Republic of Kazakhstan (RSE NNC RK), Kurchatov, Kazakhstan
Institute of Atomic Energy Branch of the of the National Nuclear Center of the Republic of Kazakhstan (RSE NNC RK)
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