Comparison of K-doped and pure cold-rolled tungsten sheets: Microstructure restoration in different temperature regimes

被引:3
|
作者
Lied, Philipp [1 ]
Pantleon, Wolfgang [2 ]
Bonnekoh, Carsten [1 ]
Duerrschnabel, Michael [1 ]
Bienert, Christian [3 ]
Hoffmann, Andreas [3 ]
Reiser, Jens [1 ]
Rieth, Michael [1 ]
机构
[1] Karlsruhe Inst Technol, Inst Appl Mat Appl Mat Phys, D-76344 Eggenstein Leopoldshafen, Germany
[2] Tech Univ Denmark, Dept Civil & Mech Engn, Sect Mat & Surface Engn, DK-2800 Lyngby, Denmark
[3] Plansee SE, A-6600 Reutte, Austria
来源
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS | 2023年 / 113卷
关键词
Fusion reactor materials; Extended recovery; Recrystallization; Grain growth; electron backscatter diffraction; Hardness indentation; BEHAVIOR;
D O I
10.1016/j.ijrmhm.2023.106198
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
For tungsten in divertor parts of future fusion reactors, a fine-grained microstructure is preferred to reduce its brittle-to-ductile transition temperature and minimize cracking events due to cyclic thermal and mechanical loading. In our ongoing study on tungsten sheets with different degree of deformation by warm-and cold-rolling, the potential of potassium-doping to stabilize the microstructure at high operation temperatures is assessed. Successful production of technically pure and equivalently rolled potassium-doped tungsten sheets up to very high logarithmic strains of 4.6 was already shown in the past with in-depth analysis of the evolution of microstructure and mechanical properties after rolling steps. Our current study investigates the microstructure changes in the same material batch by recovery, recrystallization and grain growth in temperature regimes between 600 degrees C and 2400 degrees C. Annealing studies with subsequent microhardness and SEM analysis reveal increased retardation of recrystallization in potassium-doped tungsten with higher rolling strain, but abnormal grain growth at high temperatures is also increased. However, potassium-doped tungsten with low rolling strain shows promising results with much less grain growth than its pure tungsten counterpart.
引用
收藏
页数:8
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