Deuterium Retention in a Nanostructured Tungsten Surface Layer Formed during High-Temperature Irradiation with Helium Plasma

2020 ◽  
Vol 14 (6) ◽  
pp. 1248-1253
Author(s):  
Z. R. Harutyunyan ◽  
O. V. Ogorodnikova ◽  
A. S. Aksenova ◽  
Yu. M. Gasparyan ◽  
V. S. Efimov ◽  
...  
Keyword(s):  
Surface Layer ◽  
High Temperature ◽  
Helium Plasma ◽  
Temperature Irradiation ◽  
Tungsten Surface ◽  
Deuterium Retention

scholarly journals Study of Resistance to Helium Swelling of Lithium-Containing Ceramics under High-Temperature Irradiation

Crystals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1350
Author(s):  
Dmitriy I. Shlimas ◽  
Artem L. Kozlovskiy ◽  
Askar Kh. Syzdykov ◽  
Daryn B. Borgekov ◽  
Maxim V. Zdorovets
Keyword(s):  
Surface Layer ◽  
High Temperature ◽  
Radiation Damage ◽  
Thermal Annealing ◽  
Reactor Core ◽  
Strength Properties ◽  
Radiation Defects ◽  
Temperature Irradiation ◽  
Thermal Sintering ◽  
Damage Processes

The aim of this work was to study resistance to helium accumulation processes in the structure of the surface layer of lithium-containing ceramics and the subsequent destruction and embrittlement processes, depending on radiation fluence. The objects of study were Li2TiO3-type ceramics obtained by thermal sintering. The fluence dependency of changes in the structural and strength properties of ceramics was determined to be in the range from 1018 to 1022 ion/m2, which corresponded to the concentration of implanted helium from 0.01% to 0.8–1 at.%. Irradiation was carried out at a temperature of 700 °C, which made it possible to simulate the processes of radiation damage that were closest to the real conditions in the reactor core. During the studies carried out, it was found that, at irradiation fluences of 1018–1020 ion/m2, the formation of point radiation defects was equaled by the process of thermal annealing of defects, as a result of which the concentration of defects and their effect on the change in the structural and strength properties of ceramics were insignificant. An increase in the concentration of implanted helium in the structure of the surface layer to above 0.5 at.% led to the dominance of radiation damage processes over the annealing of defects and the formation of gas-filled cavities, which negatively affects the strength of ceramics.

scholarly journals SCC Behavior at Hardened Surface Layer of 316(LC) in Water on High Temperature

2009 ◽  
Vol 58 (6) ◽  
pp. 228-233 ◽  
Author(s):  
Kiyoko Takeda ◽  
Akira Taniyama ◽  
Takeo Kudo ◽  
Hitoshi Uchida ◽  
Jun-ichiro Mizuki
Keyword(s):  
Surface Layer ◽  
High Temperature ◽  
Hardened Surface

Research on high-temperature oxidation resistance, hot forming ability, and microstructure of Al–Si–Cu coating for 22MnB5 steel

2021 ◽  
Vol 40 (1) ◽  
pp. 397-409
Author(s):  
Ziliu Xiong ◽  
Zhangguo Lin ◽  
Jianjun Qi ◽  
Li Sun ◽  
Guangxin Wu ◽  
...  
Keyword(s):  
Surface Layer ◽  
High Temperature ◽  
Oxidation Resistance ◽  
High Temperature Oxidation ◽  
Hot Stamping ◽  
Optical Microscope ◽  
Hot Forming ◽  
Metal Compound ◽  
Temperature Oxidation ◽  
Substrate Steel

Abstract High-temperature oxidation resistance, hot formability, element distribution, and microstructure of Al-10% Si-(0.5–3.0%)Cu coating were investigated by means of glow discharge spectroscopy, optical microscope, scanning electron microscope, and energy-dispersive spectroscopy. Results show that the addition of Cu can increase high-temperature oxidation resistance above 950°C and improve hot formability so that no crack spreads into substrate steel as hot forming at 33.3% strain. Oxidation film structure is continual and compacting, and Si highly concentrates in the surface layer. The distribution of Cu has skin effect with peaking content 8.2% in the surface layer. After hot stamping, Al and Si diffuse into substrate steel, and Cu diffuses from inner to outer coating. Al–Si–Cu coating has smoother surface, straighter diffusion layer, and finer metal compound than Al–Si coating. Surface and diffusion layers are identified as aluminum oxide, Si-rich, and Cu phase and Al7SiFe2, Al3Fe, and CuAl3, respectively. Al-rich phase and the metal compound are composed of α-Al dissolving Fe, Si, and Cu and Al–Si matrix, Cu3Al, respectively.

scholarly journals THE INFLUENCE OF THE SOAKING TEMPERATURE OF NITRIDED WCL TOOL STEEL (EN-X37CrMoV5-1) ON THE MICROHARDNESS AND TRIBOLOGICAL WEAR OF THE SURFACE LAYER

Tribologia ◽  
2016 ◽  
Vol 268 (4) ◽  
pp. 69-78
Author(s):  
Michał DWORAK ◽  
Adrian BARYLSKI ◽  
Krzysztof ANIOŁEK ◽  
Elizaveta STEPANOVA
Keyword(s):  
Surface Layer ◽  
High Temperature ◽  
Low Temperature ◽  
Tool Steel ◽  
Nitrided Layer ◽  
Industrial Furnace ◽  
Tribological Tests ◽  
Nitrided Steel ◽  
Hot Work Tool Steel ◽  
Soaking Temperature

The present paper refers to the evaluation of the influence of soaking temperature of nitrided hot work tool steel, X37CrMoV5-1 (WCL), intended for dies for extruding aluminium profiles, on the structure, microhardness, and tribological wear of the nitrided layer. The research involved nitrided steel specimens (X37CrMoV5-1) soaked for 8 hours in an industrial furnace at temperatures of 450°C, 480°C, 520°C, 560°C, and 600°C. For comparison purposes, a REFERENCES material was used, which was not soaked after nitriding. Initially, as the soaking temperature raised, the microhardness of the nitrided layer increased by ca. 10%; however, a further increase in the soaking temperature to more than 450°C caused a decrease in the microhardness of the nitrided layer. The results of tribological tests showed that soaking nitrided steel at a low temperature (450°C) and high temperature (600°C) caused a decrease in tribological wear. Out of the tested materials, the highest microhardness of the upper layer was observed in the samples soaked at 450°C, while the highest resistance to tribological wear was obtained for the samples soaked at 600°C. The conducted tests indicate the possibility of extending the lifetime of dies made from the investigated nitrided steel.

Surface modification of die steels with B—Al-layers by thermal-chemical treatment

2021 ◽  
pp. 557-564
Author(s):  
N.S. Ulakhanov ◽  
U.L. Mishigdorzhiyn ◽  
A.G. Tikhonov ◽  
A.I. Shustov ◽  
A.S. Pyatykh
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Surface Layer ◽  
Surface Modification ◽  
High Temperature ◽  
Chemical Treatment ◽  
Quality Parameters ◽  
Processing Temperature ◽  
Die Steels ◽  
Composite Layers

The effect of diffusion high-temperature boroaluminizing (HBA) on the mechanical properties and quality parameters of the surface layer of stamp steels 5KhNM and 3Kh2V8F is shown. An analysis of the microstructure and composition of diffusion composite layers obtained as a result of thermal-chemical treatment (TCT) is presented and the distribution of microhardness in these layers is studied depending on the formed borides and carbides. The influence of processing temperature modes of on the parameters of roughness was experimentally established and the wear resistance characteristics of the processed surfaces of the investigated materials were determined.

scholarly journals High temperature irradiation induced creep in Ag nanopillars measured via in situ transmission electron microscopy

2018 ◽  
Vol 148 ◽  
pp. 1-4 ◽  
Author(s):  
Gowtham Sriram Jawaharram ◽  
Patrick M. Price ◽  
Christopher M. Barr ◽  
Khalid Hattar ◽  
Robert S. Averback ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
High Temperature ◽  
Transmission Electron ◽  
Temperature Irradiation

Laser Pulse Melting of Metals: Epitaxy and Allotropy

1980 ◽  
Vol 1 ◽  
Author(s):  
L. Buene ◽  
E. N. Kaufmann ◽  
C. M. Preece ◽  
C. W. Draper
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Surface Layer ◽  
High Temperature ◽  
Laser Pulse ◽  
Single Crystals ◽  
Laser Power ◽  
Rutherford Backscattering ◽  
Scanning Electron ◽  
Crystallographic Orientations

ABSTRACTLaser pulse melted single crystals of several metals have been examined by the Rutherford backscattering/channeling technique and with optical and scanning electron microscopy. Metals belonging to the three major structure groups; fcc (Ni, Pd, Rh); bcc(Mo, Nb, W, Fe); and hcp (Be, Ti, Re) have been studied at various laser power levels and in different crystallographic orientations. Of these cases, Be, Ti and Fe show high temperature allotropes which are expected to influence the character of the resolidified surface layer.

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