scholarly journals The nitride ceramics surface layer stress state transformation under the variation of the TiC-coating thickness. The applied load is the heat current

2017 ◽  
pp. 54-60
Author(s):  
V. V. Kuzin ◽  
M. Yu Fedorov ◽  
M. A. Volosova
Keyword(s):  
Surface Layer ◽  
Stress State ◽  
Coating Thickness ◽  
Applied Load ◽  
Heat Current ◽  
State Transformation ◽  
Nitride Ceramics

Fastness of Protective and Decorative Coatings Construction Products and Structures to the Action of Wind

2021 ◽  
Vol 410 ◽  
pp. 773-777
Author(s):  
Valentina I. Loganina ◽  
Bassam Shareef Deneef Al Saedi
Keyword(s):  
Stress State ◽  
Pore Size ◽  
Coating Thickness ◽  
Critical Value ◽  
Wind Load ◽  
Construction Products ◽  
Discrete Nature

The article provides information about the stress state protective and decorative coatings during aging. The influence of the discrete nature of the substrate on the change in the stress state of the coatings from the action of the wind load is considered. It was revealed that for each type of coating there is its own critical value of the pore size (unfilled paint), the excess of which leads to cracking of the coatings. A method is proposed for selecting the optimal coating thickness.

Stresses in the Surface Layer and Hydrogen Absorption and Diffusion in Cavitation Condition

2014 ◽  
Vol 225 ◽  
pp. 131-138
Author(s):  
Jarosław Chmiel ◽  
Jolanta Baranowska ◽  
Roman Jędrzejewski ◽  
Arkadiusz Rzeczycki
Keyword(s):  
Surface Layer ◽  
Stress State ◽  
Hydrogen Absorption ◽  
Surface Layers ◽  
Fem Modeling ◽  
And Diffusion

Cavitation attack in liquids generated a various states of stresses in surface layers of metals. Differences in stress state effects on hydrogen absorption activated by the cavitation implosion. Results of XRD investigation and FEM modeling shows on inhomogenity of process.

scholarly journals Study of Helium Swelling in Nitride Ceramics at Different Irradiation Temperatures

Materials ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 2415 ◽  
Author(s):  
Maxim. V. Zdorovets ◽  
Kanat Dukenbayev ◽  
Artem. L. Kozlovskiy
Keyword(s):  
Crystal Structure ◽  
Surface Layer ◽  
Room Temperature ◽  
Sharp Decrease ◽  
Radiation Doses ◽  
Near Surface ◽  
Helium Bubbles ◽  
Density Of Dislocations ◽  
Nitride Ceramics ◽  
Average Size

This paper presents the results of a systematic study of helium swelling and the subsequent process of degradation of the near-surface layer of aluminum-based nitride ceramics. The samples were irradiated with 40 keV He2+ ions at temperatures of 300 and 1000 K with a fluence of 1 × 1017–5 × 1017 ions/cm2. The choice of radiation doses and temperature conditions was due to the possibility of simulating reactor tests of structural materials. It has been established that an increase in the irradiation fluence leads to the formation of large agglomerates of clusters of helium bubbles, as well as an increase in the degree of roughness and waviness of the surface with the formation of crater-like inclusions. In the case of irradiation at high temperatures, there was a slight decrease in the average size of helium inclusions compared with irradiation at room temperature. However, the density of inclusions and surface roughness were much higher. It is established that irradiation at room temperatures leads to a sharp decrease in ceramics density, as well as deformation of the crystal structure due to an increase in the density of dislocations and macrostresses in the structure. The decrease in ceramics density due to the formation of helium inclusions led to an increase in porosity and a defective fraction in the structure of the surface layer of ceramics.

Wear behavior of electrodeposited nickel coating on ZP5 zinc alloy

2020 ◽  
Vol 234 (10) ◽  
pp. 1291-1302
Author(s):  
Dario Croccolo ◽  
Massimiliano De Agostinis ◽  
Stefano Fini ◽  
Giorgio Olmi ◽  
Robusto Francesco ◽  
...  
Keyword(s):  
Coating Thickness ◽  
Applied Load ◽  
Nickel Coating ◽  
Wear Behavior ◽  
Zinc Alloy ◽  
Corrosive Environment ◽  
Statistical Tool ◽  
Aisi 304 ◽  
Electrodeposited Nickel ◽  
Sliding Distance

Nickel coating on zinc alloy is quite promising for the achievement of an additional wear improvement in corrosive environment. To investigate this point, block-on-ring tests were carried out. Blocks measuring 5 × 5×20 mm3 were obtained from real locking components, made of ZP5 EN 12844 and coated by Zn/Cu1Ni5s ISO 1458. As counter material, an AISI 304 with a 40 mm diameter cylindrical geometry was used. Three load levels (5, 10 and 15 N) and three coating thickness levels (low: 5 to 10 µm; medium: 10 to 15 µm; high: 15 to 20 µm) were considered. The sliding distance was initially set to 500 m. Then, since the coating was worn out very quickly during the test, the sliding distance was set to 150 m. The results, in terms of volume loss due to wear, were processed using the statistical tool of two-way ANOVA and Fisher test. It was assessed that the wear rate is strongly affected by the applied load. The coating thickness does not significantly affect the wear.

Influence of the deforming tool kinematics on the stress state of the surface layer during hardening of cylindrical parts

2021 ◽  
pp. 28-32
Author(s):  
Keyword(s):  
Plastic Deformation ◽  
Surface Layer ◽  
Stress State ◽  
Surface Plastic Deformation ◽  
Surface Plastic ◽  
The Finite Element Method ◽  
Kinematic Scheme ◽  
Local Surface ◽  
Hardening Process ◽  
Cylindrical Parts

The influence of kinematic schemes of processing by local surface plastic deformation on the intensification of the stressed state of cylindrical surfaces of parts is considered. On the basis of the finite element method by computer simulation, a mathematical model of the hardening process was obtained to determine the stress state in the surface layer for different hardening schemes. Keywords: kinematic scheme of processing, deforming tool, orbital burnishing, intensification of the stress state, residual stresses, depth of plastic deformation. [email protected], [email protected]

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