Validation of thermal-kinetic-diffusion model for arc plasma surface hardening of steel

1996 ◽  
Vol 67 (6) ◽  
pp. 247-252 ◽  
Author(s):  
Michail Kryzhanovski
Keyword(s):  
Diffusion Model ◽  
Surface Hardening ◽  
Arc Plasma ◽  
Plasma Surface ◽  
Kinetic Diffusion

scholarly journals Effect of Surface Hardening on Dynamic Frictional Rolling Contact Behavior and Degradation of Corrugated Rail

2019 ◽  
Vol 2019 ◽  
pp. 1-15
Author(s):  
Yuan Gao ◽  
Jingmang Xu ◽  
Ping Wang ◽  
Yibin Liu
Keyword(s):  
Surface Hardening ◽  
Matrix Material ◽  
Rolling Contact ◽  
Superposition Method ◽  
Wear Depth ◽  
Plasma Surface ◽  
Contact Behavior ◽  
Rail Wear ◽  
The Matrix ◽  
Effect Of Surface

The present study was undertaken to evaluate the effect of surface hardening technology on dynamic frictional rolling contact behavior and degradation of corrugated rail in Shenzhen. Characteristic parameters such as length and depth of corrugation were analyzed by means of a continuous measurement method based on the corrugation analysis trolley. The explicit finite element method for material hardening characteristics and real contact geometry was adopted to set up the 3D transient FE model of wheel and rail, after which the value and distribution of stress/strain as well as contact solutions could be obtained during frictional contact, and then the Archard wear model and simplified wear superposition method are integrated as a numerical simulation tool for rail wear after hardening. The simulation results show that laminar plasma surface hardening technology can increase residual stress and shear stress in quenched zones, leading to local stress concentration at their boundaries; the plastic strain in the matrix material is higher than that in the quenched zones, while the strain concentration is mainly focused on the matrix material. The hardening can remarkably reduce the rail wear along the corrugation wave, and the wear depth of material with hardening technology is about 36% of that of nonhardening material. Laminar plasma surface hardening technology can therefore restrain the development of rail corrugation.

scholarly journals Influence of electrolyte-plasma surface hardening on the structure and properties of steel 40KhN

2019 ◽  
Vol 1393 ◽  
pp. 012119 ◽  
Author(s):  
B K Rakhadilov ◽  
Z A Satbayeva ◽  
L B Bayatanova ◽  
M K Kilyshkanov ◽  
K A Kalibayev ◽  
...  
Keyword(s):  
Surface Hardening ◽  
Structure And Properties ◽  
Plasma Surface ◽  
Steel 40Khn

Combustion of Flat Shaped Char Particles with Oxygen

2021 ◽  
pp. 1-17
Author(s):  
Henry Molintas ◽  
Ashwani K. Gupta
Keyword(s):  
Diffusion Model ◽  
Combustion Process ◽  
Conservation Equation ◽  
Pure Oxygen ◽  
Design Parameters ◽  
Energy Parameters ◽  
Energy Conservation Equation ◽  
Peak Energy ◽  
Kinetic Diffusion ◽  
The One

Abstract Thin flat-shaped carbon black particles of 1.5 mm thickness by 22.5 mm diameter were combusted in pure oxygen at atmospheric pressures and temperatures in the range of 500 to 650 °C. One film kinetic-diffusion model was derived to characterize the kinetic and energy parameters for particles arranged in the form of a thin flat-shaped configuration. The kinetic and energy parameters, and operating regimes of thin flat-shaped char particles were characterized during the non-isothermal combustion process. The gasification regimes during preheating were also analyzed. Steady-state energy processes were considered to derive an energy conservation equation used for calculating the evolution of char surface temperatures as well as released peak energy rates and the specific energy, which are considered key engineering design parameters. The one-film kinetic-diffusion model showed that combustion of such particles was purely kinetic controlled under these conditions. The activation energy obtained varied between 50 to 74 kJ/mol using discrete time and linear fits to the Arrhenius equation. The total energies released per weight of char converted varied between 32.8 and 40.6 kJ/g. The highest peak energy rate released was 134 J/s when combusting char in O2 at a reactor temperature of 504 °C.

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