Effect of the hardened layer thickness of the formation of mesostructures during extension of surface hardened samples

1998 ◽  
Vol 41 (6) ◽  
pp. 564-568 ◽  
Author(s):  
V. E. Panin ◽  
A. I. Slosman ◽  
N. A. Kolesova ◽  
I. Yu. Molchunova ◽  
B. B. Ovechkin
Keyword(s):  
Layer Thickness ◽  
Hardened Layer ◽  
Hardened Layer Thickness

INVESTIGATION OF HARDENED LAYER THICKNESS ON COATINGS MADE BY EVAPORATION METHODS

2020 ◽  
pp. 38-42
Author(s):  
YU. A. KUZNETSOV ◽  
◽  
I. N. KRAVCHENKO ◽  
T. A. CHEKHA ◽  
D. T. ABDUMUMINOVA ◽  
...  
Keyword(s):  
Layer Thickness ◽  
Hardened Layer ◽  
Hardened Layer Thickness

Influence of Diffusional Surface Alloying on the Hardened-Layer Thickness for Gray-Iron Machine Parts

2018 ◽  
Vol 38 (11) ◽  
pp. 901-903 ◽  
Author(s):  
V. I. Vasil’ev ◽  
V. E. Ovsyannikov ◽  
R. Yu. Nekrasov ◽  
Yu. A. Tempel’
Keyword(s):  
Layer Thickness ◽  
Hardened Layer ◽  
Gray Iron ◽  
Surface Alloying ◽  
Machine Parts ◽  
Hardened Layer Thickness ◽  
Diffusional Surface

scholarly journals OPTIMIZATION OF CEMENTATION TECHNOLOGY OF TRACK LINK SLEEVES IN THE ATMOSPHERE METHANE-AIR MIXTURE

2020 ◽  
pp. 82-87
Author(s):  
V. A. Teldekov ◽  
L. M. Gurevich
Keyword(s):  
Energy Consumption ◽  
Natural Gas ◽  
Layer Thickness ◽  
Total Duration ◽  
Hardened Layer ◽  
Industrial Testing ◽  
Heating Furnaces ◽  
Gas Consumption ◽  
Shaft Furnaces ◽  
Natural Gas Consumption

New three- and four-cycle experimental cementation regimes for a layer thickness of up to 4.0 mm in an atmosphere of natural gas with air additives have been developed. Rational schemes for adding air to the atmosphere of methane for carburizing in shaft furnaces at different thicknesses of the hardened layer have been determined. Industrial testing of new modes has shown the possibility of reducing the total duration of the cementation process by 25%; significant reduction in energy consumption for heating furnaces and reduction of natural gas consumption for one carburizing mode by 35%.

Coercimetric Quality Testing of Steel Parts. Ural School of Coercimetry

NDT World ◽  
2015 ◽  
Vol 18 (4) ◽  
pp. 9-13
Author(s):  
Муриков ◽  
Sergey Murikov ◽  
Костин ◽  
Vladimir Kostin ◽  
Сташков ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Coercive Force ◽  
Hardened Layer ◽  
Scientific School ◽  
Deformation Degree ◽  
Practical Applications ◽  
Quality Testing ◽  
Hardened Layer Thickness ◽  
The Impact

The article shows the main areas of application coercimetric NDT method. The article presents historical information about the method founders who represents the Ural scientific school of magnetism. The main limitations of the method and practical applications of one-parameter and multiparameter coercimetric techniques are shown. Problems of magnetic quality inspection of quenched and tempered steels with different carbon contents and different degrees of alloying are considered. The possibility of monitoring the quality of steel products surface hardening with the use of external converters is demonstrated. Guidelines for external electromagnet size selection in dependence on a hardened layer thickness are presented. The brief analysis of the impact of current and residual stresses on the coercive force of steel products has been fulfilled. Problems of coercimetric inspection of stresses and steel plastic deformation degree are indicated; these problems are connected with varied behaviour of the coercive force under elastic extension and at high degrees of plastic deformation in the stage of pre-destruction. The originally developed technique for coercimetric quality control of forming rolls is presented. Information about modern coercimeters developed at the Institute of Metal Physics is provided.

scholarly journals Improvement of Mechanical, Tribological, and Fricative Reduction Properties of Pure Titanium by Boriding

2021 ◽  
Vol 11 (11) ◽  
pp. 4862
Author(s):  
Tong Chen ◽  
Shinji Koyama ◽  
Lihua Yu
Keyword(s):  
Room Temperature ◽  
Present Report ◽  
High Surface ◽  
Pure Titanium ◽  
Surface Hardness ◽  
Hardened Layer ◽  
Layer Growth ◽  
Different Temperatures ◽  
The Difference ◽  
Hardened Layer Thickness

Surface boriding of pure titanium was performed using dissolved salt impregnation to modify the surface hardness and improve wear performance. The effect of boriding temperature (950–1150 °C) on the microstructure, composition, and room-temperature tribological properties of the borided samples was investigated by X-ray diffraction, scanning electron microscopy, and ball-on-disc tribometry, respectively. Gibbs free energy was also calculated to evaluate the compounds generated during the boriding at different temperatures. After a detailed analysis of the crystal structures and the growth morphologies of TiB, the diffusion mechanisms for B atoms in TiB and TiB2 were discussed in the present report. The boriding temperature had a large effect on the microstructure, mechanical properties, and room-temperature tribological behavior of the borided samples, attributed to the changes in the composition and the increased hardened layer under elevated boriding temperature. The modeling of layer growth kinetics was also discussed in this paper. The actual value of hardened layer thickness was compared to the calculated value, and the difference was analyzed. The fricative value of the borided samples showed a minimum value of 88.9 dB for a boriding temperature of 1050 °C. The depth and width of the wear tracks decreased gradually with increasing boriding temperature. The worn surface of the samples borided at higher temperatures showed very good wear resistance. A boriding condition of 1050 °C was considered optimal, as it provided sufficiently high surface hardness and a low fricative value to reduce vibrations during practical use.

Theoretical and Technological Basics of the Friction Units’ Resource Increasing

2020 ◽  
Vol 303 ◽  
pp. 15-23
Author(s):  
V.E. Ovsyannikov ◽  
R.Yu. Nekrasov ◽  
M.V. Deneko ◽  
U.S. Putilova ◽  
D.P. Il’yaschenko
Keyword(s):  
Cast Iron ◽  
Gray Cast Iron ◽  
New Technology ◽  
Hardened Layer ◽  
Technology Application ◽  
Friction Units ◽  
Technical And Economic Analysis ◽  
Traditional Technologies ◽  
Hardened Layer Thickness ◽  
Production Conditions

The study considers the theoretical and technological aspects of the friction units’ resource increasing made of ferritic-pearlitic gray cast iron. It is found that chemical and thermal treatment has the best combination of criteria by the integrated technical and economic analysis for the cast iron parts’ hardening methods. The methods of the cast iron hardening used in practice are not applicable in the real production conditions. It happens because of the technological processes’ complexity and the equipment. Alternatively, the hardened layer thickness does not exceed 0.3 mm. The study considers the main aspects of the new technology application for the surface hardening, The recommendations for its application are formulated. They depend on the intended service of the part. The technical level of the offered solutions is estimated in comparison with traditional technologies of cast iron hardening.

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