Improvement in wear resistance of steel 40KhMFA tool joints by the ionic nitriding method

1992 ◽  
Vol 28 (3) ◽  
pp. 207-209
Author(s):  
M. V. Yaroshenko ◽  
L. S. Mirzoyan
Keyword(s):  
Wear Resistance ◽  
Ionic Nitriding

scholarly journals The Joint Effects of Nitriding and Parameters Related to the Destabilisation of Austenite on Wear Resistance in White Cast Iron with 25% Cr

Metals ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 85
Author(s):  
Alejandro González-Pociño ◽  
Florentino Alvarez-Antolin ◽  
Juan Asensio-Lozano
Keyword(s):  
Wear Resistance ◽  
Cast Iron ◽  
White Cast Iron ◽  
Nitrided Layer ◽  
Erosive Wear ◽  
Air Cooling ◽  
Cast Irons ◽  
Eutectic Carbides ◽  
Noticeable Increase ◽  
Ionic Nitriding

In this article, the effects of an ionic nitriding treatment are analysed, together with deliberate variation of different thermal parameters associated with the destabilisation of austenite, on erosive wear resistance of white cast irons with 25% Cr. The methodology followed in this research was an experimental design, where six factors were analyzed by performing eight experiments. The thickness of the nitrided layer is much smaller than in white cast iron with lower percentages in Cr, never reaching 20 microns. The nitriding treatment entails considerable softening of the material underneath the nitriding layer. This softening behaviour becomes partially inhibited when the destabilisation temperature of austenite is 1100 °C and dwell times at such temperature are prolonged. This temperature seems to play a significant role in the solubilization of non-equilibrium eutectic carbides, formed during industrial solidification. The nitriding treatment leads to additional hardening, which, in these cases, favours a second destabilisation of austenite, with additional precipitation of secondary carbides and the transformation of retained austenite into martensite. Despite softening of the material, the nitriding treatment, together with air-cooling after destabilisation of the austenite, allows a noticeable increase in resistance to erosive wear.

scholarly journals Optimization, by Means of a Design of Experiments, of Heat Processes to Increase the Erosive Wear Resistance of White Hypoeutectic Cast Irons Alloyed with Cr and Mo.

Metals ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 403 ◽  
Author(s):  
Alejandro Gonzalez-Pociño ◽  
Florentino Alvarez-Antolin ◽  
Juan Asensio-Lozano
Keyword(s):  
Wear Resistance ◽  
Nitrided Layer ◽  
Erosive Wear ◽  
Design Parameters ◽  
Cast Irons ◽  
Tempering Temperature ◽  
Ionic Nitriding ◽  
Quench Cooling ◽  
Cooling Media ◽  
Heat Processes

To identify the design parameters in heat treatments that have a significant effect on the erosive wear resistance of hypoeutectic high chromium white cast irons, a design of experiment was applied to a white cast iron with 18wt.% Cr and 2wt.% Mo. The analyzed factors were the destabilization heat treatment of austenite (1000 or 1100 °C, for 4 or 8 h), different quench cooling media (in air or oil), different tempering treatments (200 or 500 °C, for 3 or 6 h), and the application of an ionic nitriding treatment. Despite what was expected, the nitriding treatment was not found to have a significant effect on said wear resistance. However, it is concluded that the highest wear resistance is obtained with the shortest dwell time at the destabilization temperature (4 h), quenching in oil, and with the shortest tempering times (3 h). Among the nitrided samples, the highest nitrided layer thicknesses were obtained when the destabilization temperature of the austenite was 1000 °C and the tempering temperature was 200 °C.

Application of TEM to Deformation, Wear, and Fracture of Ceramics

1974 ◽  
Vol 32 ◽  
pp. 472-473
Author(s):  
B. J. Hockey
Keyword(s):  
Wear Resistance ◽  
High Temperature ◽  
Mechanical Behavior ◽  
Brittle Materials ◽  
High Temperature Strength ◽  
Wide Range ◽  
Corrosive Environments ◽  
Further Development

Ceramics, such as Al2O3 and SiC have numerous current and potential uses in applications where high temperature strength, hardness, and wear resistance are required often in corrosive environments. These materials are, however, highly anisotropic and brittle, so that their mechanical behavior is often unpredictable. The further development of these materials will require a better understanding of the basic mechanisms controlling deformation, wear, and fracture.The purpose of this talk is to describe applications of TEM to the study of the deformation, wear, and fracture of Al2O3. Similar studies are currently being conducted on SiC and the techniques involved should be applicable to a wide range of hard, brittle materials.

Abrasive wear of polymer/steel gear drives

2008 ◽  
Vol 4 (1) ◽  
pp. 1-26
Author(s):  
Gábor Kalácska
Keyword(s):  
Wear Resistance ◽  
Abrasive Wear ◽  
Material Selection ◽  
Solid Particles ◽  
Soil Types ◽  
General View ◽  
Modern Engineering ◽  
Clean Environment ◽  
Engineering Polymers ◽  
Plastic Gears

Research was performed on the friction, wear and efficiency of plastic gears made of modern engineering polymers and their composites both in a clean environment (adhesive sliding surfaces) and in an environment contaminated with solid particles and dust (abrasive), with no lubrication at all. The purpose is to give a general view about the results of abrasive wear tests including seven soil types as abrasive media. At the first stage of the research silicious sand was applied between the meshing gears and the wear of plastic and steel gears was evaluated and analyzed from the point of different material properties (elongation at break, hardness, yield stress, modulus of elasticity) and its combinations. The different correlations between the experienced wear and material features are also introduced. At the second stage of the project the abrasive sand was replaced with different physical soil types. The abrasive wear of gears is plotted in the function of soil types. The results highlight on the considerable role of physical soil types on abrasive wear resistance and the conclusions contain the detailed wear resistance. The results offer a new tribology database for the operation and maintenance of agricultural machines with the opportunity of a better material selection according to the dominant soil type. This can finally result longer lifetime and higher reliability of wearing plastic/steel parts.

Comparative high-temperature wear resistance of CHS88U-VI alloy and H30N50YU5T2 satellite

2014 ◽  
Vol 0 (4) ◽  
Author(s):  
Oleksandr M. Kostin ◽  
Anastasiia Yu. Butenko ◽  
Volodymyr O. Martynenko
Keyword(s):  
Wear Resistance ◽  
High Temperature ◽  
High Temperature Wear

Tempering and wear resistance of laser cladded MMC coating for corrugated rollers

2007 ◽  
Author(s):  
Zhaoyong Qian ◽  
Minlin Zhong ◽  
Wenjin Liu ◽  
Dongye Zhang ◽  
Ruiquan Kang
Keyword(s):  
Wear Resistance

INCREASING THE WEAR RESISTANCE OF ELEMENTS AND COMPONENTS OF FORGING AND STAMPING EQUIPMENT (FOR EXAMPLE, PERFORMING SEPARATION OPERATIONS)

2020 ◽  
Author(s):  
K.O. Kobzev ◽  
◽  
S.A. Vyalov ◽  
E.S Bozhko ◽  
I.A. Zolotuhina ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Technological Capabilities ◽  
Recoil Force ◽  
The Press ◽  
Strength And Durability

The article describes the possibilities of increasing the durability of crank presses. The influence of the main parameters of the press on the value of the recoil force was studied. Based on the analysis of this topic, the types of expansion of technological capabilities of crank presses and their strength and durability were summarized.

Project to improve wear resistance of gas separators of electric submersible pumps at Rosneft Oil Company

2020 ◽  
pp. 62-65
Author(s):  
D.А. Minchenko ◽  
◽  
S.B. Yakimov ◽  
A.B. Noskov ◽  
D.A. Kosilov ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Improve Wear Resistance ◽  
Oil Company

Dependence of the lifelength of a hydraulic hammer pick on the wear resistance of its material

2020 ◽  
Vol 5 ◽  
pp. 68-79
Author(s):  
V.I. Bolobov ◽  
◽  
Thanh Binh Le ◽  
S.A. Chupin ◽  
V.A. Plashchinsky ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Hydraulic Hammer
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