scholarly journals Experimental Study of Abrasive, Mechanical and Corrosion Effects in Ring-on-Ring Sliding Contact

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 4950
Author(s):  
Jaroslaw Selech ◽  
Dariusz Ulbrich ◽  
Dawid Romek ◽  
Jakub Kowalczyk ◽  
Konrad Wlodarczyk ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Sugar Industry ◽  
Thermochemical Treatment ◽  
Sliding Contact ◽  
Ring Test ◽  
Percentage Increase ◽  
Surface Layers ◽  
Factors Affecting ◽  
Flame Hardening ◽  
Chrome Layer

This article presents the application of the ring-on-ring test to investigate some of the important factors affecting the abrasive and corrosion wear of a face seal used in the sugar industry. The test involves the sliding contact between two steel rings working in different conditions such as mechanic, abrasive, corrosive extortions and its combination. Rings were made of the C45 steel and the surface layers were modified by heat and thermochemical treatment such as normalizing, flame hardening, nitriding and chrome diffusion. Maximum wear of the sample after tests under mechanic, abrasive and corrosion extortion were obtained. For C45 steel without surface modification the biggest wear was obtained for mechanical, abrasive and corrosive extortion and equals 0.0138 g. This value was three times bigger than the result for the mechanical extortion and ten times than for the corrosive conditions. For individual research options the percentage increase or decrease in wear resistance in relation to the normalized surface layer was determined. In the corrosive extortion the highest increase (90%) of wear resistance was recorded for the chrome layer relative to normalizing sample. The main conclusion of the paper is that the wear effect caused by all factors—mechanical, abrasive and corrosive—is not a straight sum of values of wear.

TLS A7 MODIFIED

Alloy Digest ◽  
2007 ◽  
Vol 56 (4) ◽  
Keyword(s):  
Wear Resistance ◽  
Physical Properties ◽  
Tool Steel ◽  
Heat Treating ◽  
Sliding Contact ◽  
Vanadium Carbides

Abstract TLS A7 Mod. is a modified A7 tool steel that is air hardening and has exceptional wear resistance due to vanadium carbides. It is especially good in sliding contact and often used to handle wet slurries. This datasheet provides information on composition, physical properties, and hardness. It also includes information on wear resistance as well as forming, heat treating, and machining. Filing Code: TS-645. Producer or source: Timken Latrobe Steel.

scholarly journals Explosive and thermochemical treatment of multi-layer metallic composites

2019 ◽  
pp. 51-56
Author(s):  
Jerzy Nowaczewski ◽  
Milena Kita ◽  
Justyna Świeczak ◽  
Jacek Rudnicki
Keyword(s):  
Cross Sections ◽  
Intermediate Phase ◽  
Intermetallic Layer ◽  
Thermochemical Treatment ◽  
Ion Nitriding ◽  
Surface Layers ◽  
Before And After ◽  
The Individual ◽  
Current Systems ◽  
Composite Samples

The paper describes methods for the explosive hardening of metals which were performed with a view to increasing the hardness of previously obtained composites, as well as treatment of their surface layers to increase the efficiency of further thermochemical treatment. Typical systems for explosive hardening of metals and the construction of current systems, are discussed. The resulting effects of explosive hardening are illustrated with before and after diagrams of microhardness distributions in cross-sections of the processed composites hardening. In a further processing stage, the tested composite samples were subjected to ion nitriding. As a result of this process, in addition to the typical increase in hardness of the individual layers, an intermediate phase with a distinctly higher hardness was observed in the junction zone. Preliminary analysis of the photographs and the results from a scanning electron microscope (SEM) with an energy dispersive spectroscopy (EDS) attachment suggests that the particularly beneficial properties of the composites are attributed to the presence of the intermetallic layer.

Modifying of the Surface of Products from Cast Iron as the Element of Production Modernization

2020 ◽  
Vol 299 ◽  
pp. 588-593
Author(s):  
Nataliia Vodolazskaya ◽  
Olga Sharaya
Keyword(s):  
Wear Resistance ◽  
Cast Iron ◽  
Saturation Temperature ◽  
Thermochemical Treatment ◽  
Structural Condition ◽  
Surface Wear ◽  
Layer Depth ◽  
Cast Irons ◽  
Process Duration ◽  
Surface Impregnation

The way of solving the problem of surface wear of products from cast iron due to development of technological processes of its strengthening treatment is offered in this article. Receiving the hardened skins is reached by purposeful formation of the set structural condition of metal by methods of surface impregnation, i.e., modifying. Results of researches on thermochemical treatment of cast irons of grades EN-GJL-250, EN-JS1060 are presented The micro-structural analysis showed that with rising the saturation temperature and increasing the process duration the layer depth cartbonitration increases. Studying the samples for wear resistance carried out on stand ММ 295 showed that for grade EN-GJL-250 it increased 2,2 times, and for grade EN-JS1060 – 3 times as compared to the initial (non-modified) state. Experimental-industrial tests of products of cast iron (model accessory, parts of homogenizing pumps) after carbonitration permitted to state 2-4 times of its surface.

Effects of Electrolyte Plasma Carbonitriding on Tribological Properties of High Speed Steel

2013 ◽  
Vol 712-715 ◽  
pp. 7-11 ◽  
Author(s):  
Mazhyn Skakov ◽  
Bauyrzhan Rakhadilov ◽  
Michael Sсheffler
Keyword(s):  
Wear Resistance ◽  
Tribological Properties ◽  
High Speed ◽  
High Speed Steel ◽  
Scratch Test ◽  
Abrasive Wear Resistance ◽  
R6m5 Steel ◽  
Surface Layers ◽  
Test Conditions ◽  
Modified Layer

This paper presents research of influence electrolyte plasma carbonitriding on tribological properties of R6M5 high-speed steel. Shows perspectiveness of carbonitriding high-speed steels in electrolyte plasma. The results of research demonstrated increasing wear-resistance of R6M5 steel after carbonitriding in electrolyte plasma. Under the same test conditions by the method of scratch-test have been determined that the depth of the scar of a modified layer has become less in comparison with the original sample, which indicates a significant increase of wear-resistance and hardness of the surface carbonitriding layer R6М5 steel. It was set that after electrolytic-plasma carbonitriding abrasive wear-resistance of the surface layers of R6M5 steel is increased by 25%. Introduction

scholarly journals Characterization of the Surface Layer of Mg Enriched with Al and Si by Thermochemical Treatment

2017 ◽  
Vol 17 (4) ◽  
pp. 195-199 ◽  
Author(s):  
R. Mola ◽  
E. Stępień ◽  
M. Cieślik
Keyword(s):  
Solid Solution ◽  
Thermochemical Treatment ◽  
Heating Time ◽  
Substrate Material ◽  
Surface Layers ◽  
X Ray ◽  
Three Phase ◽  
Distribution Of Elements ◽  
Modified Surface

AbstractThe modified surface layers of Mg enriched with Al and Si were fabricated by thermochemical treatment. The substrate material in contact with an Al + 20 wt.% Si powder mixture was heated to 445°C for 40 or 60 min. The microstructure of the layers was examined by OM and SEM. The chemical composition of the layer and the distribution of elements were determined by energy dispersive X-ray spectroscopy (EDS). The experimental results show that the thickness of the layer is dependent on the heating time. A much thicker layer (1 mm) was obtained when the heating time was 60 min than when it was 40 min (600 μm). Both layers had a non-homogeneous structure. In the area closest to the Mg substrate, a thin zone of a solid solution of Al in Mg was detected. It was followed by a eutectic with Mg17Al12and a solid solution of Al in Mg. The next zone was a eutectic with agglomerates of Mg2Si phase particles; this three-phase structure was the thickest. Finally, the area closest to the surface was characterized by dendrites of the Mg17Al12phase. The microhardness of the modified layer increased to 121-236 HV as compared with 33-35 HV reported for the Mg substrate.

Assessment of Hydroabrasive Wear Resistance of Construction Materials with Functional Coatings, which are Formed by Resource-Saving and Environmentally Friendly Technologies

2020 ◽  
Vol 864 ◽  
pp. 265-277
Author(s):  
Viacheslav Tarelnyk ◽  
Ievgen Konoplianchenko ◽  
Oksana Gaponova ◽  
Bogdan Sarzhanov
Keyword(s):  
Wear Resistance ◽  
Protective Coatings ◽  
Construction Materials ◽  
Thick Layer ◽  
Environmentally Friendly ◽  
Functional Coatings ◽  
Surface Layers ◽  
Resource Saving ◽  
Essential Components ◽  
Hydroabrasive Wear

The work presented in this paper is devoted to the formation of thick-layer wear-resistant coatings by technologies based on electrospark alloying, an example of essential components hardening for the heavy-duty processing equipment operating under hydroabrasive wear conditions. The aim of the paper is to improve the manufacturing and repairing technologies for the helical surfaces of the screws made of 65Г, 30X13 and 40X steels and corrosion-resistant stainless steel 12X18H10T. The above aim has been achieved owing to applying the new environmentally friendly technologies for the formation of the surface layers, and also due to the choice of the surface layers that are most resistant against hydroabrasive wear, which choice being provided for by conducting the comparative tests on the samples made of the above said steel grades and strengthened in various ways. The analysis results of the hydroabrasive wear resistance of the samples made of steel and provided with protective coatings is presented.

How Third-Body Processes Affect Friction and Wear

MRS Bulletin ◽  
1998 ◽  
Vol 23 (6) ◽  
pp. 37-40 ◽  
Author(s):  
Irwin L. Singer
Keyword(s):  
Wear Resistance ◽  
Shear Strength ◽  
Friction And Wear ◽  
High Hardness ◽  
Rolling Contact ◽  
Sliding Contact ◽  
Third Body ◽  
Talcum Powder ◽  
Great Cost ◽  
Wear Resistant

Materials designed for rolling or sliding contact, like corrosion-resistant materials, can provide great cost savings to industry. So why can't such “tribomaterials” be designed based on materials properties that control friction and wear? In recent years, it has become clear that the properties we need to understand are not only those of the starting materials—whether bulk solids or engineered surfaces—but also those of the materials generated within the sliding (or rolling) contact, the so-called “third-body” materials. This article reviews third-body processes and their role in controlling friction and wear of practical surface treatments.It may seem odd that properties like slipperiness and wear resistance can be easily described but are not scientifically understood. We can feel that polytetrafluoroethylene is slippery but know that it is not very wear-resistant because we can scratch it with a fork. We can sense low friction when we rub talcum powder between our fingers but know it cannot lubricate indefinitely because it gets ejected as we rub. Is it contradictory to ask for materials that are both slippery and wear-resistant? Slipperiness is associated with low shear strength whereas wear resistance is modeled on high hardness—that is, high shear strength. Before we can answer this seeming contradiction, it is useful to review some aspects of friction and wear.More than 50 years ago, Bowden and Tabor explained how a low shearstrength film can reduce the friction coefficient between two higher shearstrength materials in sliding contact.

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