scholarly journals Selection of the chemical composition of steels and their thermal hardening mode using a computer program

2021 ◽  
pp. 59-65
Author(s):  
D. M. Berdiev ◽  
M. A. Uмаrоvа ◽  
A. A. Yusupov
Keyword(s):  
Wear Resistance ◽  
Chemical Composition ◽  
Computer Program ◽  
Sliding Friction ◽  
Thermal Hardening ◽  
Abrasive Particles ◽  
Density Of Dislocations ◽  
Heat Treated ◽  
Final Tempering ◽  
Selection Of

The relationships between the parameters of the structure of heat‑treated steels and their abrasive wear resistance are established. At all temperatures of the final tempering of hardened steel, there is a direct relationship between its structure parameters (the number of elements in a solid solution, the density of dislocations, the size of cementite particles and the intercementite distance) and wear resistance when sliding friction against loose abrasive particles. A computer program has been developed to select the chemical composition of the steel grade and methods of thermal hardening in order to ensure the required wear resistance.

Determination of the influence of structural parameters of steels on their abrasive wear resistance

2021 ◽  
pp. 50-54
Author(s):  
Keyword(s):  
Heat Treatment ◽  
Wear Resistance ◽  
Computer Program ◽  
Abrasive Wear ◽  
Structural Parameters ◽  
Extreme Temperature ◽  
Abrasive Wear Resistance ◽  
Thermal Hardening ◽  
Heat Treated

Relationships are established between the parameters of the structure of heat-treated steels and their abrasive wear resistance. A computer program is developed for the choice of material and methods of thermal hardening in order to ensure the required wear resistance. Keywords: heat treatment, dislocation density, extreme temperature, lowalloy steel, computer program. [email protected]

Role of Micro- and Nanofillers in Abrasive Wear of Composites Based on Ultra-High Molecular Weight Polyethylene

2014 ◽  
Vol 1040 ◽  
pp. 148-154 ◽  
Author(s):  
Sergey Panin ◽  
Lyudmila А. Kornienko ◽  
Nguyen Xuan Thuc ◽  
Larisa R. Ivanova ◽  
Sergey V. Shilko
Keyword(s):  
Wear Resistance ◽  
Abrasive Wear ◽  
Sliding Friction ◽  
Abrasive Wear Resistance ◽  
Dry Sliding ◽  
Cu Nanoparticles ◽  
Abrasive Particles ◽  
Ultra High Molecular Weight ◽  
Fixed Abrasive

The abrasive wear of pure UHMWPE as well as one filled with nanoand microparticles (fibers) were investigated. It was found that abrasive wear resistance of microcomposites (containing AlO(OH) and Al2O3microparticles) can grow up by 16-18 times in comparison with pure UHMWPE depending on the strength and size of the filler as well as abrasive grit. Nanofillers (AlO(OH) and carbon nanofibers (CNF) as well as SiO2and Cu nanoparticles) as opposed to microfillers can improve abrasive wear resistance of UHMWPE in a significantly less degree (up to 50 %). Abrasive wear resistance of nanocomposites weakly depends on the type of filler and is defined by the polymeric matrix (permolecular) and counter-face abrasive grit. The comparative analysis of the wear mechanisms of UHMWPE based micro-and nanocomposites under abrasive wear (fixed abrasive particles) and dry sliding friction is carried out.

scholarly journals Mathematical model of the mechanical properties of Ti-alloyed hypoeutectic cast iron for mixer blades

2021 ◽  
pp. 99-110
Author(s):  
Sergei Kharchenko ◽  
Andriy Barsuk ◽  
Nurlana Karimova ◽  
Alexander Nanka ◽  
Yevhen Pelypenko ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Mathematical Model ◽  
Wear Resistance ◽  
Cast Iron ◽  
Chemical Composition ◽  
Ultimate Strength ◽  
Abrasion Resistance ◽  
Resistance Coefficient ◽  
Regression Equations ◽  
Selection Of

The object of research is hypoeutectic cast iron intended for cast parts operating under abrasive friction conditions. Such parts are mixer blades, the operational properties of which include durability, assessed by abrasion resistance and strength. To give the blades such properties, cast irons, which are materials of the blades, are alloyed with elements that contribute to the formation of carbides of various compositions. The main problem that impedes the targeted selection of materials for mixer blades or finished blades from different materials or different chemical composition is the lack of substantiated selection criteria. If the shipment is carried out only with the provision of data on the chemical composition of the alloy, it is necessary to be able to evaluate the expected mechanical properties, in particular abrasion resistance and strength. Using the methods of regression analysis, a mathematical model has been obtained that includes two regression equations, which allows for a targeted selection of the chemical composition that provides the maximum possible value of mechanical properties – ultimate strength and coefficient of wear resistance. Optimization of the chemical composition, carried out according to this model, made it possible to determine the following chemical composition: C=2.94 %, Ceq=3.3 %, Ti=1.56 %, providing the maximum ultimate strength σb=391 MPa; C=2.78 %, Ceq=3.14 %, Ti=1.61 %, providing a maximum wear resistance coefficient Kwr=12 %. In the case of priority of the strength criterion, the calculated optimal chemical composition makes it possible to reduce the mass-dimensional characteristics of the mixing units of the mixers. A procedure is proposed for using this model to select a batch of blades with the expected best performance properties

scholarly journals Design and technological provision of wear resistance of elastomer surface of rubber-cord casings of damping devices

2021 ◽  
pp. 25-28
Author(s):  
V. G. Churankin ◽  
◽  
A. V. Lyamtsev ◽  
V. V. Derkach ◽  
◽  
...  
Keyword(s):  
Wear Resistance ◽  
Chemical Composition ◽  
Shock Absorber ◽  
Sliding Friction ◽  
Rolling Friction ◽  
Solid Base ◽  
Cover Layer ◽  
Deformation Component ◽  
Main Factors ◽  
Pneumatic Shock

Two main factors are considered that determining the friction between non-lubricated surfaces of an elastomer and a solid base during their relative motion. The first one is adhesion in the areas of real (actual) catalysis and the second factor is the deformation component, which is due to the delay of recovery of the elastomer after the irregularity is introduced and it is called the hysteresis component of friction. One of the main problems of increasing the resource of pneumatic dampers is minimizing the wear of the covering layer of the rubber-cord casing (RCC). The wear of the RCC is due to the fact that sliding friction occurs in the process of contact between the metal surface and the surface of the RCC, as a result of which the cover layer of the RCC (in some cases with the first cord layer) wears out, depending on the chemical composition of the rubber and the features of the operation of the pneumatic shock absorber. In order to minimize the wear of rubber, it is proposed to change the design of the pneumatic damper so that rolling friction dominates in the contact between the surfaces of rubber and metal

Research on the Microstructure and Wear Resistance of Hardfacing Layer on Big Cold Trimming Die Insert

2011 ◽  
Vol 189-193 ◽  
pp. 834-837
Author(s):  
Jian Ping Shi ◽  
Bo Lin He ◽  
Ying Xia Yu ◽  
Jing Liu
Keyword(s):  
Wear Resistance ◽  
Cast Iron ◽  
Chemical Composition ◽  
Service Life ◽  
Wear Mechanism ◽  
Micro Hardness ◽  
Wear Model ◽  
Heat Treated ◽  
Traditional Process ◽  
Simple Technology

It’s a simple technology to manufacture big trimming die by hardfacing on the die insert of cast iron. Here, the chemical composition, microstructure, micro-hardness, wear resistance and wear mechanism of the hardfacing layer with a newly developed electrode have been studied. The experimental results indicate that the hardfacing technology has much more advantages and cheaper than that of traditional process. The chemical composition, microstructure, micro-hardness of the hardfacing metal are all satisfied for manufacturing the big trimming die by welding on die insert of cast iron. The wear resistant test of hardfacing layers were carried out by using M2000 type tester with two different electrodes. The wear resistance of new electrode hardfacing layer is higher than that of normal hardfacing electrode D322. The wear mechanism of hardfacing layer belongs to abrasive wear model. The service life of hardfacing die insert is as long as tool steel insert which was fully heat-treated. More than 25000 workpieces can be carried out by using the hardfacing die insert. The life of repaired cold die with new kind of hardfacing electrode bar can be raised up to 30~50% than that with the electrode D322 under the same condition.

Wear Resistance of Graphitized Steels

2013 ◽  
Vol 58 (3) ◽  
pp. 813-816 ◽  
Author(s):  
S. Byelikov ◽  
I. Volchok ◽  
I. Akimov
Keyword(s):  
Weight Loss ◽  
Wear Resistance ◽  
Copper Content ◽  
Sliding Friction ◽  
Metal Base ◽  
Factors Affecting ◽  
Heat Treated ◽  
Main Factors ◽  
Object Of Study ◽  
Graphite Inclusions

Abstract Heat-treated graphitized steels with different carbon, silicon and copper contents have been the object of study. The influence of the composition on the structure and wear resistance (weight loss of the specimen) of graphitized steels (after hardening and tempering) under the conditions of metal to metal dry sliding friction with the use of Amsler-type friction machines, has been investigated in this work. Research results have shown that the main factors affecting wear resistance of graphitized steels have been not only their metal base hardness, but the quantity, shape and distribution of graphite inclusions uniformity in the structure of such steels as well. A regression dependence of the quantity of specimen’s weight loss on carbon, silicon and copper content has been obtained in the work. The highest wear resistance was pertained by the steel having the following content: 1.60. . . 1.70%C; 2.20. . . 2.30%Si; 0.80. . . 0.90%Cu; 0.60. . . 0.70%Mn; 0.15. . . 0.18%Cr; 0.22. . . 0.25%Al; up to 0.015%S and 0.024%P.

WEAR RESISTANCE OF STRUCTURAL STEELS AS A RESULT OF BORONISING OPERATIONS

Tribologia ◽  
2018 ◽  
Vol 278 (2) ◽  
pp. 37-44 ◽  
Author(s):  
Elżbieta KALINOWSKA-OZGOWICZ ◽  
Klaudiusz LENIK ◽  
Sylwester KORGA
Keyword(s):  
Wear Resistance ◽  
Chemical Composition ◽  
Sliding Friction ◽  
Isothermal Holding ◽  
Thermochemical Treatment ◽  
Thickness Measurement ◽  
Structural Steels ◽  
Potassium Chromate ◽  
Quench Hardening ◽  
Friction Method

This paper presents the results of investigations on the effect of thermochemical treatment, boronising and chemical composition of selected structural steels on their wear in sliding friction process. The operation of boronising on C45, 37CrNiMo, 42CrMo6, 41Cr4, 50CrSi4-4 steels was performed by powder method at 950°C for 8 h. Following this operation, rod sections of the test steels were subjected to quench hardening from 850°C with isothermal holding at 300°C for 1h. The assessment of the construction, thickness and microhardness of boronised layers depending on the level of carbon and alloying elements in chemical composition of analysed steels was made. The testing for wear resistance of steels after boronising was carried out with the sliding friction method by applying a load of 150 N, counter-sample rotational speed of 1000 rpm and using aqueous solution of potassium chromate as a cooling medium. The metallographic observations of the structure and thickness measurement of the boronised layers were carried out using a light microscope, while the identification of phases was made by the X-ray qualitative analysis method. The hardness and microhardness measurements were taken by the Vickers method.

Wear Resistance of Hypereutectoid Steel Alloyed with Copper and Aluminum

2015 ◽  
Vol 788 ◽  
pp. 274-280
Author(s):  
Natalia Stepanova ◽  
Elena Lozhkina ◽  
Alexey Razumakov ◽  
Anna Losinskaya
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Cast Iron ◽  
Sliding Friction ◽  
Hypereutectoid Steel ◽  
Abrasive Particles ◽  
Relative Wear ◽  
Relative Wear Resistance ◽  
Fixed Abrasive ◽  
Lamellar Pearlite

The structure, mechanical properties and wear resistance of hypereutectoid steel containing 0.09-8.97 wt. %copper were studied. It is found that an increase in copper increases lamellar pearlite microhardness. Triboengineering testings under conditions of sliding friction show that wear resistance of hypereutectoid steel alloyed with 8.97 wt. % copper is ~3.5 times higher than the wear resistance of bronze and by ~23 % higher than the wear resistance of bearing cast iron. Under conditions of friction on fixed abrasive particles a relative wear resistance of the hypereutectoid steel alloyed with copper is ~3 times higher than a relative wear resistance of bronze.

Effect of a Complex Heat Treatment on the Structure of 300M Steel

1981 ◽  
Vol 39 ◽  
pp. 312-313
Author(s):  
R. Padmanabhan ◽  
W. E. Wood
Keyword(s):  
Heat Treatment ◽  
Metal Carbides ◽  
Austenite Grain Size ◽  
300M Steel ◽  
Heat Treated ◽  
Strain Fracture ◽  
Prior Austenite Grain Size ◽  
Short Time ◽  
Final Tempering ◽  
Similar Yield

Intermediate high temperature tempering prior to subsequent reaustenitization has been shown to double the plane strain fracture toughness as compared to conventionally heat treated UHSLA steels, at similar yield strength levels. The precipitation (during tempering) of metal carbides and their subsequent partial redissolution and refinement (during reaustenitization), in addition to the reduction in the prior austenite grain size during the cycling operation have all been suggested to contribute to the observed improvement in the mechanical properties. In this investigation, 300M steel was initially austenitized at 1143°K and then subjected to intermediate tempering at 923°K for 1 hr. before reaustenitizing at 1123°K for a short time and final tempering at 583°K. The changes in the microstructure responsible for the improvement in the properties have been studied and compared with conventionally heat treated steel. Fig. 1 shows interlath films of retained austenite produced during conventionally heat treatment.

KAISER ALUMINUM ALLOY 4026

Alloy Digest ◽  
2003 ◽  
Vol 52 (10) ◽  
Keyword(s):  
Wear Resistance ◽  
Aluminum Alloy ◽  
Physical Properties ◽  
Tensile Properties ◽  
Sliding Friction ◽  
High Strength ◽  
Heat Treating ◽  
Kaiser Aluminum ◽  
Friction Resistance

Abstract Kaiser Aluminum alloy 4026 has high strength and good wear resistance, as well as galling resistance. It was developed for sliding friction resistance. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on heat treating. Filing Code: AL-385. Producer or source: Tennalum, A Division of Kaiser Aluminum.

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