scholarly journals Abrasive Wear Properties of Fe-Based Alloys Designed for Mining Applications

2017 ◽  
Vol 62 (3) ◽  
pp. 1521-1534 ◽  
Author(s):  
A. N. Wieczorek ◽  
D. Myszka
Keyword(s):  
Abrasive Wear ◽  
Cast Steel ◽  
Volume Loss ◽  
Wear Properties ◽  
Abrasive Material ◽  
Initial Hardness ◽  
Loss Of Mass ◽  
The Impact ◽  
Quenching And Tempering ◽  
Wear Tests

AbstractThe purpose of this study was to determine experimentally the wear properties of 5 groups of iron-based alloys used in the mining and transport machines exposed to the action of a hard abrasive material. The groups of materials to be examined included austempered ductile irons (ADI), steels and cast steel designed for quenching and tempering and for surface hardening, hard-wearing hardened steels and structural steels. The wear tests were carried out on a disc-on-disc test rig. The test samples were examined under conditions of sliding mating, while the leading destructive process was microcutting of the surface with loose corundum grain. The loss of mass of the examined samples was measured as a parameter characterizing the wear. Base on it, other wear coefficients were determined, for example the volume loss, the intensity of wear and the wear rate. The volume loss values determined were presented as a function of the strength and the initial hardness. Based on the results obtained, it was found that the hardened steel and ADI had comparable wear properties, while the ADI surface was strengthened probably as a result of the transition of austenite into martensite and the impact of the deformation of the graphite contained in ADI on the abrasive wear of the surface.

scholarly journals Operation-Oriented Studies on Wear Properties of Surface-Hardened Alloy Cast Steels Used in Mining in the Conditions of the Combined Action of Dynamic Forces and an Abrasive Material

2017 ◽  
Vol 62 (4) ◽  
pp. 2381-2389 ◽  
Author(s):  
A.N. Wieczorek
Keyword(s):  
Abrasive Wear ◽  
Shot Peening ◽  
Cast Steel ◽  
Operating Conditions ◽  
Dynamic Force ◽  
Cast Steels ◽  
Dynamic Forces ◽  
Combined Action ◽  
The Impact ◽  
Wear Tests

Abstract This paper presents the results of wear tests of shot-peened and not shot-peened cast steels used in the mining machinery industry, in particular in the construction of chain drums for armoured face conveyors. Wear tests were carried out in the conditions corresponding to the real operating conditions of armoured face conveyors during drifting work in rocks such as sandstone. The operating factors subjected to the analyses included the presence of quartz abrasive and the impact of external dynamic forces. On the basis of the wear tests as well as the microhardness and microstructure examinations performed, it has been found that the action of an additional dynamic force has a synergistic impact on the process of abrasive wear in loose quartz abrasive. It has been further found that the value of abrasive wear of chain wheels operated in the conditions of a combined action of abrasive and a dynamic force depends on whether the area of mating of wheels with the chain was shot-peened or not before the wear tests – an increase in the abrasive wear was observed for the wheels made of cast steel subjected to shot peening in the area of mating with the chain. Lower resistance to abrasive wear of the cast steels subjected to shot peening before the wear tests could result from the formation of cracks in the surface layer caused by the action of shot.

scholarly journals Effect of Mo Concentration on the Microstructure Evolution and Properties of High Boron Cast Steel

Materials ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 975
Author(s):  
Zhiguo Chen ◽  
Sen Miao ◽  
Lingnan Kong ◽  
Xiang Wei ◽  
Feihong Zhang ◽  
...  
Keyword(s):  
Impact Toughness ◽  
Abrasive Wear ◽  
Microstructure Evolution ◽  
Cast Steel ◽  
Fish Bone ◽  
Solid Solution Strengthening ◽  
High Boron ◽  
Mo Content ◽  
High Boron Cast Steel ◽  
The Impact

The microstructure evolution, mechanical properties, and tribological properties of high boron cast steel (HBCS) with various Mo concentrations are investigated. The results indicate that Mo addition can significantly modify the microstructure and enhance the comprehensive properties. With the increase of Mo concentration, borides change from the original fish-bone Fe-rich and Cr-rich M2B to dendritic Fe-rich M2B, blocky and cluster-like Cr-rich M2B, and grainy Mo-rich M2B. The hardness of HBCS increases gradually with the increase of Mo content due to the solid solution strengthening and the refinement of M2B. It can be found that all the samples exhibit quasi-cleavage, but the impact toughness increases firstly and reaches the maximum value when the concentration of Mo is 2.10 wt.%, which is the result of the dispersive distribution of M2B rather than the original fish-bone M2B. Subsequently, the impact toughness begins to decrease as the concentration of Mo further increases because of the extensive formation of grainy Mo-rich M2B at the grain boundary. Meanwhile, the wear results reveal that the average friction coefficient and wear ratio decrease with the increase of Mo content, and the wear mechanism changes from abrasive wear and adhesive wear to abrasive wear when the concentration of Mo exceeds 2.10 wt.%.

scholarly journals Effect of impact energy on wear behavior of high chromium white iron produced by liquid die forging

2018 ◽  
Vol 207 ◽  
pp. 03011
Author(s):  
B Qiu ◽  
S M Xing ◽  
Q Dong ◽  
H Liu
Keyword(s):  
Abrasive Wear ◽  
Impact Energy ◽  
Wear Behavior ◽  
Testing Machine ◽  
Wear Testing ◽  
Volume Loss ◽  
White Iron ◽  
High Chromium ◽  
Die Forging ◽  
The Impact

Impact abrasive wear behavior of high chromium white iron (HCWI) produced by liquid die forging process were investigated. the wear tests were performed with the MLD-10 abrasive wear testing machine, using SiO2 abrasive and with four impact energies of 1.5 J, 2.5 J, 3.5 J and 4.5 J for 120 min. The results indicated that the cumulative volume loss of HCWI sample increases with the growth of impact energy, and exhibits best wear resistance under low impact condition. For given impact energy, the volume loss increases with the increasing of wear time, which shown an approximately liner tendency. The macro-morphologies, SEM images of worn surface and cross-sectional images of wear samples were observed by optical microscope and SEM, and the wear mechanism and characteristics were analyzed. Results shown that the wear characteristics is mainly based on the shallow ploughing and accompanied by plastic deformation under lower impact energy, while the fatigue peeling and embedded abrasive become the most significant characteristics when the impact energy is higher.

Microstructure and Heat Treatment of Hot Work Tool Steel: Influence on Mechanical Properties and Wear Behaviour

2018 ◽  
Vol 767 ◽  
pp. 196-203 ◽  
Author(s):  
Božo Skela ◽  
Marko Sedlaček ◽  
Bojan Podgornik
Keyword(s):  
Tensile Strength ◽  
Impact Toughness ◽  
Abrasive Wear ◽  
Tool Steel ◽  
Wear Behaviour ◽  
Wear Properties ◽  
Tempering Temperature ◽  
Hot Work Tool Steel ◽  
Heat Treated ◽  
Wear Tests

Good mechanical and wear properties of hot-work tool steels are needed for tools to withstand severe service conditions during their operational lifetime. Thus, the aim of this investigation was to correlate mechanical and wear properties with changes in microstructure of commercially available hot work tool steel Sitherm S361R. Hardness, impact toughness, tensile strength and wear tests were performed. Hot-work tool steel was heat treated at austenitizing temperature 1030 °C for 15 min in a horizontal vacuum furnace and gas quenched using nitrogen. One set of samples was investigated in as quenched state. Double tempering of samples was performed after quenching for 2 h at each of chosen temperatures, with first tempering temperature of 500 °C for the whole set of tempered samples. The second tempering was conducted at temperatures from 520 °C to 640 °C with increment of 30 °C for each set of samples. Microstructure of differently heat treated samples showed martensitic matrix, but different fraction and distribution of carbides, consequently influencing hardness, impact toughness, tensile strength, yield strength and wear resistance. Reciprocating sliding wear tests were carried out at room temperature in order to correlate microstructure of differently heat treated hot-work tool steel with wear. In order to achieve adhesive and abrasive wear mechanisms, 100Cr6 and Al2O3 balls were used as counter-body, respectively. Combination of adhesive and abrasive wear was observed for all specimens with different hardness when using 100Cr6 material as a counter body. However, in the case of Al2O3 abrasive wear was found as the prevailing wear mechanism.

EXPERIMENTAL STUDIES ON THE INFLUENCE OF ABRASIVE MATERIALS ON THE WEAR OF HARD-WEARING STEELS

Tribologia ◽  
2018 ◽  
Vol 281 (5) ◽  
pp. 133-141 ◽  
Author(s):  
Andrzej N. WIECZOREK
Keyword(s):  
Experimental Studies ◽  
Structural Steels ◽  
Operating Conditions ◽  
Ring Test ◽  
Test Rig ◽  
Wear Properties ◽  
Aggressive Action ◽  
Low Wear ◽  
Loss Of Mass ◽  
Wear Tests

The paper presents the wear properties of hard-wearing steels and structural steels used in mining and transport machines exposed to the aggressive action of the environment, which have been determined experimentally in the presence of diverse abrasive materials. The wear tests were carried out on a ring-on-ring test rig simulating the operating conditions of elements exposed to abrasive wear. The samples were subjected to tests in conditions of sliding contact, and the main destructive process was micro-cutting of the surface with loose corundum or quartz grain. In the case of the coal abrasive, only slight grinding in of the mating surfaces was observed. The loss of mass in the samples was measured as the parameter characterizing the wear. It was then used to determine the volume loss. Based on the results obtained, it was found that the wear resistance of hard-wearing steels was approximately four times higher as compared to S355J2 structural steel for the corundum and quartz abrasives. In the case of the coal abrasive, there was a relatively low wear for all of the materials examined.

Experimental Studies on Abrasive Wear of Surface-Hardened and Shot Peened Alloy Cast Steels

2016 ◽  
Vol 674 ◽  
pp. 201-206
Author(s):  
Andrzej Norbert Wieczorek
Keyword(s):  
Abrasive Wear ◽  
Cast Steel ◽  
Experimental Studies ◽  
Operating Conditions ◽  
Linear Wear ◽  
Plastic Properties ◽  
Cast Steels ◽  
Wear Tests ◽  
Alloy Cast

The paper presents the results of wear tests of shot-peened and non-shot-peened cast steels with the use of an especially designed test rig simulating real operating conditions of chain wheels. The chain wheels subjected to tests were operated with the use of loose quartz abrasive. The studies involved the determination of strength and plastic properties, hardness distributions, microstructure and linear wear of the selected cast steels. Based on the results obtained, the following was found: the abrasive wear of cast steel chain wheels increased after shot peening.

scholarly journals Influence of Shot Peening on Abrasion Wear in Real Conditions of Ni-Cu-Ausferritic Ductile Iron

2016 ◽  
Vol 61 (4) ◽  
pp. 1985-1990
Author(s):  
A. N. Wieczorek
Keyword(s):  
Surface Layer ◽  
Abrasive Wear ◽  
Ductile Iron ◽  
Shot Peening ◽  
Residual Austenite ◽  
Wear Properties ◽  
Surface Layers ◽  
Cast Irons ◽  
Dynamic Surface ◽  
The Impact

Abstract The paper presents results of the wear tests of chain wheels made of austempered ductile iron with various content of residual austenite. The aim of this study was to demonstrate the impact of the dynamic surface treatment (shot peening) on wear properties of surface layers of the chain wheels tested that were subjected to the action of quartz abrasive. Apart from determining the value of the abrasive wear, examinations of the magnetic phase content in the microstructure were carried out and plots of hardness of the surface layer as a function of the distance from the surface and microstructure of the materials were prepared. Based on the results, the following was found: an increase in the abrasive wear and a reduction in the hardness of the surface layer of chain wheels subjected to shot peening, as well as reduction of susceptibility to negative action of the shot for cast irons with the structure of upper ausferrite.

Benefit of a Surface Nanocrystallization Treatment on Co28Cr6Mo Abrasive Wear Properties

2014 ◽  
Vol 966-967 ◽  
pp. 435-441 ◽  
Author(s):  
Clémence Demangel ◽  
A. Poznanski ◽  
V. Steenhout ◽  
Alexandra Levesque ◽  
Hicham Benhayoune ◽  
...  
Keyword(s):  
Abrasive Wear ◽  
Processing Parameters ◽  
Surface Mechanical Attrition Treatment ◽  
Knee Prostheses ◽  
Scratch Testing ◽  
Wear Properties ◽  
Surface Polishing ◽  
Mechanical Attrition ◽  
Wear Mode ◽  
The Impact

In this work, the use of a nanocrystallization surface treatment is considered on a cobalt based alloy. Since the Co28Cr6Mo is widely used as an articular bearing surface for artificial joints like hip and knee prostheses, the improvement of its tribological properties is a matter of concern to extend the lifespan of implants. By means of SMA (Surface Mechanical Attrition) treatment, a nanostructured layer is formed at the surface of a CoCrMo alloy establishing an optimized hardness gradient down to a depth of a few hundred of microns. Different treatment times (5, 15 and 25 minutes) are assessed comparatively and several surface polishing methods are studied: with clothes, brushes and a liquid filled with abrasive particles. The influence of processing parameters is discussed regarding hardness and topography. Moreover, the impact of surface modification is examined in terms of wear strengthening through scratch testing. The use of increasing loads mode gives some evidence of the benefit of SMAT. A significant decrease of penetration depth is noticed, from 30% to 60% on average. A straight correlation is also noticed depending on the surface finish method. This study illustrates both the ability of micro scratch testing to assess comparatively treated surface layer and to highlight the benefit of SMAT for wear strengthening in an abrasive wear mode.

The Effect of Ar+ Ion Implantation on the Impact-Abrasive Wear Property of Cu-Polyimide System

1988 ◽  
Vol 119 ◽  
Author(s):  
S. K. Koh ◽  
K. D. Pae
Keyword(s):  
Ion Implantation ◽  
Abrasive Wear ◽  
Optical Microscope ◽  
Wear Property ◽  
X Ray Diffraction ◽  
Wear Properties ◽  
X Ray ◽  
Cu Film ◽  
Pi System ◽  
The Impact

AbstractA thin Cu film(400 Å) was deposited on a smooth polyimide(PI) substrate. Ar+ ion implantation onto the Cu/PI film has been shown to mix Cu and PI and to modify the impact-abrasive wear property. Ar+ ions with energies of 200 keV, and dosage between 1015 to 4×1016 ions/cm2 were used. The surface analyses were carried out with RBS, X-ray and Optical Microscope. The wear properties of the Cu-PI system were determined by a newly constructed Impact-Abrasive Wear Tester. An X-ray diffraction study shows an increase in Cu( 111 )peak with Ar+ ion dosage. The wear property was found to be a function of ion energy, ion dosage, crystallinity of Cu, the amount of mixing of Cu and PI, and the damage of PI substrate due to ion implantation.

scholarly journals Cyanide in salt bath Applied to ASTM A-517 Steel: Effects on Hardness, Wear and Microstructure

2020 ◽  
Vol 9 (3) ◽  
pp. 571-580
Keyword(s):  
Abrasive Wear ◽  
Elevated Temperatures ◽  
Adhesive Wear ◽  
Salt Bath ◽  
Wear Properties ◽  
Soaking Time ◽  
Hardness Tests ◽  
Optimal Values ◽  
Optical Level ◽  
Wear Tests

The effects of the cyanide treatment (CN) in a salt bath at elevated temperatures on the hardness; adhesive and abrasive wear; of ASTM A-517 steel, were investigated. For abrasive wear, 1” x 3” x 5/16" samples were prepared according to ASTM G-65 standard. For adhesive wear, specimens wit ring-shaped: φ ext. = 40 mm, φ int = 20 mm and 10 mm thick, according to ASTM G -77. The CN treatment was carried out, at high temperatures: 800 – 850 – 900 – 950 °C, immersing the samples in a salt bath: 6% NaCN + 80% BaCl2 + 14% NaCl before entering the muffle furnace, with soaking time of 3 hr. Hardness tests were performed on a Rockwell Durometer taking measurements on the HRC scale. The adhesive wear tests were carried out on a parallel lathe coupling the Amsler device, following the ASTM G-77 standard. The abrasive wear tests were performed according to the ASTM G65 standard. Microscopy was done at the optical level. A maximum hardness of 63.5 HRC was found in all samples, representing an increase of 11.3% with respect to the state of supply (T&R). In abrasive wear, its value increased to 66%, compared to supply samples. The most suitable microstructure is presented by cyanide samples at 850ºC, with a layer of compounds (hard layer) formed by: massive cementite; tempered martensite and carbide. It is concluded that when applying cyanide to ASTM A-517 steel, the hardness and wear properties are increased to optimal values, if the cyanide treatment (CN) is carried out at 850 °C.

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