Abrasive and erosive wear of technical materials

Operating reliability of agricultural, transport and construction machines is in a considerable degree influenced by corrosion and wear. These sorts of damage significantly influence the costs for the restoration of mechanical components, as well as their service and repairs. This article deals with comparing the abrasive and erosive wear of technical materials (soft steel, wear-resisting steel, ledeburitic cast-iron, cemented carbides). A test of the abrasive wear by means of bound particles was carried out on an apparatus with a corundum abrasive cloth. The erosive wear was made in a testing mechanism manufactured by the firm Kovo Staněk Ltd., which simulated the operating conditions by jetting with both spheroidal granulate and angular crushed material. The comparative resistance against the abrasive wear of the tested materials varied by three degrees. The testing conditions and the working means affected not only the wear formulated in absoulute units (g, mm3), but also the proportional resistance against the wear, which could be changed by a degree. According to these results, appropriate materials for the inside lining of the working chambre and for the casting wheel paddles of the jetting appliance could be found.

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Analysis of the Structure and Abrasive Wear Resistance of White Cast Iron with Precipitates of Carbides

Archives of Metallurgy and Materials ◽

10.2478/amm-2013-0113 ◽

2013 ◽

Vol 58 (3) ◽

pp. 973-976 ◽

Cited By ~ 9

Author(s):

D. Kopyciński ◽

M. Kawalec ◽

A. Szczęsny ◽

R. Gilewski ◽

S. Piasny

Keyword(s):

Wear Resistance ◽

Cast Iron ◽

Abrasive Wear ◽

Metal Matrix ◽

White Cast Iron ◽

Abrasive Wear Resistance ◽

Operating Conditions ◽

Metallographic Analysis ◽

Abrasive Hardness ◽

Resistance Tests

Abstract The resistance of castings to abrasive wear depends on the cast iron abrasive hardness ratio. It has been anticipated that the white cast iron structure will be changed by changing the type of metal matrix and the type of carbides present in this matrix, which will greatly expand the application area of castings under the harsh operating conditions of abrasive wear. Detailed metallographic analysis was carried out to see the structure obtained in selected types of white cast iron, i.e. with additions of chromium and vanadium. The study compares the results of abrasive wear resistance tests performed on the examined types of cast iron.

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Usability of Boron as an Alloying Element in Gray Cast Iron Rollers and its Effect to Abrasive Wear Behaviour

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.445.331 ◽

2012 ◽

Vol 445 ◽

pp. 331-336

Author(s):

Cemal Meran ◽

Mehmet Yuksel

Keyword(s):

Cast Iron ◽

Wear Rate ◽

Abrasive Wear ◽

Gray Cast Iron ◽

Operating Conditions ◽

Gray Cast ◽

Wear Behaviour ◽

Sliding Speed ◽

Abrasive Wear Behaviour ◽

Wear Tests

In this study, usability of boron as an alloy element in gray cast iron and its effect to abrasive wear behaviour were investigated. Pin-on-drum wear tests at the room temperature carried out for seven low nickels alloyed gray cast irons with different boron addition. The mass losses, hardness values and microstructures for gray cast iron specimens with different boron alloyed were investigated for determining wear behaviour. The pin for the wear tests was manufactured from X210Cr12 cold work tool steel with material number of 1.2080. Abrasive pin-on-drum wear tests were carried out at a 165 N constant load and two different sliding speeds that are closely related to the appropriate operating conditions in rolling mills. The experimental studies have shown that wear rate decrease with increasing boron amount in chemical composition of the alloy and the wear rate at high sliding speed has decreased more rapidly than the rate at the low sliding speed with increasing boron amount.

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The Abrasive Wear Resistance of Chromium Cast Iron

Archives of Foundry Engineering ◽

10.2478/afe-2014-0015 ◽

2014 ◽

Vol 14 (1) ◽

pp. 63-66 ◽

Cited By ~ 8

Author(s):

D. Kopyciński ◽

S. Piasny ◽

M. Kawalec ◽

A. Madizhanova

Keyword(s):

Wear Resistance ◽

Cast Iron ◽

Abrasive Wear ◽

Metal Matrix ◽

White Cast Iron ◽

Abrasive Wear Resistance ◽

Operating Conditions ◽

Silica Sand ◽

Chromium Cast Iron ◽

Abrasive Hardness

Abstract The resistance of cast iron to abrasive wear depends on the metal abrasive hardness ratio. For example, hardness of the structural constituents of the cast iron metal matrix is lower than the hardness of ordinary silica sand. Also cementite, the basic component of unalloyed white cast iron, has hardness lower than the hardness of silica. Some resistance to the abrasive effect of the aforementioned silica sand can provide the chromium white cast iron containing in its structure a large amount of (Cr, Fe)7C3 carbides characterised by hardness higher than the hardness of the silica sand in question. In the present study, it has been anticipated that the white cast iron structure will be changed by changing the type of metal matrix and the type of carbides present in this matrix, which will greatly expand the application area of castings under the harsh operating conditions of abrasive wear. Moreover, the study compares the results of abrasive wear resistance tests performed on the examined types of cast iron. Tests of abrasive wear resistance were carried out on a Miller machine. Samples of standard dimensions were exposed to abrasion in a double to-and-fro movement, sliding against the bottom of a trough filled with an aqueous abrasive mixture containing SiC + distilled water. The obtained results of changes in the sample weight were approximated with a power curve and shown further in the study.

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Corrosion Resistance of Selected Cast Iron Grades Under Deposit Mining Conditions

International Journal of Metalcasting ◽

10.1007/s40962-021-00607-6 ◽

2021 ◽

Author(s):

Marcin Stawarz ◽

Malwina Dojka

Keyword(s):

Corrosion Resistance ◽

Cast Iron ◽

Abrasive Wear ◽

Working Conditions ◽

Pitting Corrosion ◽

Mine Working ◽

Laboratory Tests ◽

Gravimetric Method ◽

Operating Conditions ◽

Metallographic Analysis

AbstractThe paper analyzes two types of alloyed cast iron used for pump impellers operated in mine working conditions. The research on corrosion resistance of two cast iron grades resistant to abrasive wear was presented. Tests were performed for chromium cast iron (HCCI) grade EN-GJN HV600 (XCr18) (acc. to EN 12513) and high-silicon cast iron HSCI Grade 1 (acc. to ASTM A 518/ A 518M - 99). Deposit mining is characterized by variable working conditions. Both types of cast iron are resistant to abrasive wear and are suitable for loaded elements (e.g. pump impellers). The paper presents a metallographic analysis of selected cast iron grades based on light microscopy. The chemical composition of the tested cast irons was determined with the Leco GDS 500 spectrometer; C and S content was determined with the CS125 Leco Carbon–Sulfur Determinator. The Si content for HSCI Grade 1 was determined by gravimetric method. Corrosion tests were performed under laboratory conditions. In-service tests of cast impellers were performed under real conditions (working mines applications). Corrosion resistance tests were measured with VoltaLab® Potentiostat (PGP 201). Performed tests resulted in the determination of the usefulness of materials used for dewatering pump impellers in mine working conditions. The results of laboratory tests were verified under the operating conditions of cast impellers. In the conditions of transporting a liquid-solid mixture at the moment of appearance of impurities (e.g. chlorine impurities) in the liquid, the impellers from cast iron HCCI revealed a tendency to pitting corrosion, which explains the exploitation results collected in the mining. After laboratory tests for sample from HCCI, the low value of breakdown potential Eb and repassivation Ecp was concluded which says about the absence of pitting corrosion resistance.

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DESTABILIZATION HEAT TREATMENT EFFECT ON EROSIVE WEAR CHARACTERISTICS OF HIGH CHROMIUM WHITE CAST IRON

Kufa Journal of Engineering ◽

10.30572/2018/kje/090204 ◽

2018 ◽

Vol 09 (02) ◽

pp. 45-56 ◽

Cited By ~ 1

Author(s):

Israa Yousif ◽

◽

Ali Ataiwi ◽

Keyword(s):

Heat Treatment ◽

Cast Iron ◽

Treatment Effect ◽

White Cast Iron ◽

Erosive Wear ◽

High Chromium ◽

Wear Characteristics

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ZA-12

Alloy Digest ◽

10.31399/asm.ad.zn0031 ◽

1977 ◽

Vol 26 (9) ◽

Keyword(s):

Fracture Toughness ◽

Wear Resistance ◽

Shear Strength ◽

Cast Iron ◽

High Strength ◽

Heat Treating ◽

General Purpose ◽

Corrosion And Wear ◽

Aluminum Castings ◽

Moderate Cost

Abstract ZA-12 is a zinc-aluminum-copper foundry alloy recommended for general-purpose castings of high strength at moderate cost. Its properties are similar to those of cast iron; however, it was designed for use in nonferrous foundries to compete with cast-iron, bronze, brass and aluminum castings. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and compressive and shear strength as well as fracture toughness and fatigue. It also includes information on corrosion and wear resistance as well as casting, forming, heat treating, machining, and surface treatment. Filing Code: Zn-31. Producer or source: Eastern Alloys Inc.. See also Alloy Digest Zn-49, May 1990.

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Validation of On-line Respiration Meter and its Applications by Computer Simulation

Water Science & Technology ◽

10.2166/wst.1992.0578 ◽

1992 ◽

Vol 26 (5-6) ◽

pp. 1355-1363 ◽

Cited By ~ 2

Author(s):

C-W. Kim ◽

H. Spanjers ◽

A. Klapwijk

Keyword(s):

Steady State ◽

Activated Sludge ◽

Respiration Rate ◽

Oxygen Demand ◽

Operating Conditions ◽

Mass Balances ◽

Short Term ◽

Respiration Rates ◽

On Line ◽

Made In

An on-line respiration meter is presented to monitor three types of respiration rates of activated sludge and to calculate effluent and influent short term biochemical oxygen demand (BODst) in the continuous activated sludge process. This work is to verify if the calculated BODst is reliable and the assumptions made in the course of developing the proposed procedure were acceptable. A mathematical model and a dynamic simulation program are written for an activated sludge model plant along with the respiration meter based on mass balances of BODst and DO. The simulation results show that the three types of respiration rate reach steady state within 15 minutes under reasonable operating conditions. As long as the respiration rate reaches steady state the proposed procedure calculates the respiration rate that is equal to the simulated. Under constant and dynamic BODst loading, the proposed procedure is capable of calculating the effluent and influent BODst with reasonable accuracy.

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