Increasing wear resistance of the protective sleeve of the centrifugal pump made of gray cast iron by surface hardening

One of the weak spots that reduce the guaranteed operating time of centrifugal pumps is the assembly that includes the seal and protective sleeves. The main purpose of the bushings in the rotor kit is to protect the shaft from corrosion, erosion and wear. The sleeve operates under abrasive wear conditions by packing elements and abrasive particles that get into the liquid pumped by the pump. The protective sleeves made of gray cast iron do not meet the service life in connection with accelerated surface wear. Goal. The purpose of the work is to ensure high wear resistance of cast iron pump parts by heat treatment. Method. The chemical composition was determined on a portable laser analyzer Laser Z200 C +. The structure was studied using an optical microscope. The wear was investigated by the roller-block method on a friction machine. Surface quenching was carried out with a high-frequency lamp generator in a single-turn inductor. Results. The microstructure of gray cast iron as cast consists of pearlite, ferite, double phosphide eutectic and inclusions of lamellar graphite. Microhardness of small-lamellar pearlite is Н50 = 1550–2220 MPa, microhardness of phosphide eutectic is Н50 = 6500–8000 MPa. Surface induction quenching by high-frequency currents followed by low tempering is an effective way to increase the wear resistance of cast iron products of small cross-section and does not cause warping. Cast iron for surface quenching should have a pearlite structure, and graphite should be contained in the form of small inclusions. The optimal heating temperature for induction hardening was determined as 900 °С, which made it possible to obtain the microstructure of the hardened layer – martensite, double phosphide eutectic and graphite. Scientific novelty. The developed modes of surface quenching make it possible to preserve a double phosphide eutectic in the structure of the surface layer, which makes it possible to obtain high hardness and wear resistance of the hardened layer. Practical significance. Surface induction quenching with low tempering of cast gray iron increased its wear resistance by 2,4 times. The previous normalization had practically no effect on the durability of cast iron, since its structure contains less than 10% ferrite.

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Experimental Methods for NiCrBSi-WC Cladding on Gray Cast Iron Trim Cutter Die

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.761.298 ◽

2015 ◽

Vol 761 ◽

pp. 298-302

Author(s):

N.I.S. Hussein ◽

S.R. Kamarul ◽

Mohamad Nizam Ayof

Keyword(s):

Wear Resistance ◽

Cast Iron ◽

Gray Cast Iron ◽

Rejection Rate ◽

Cutting Edge ◽

Gray Cast ◽

Filler Material ◽

Burr Formation ◽

Resistant Material ◽

Wear Resistant

The wear on the cutting edge of the gray cast iron trim cutter die will result in the burr formation on the trimmed blanks. This will increase the rejection rate, and hence, decreasing the efficiency of the production. By applying a wear resistant material, the wear rate on the cutting edge of the die is believed to be minimized. In this paper, the methodology of the experiment on the cladding process using gas metal arc as the heat source, and NiCrBSi-WC as the filler material on gray cast iron substrate is presented. NiCrBSi-WC is chosen as the filler material because of its outstanding wear resistance characteristic. Furthermore, it is a popular choice as a wear resistant material in various types of industry. The purpose of the planned experiment is to maximize the wear resistance of the trim cutting die. It is also a fraction of the case study based on the parts production in the automotive industry in Malaysia.

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Influence of Orientations of Bionic Unit Fabricated by Laser Remelting on Fatigue Wear Resistance of Gray Cast Iron

Journal of Materials Engineering and Performance ◽

10.1007/s11665-015-1499-9 ◽

2015 ◽

Vol 24 (6) ◽

pp. 2511-2520 ◽

Cited By ~ 9

Author(s):

Zhi-Kai Chen ◽

Ti Zhou ◽

Hai-feng Zhang ◽

Wan-shi Yang ◽

Hong Zhou

Keyword(s):

Wear Resistance ◽

Cast Iron ◽

Gray Cast Iron ◽

Gray Cast ◽

Laser Remelting ◽

Fatigue Wear

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Microstructure and tribological properties of gray cast iron specimens coated by aluminizing, boronizing, chromizing and siliconizing

MRS Proceedings ◽

10.1557/opl.2012.1726 ◽

2012 ◽

Vol 1516 ◽

pp. 115-120 ◽

Cited By ~ 2

Author(s):

T. Murakami ◽

K. Matsuzaki ◽

Y. Gomi ◽

S. Sasaki ◽

H. Inui

Keyword(s):

Wear Resistance ◽

Cast Iron ◽

Tribological Properties ◽

Gray Cast Iron ◽

Steel Ball ◽

Gray Cast ◽

Iron Plate ◽

Aisi 52100 ◽

Alpha Olefin ◽

Aisi 52100 Steel

ABSTRACTIn this study, aluminized, boronized, chromized and siliconized gray cast iron plate specimens were prepared, and their microstructures and tribological properties were investigated. The surfaces of the aluminized, boronized, chromized and siliconized specimens mainly consisted of FeAl, Fe2B, (Cr, Fe)23C6 and FeSi phases, respectively. Also, the surface of the boronized specimen exhibited the highest microvickers hardness of all the specimens. The aluminized, boronized and chromized specimens exhibited friction coefficients as low as the non-coated specimens when sliding against AISI 52100 steel ball specimens in poly-alpha-olefin. In addition, the boronized and chromized specimens exhibited much higher wear resistance than the non-coated specimens.

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Effect of silicon carbide modifiers on the physical-mechanical properties of gray cast iron and cast iron with spheroidal graphite

MATEC Web of Conferences ◽

10.1051/matecconf/202134001006 ◽

2021 ◽

Vol 340 ◽

pp. 01006

Author(s):

Vladimir A. Poluboyarov ◽

Anatoliy N. Cherepanov ◽

Viktor A. Kuznetsov ◽

Zoya A. Korotaeva ◽

Alexander A. Zhdanok

Keyword(s):

Mechanical Properties ◽

Silicon Carbide ◽

Wear Resistance ◽

Cast Iron ◽

Gray Cast Iron ◽

Term Treatment ◽

Gray Cast ◽

Spheroidal Graphite ◽

Short Term Treatment ◽

Maximal Increase

The influence of mechanochemically produced modifiers on the properties of cast iron at out-of-furnace modification has been studied. Short-term treatment in mechanochemical activators makes it possible to produce composite modifiers, which are wetted with iron melts, are uniformly distributed therein and effectively influence the crystallization processes. The effect of a modifier based on silicon carbide and chromium (as a protector metal) on the physical-mechanical properties of gray cast-iron and cast-iron with spheroidal graphite is considered. The introduction of SiC in the amount of 0.01-0.1 wt.% into gray cast iron causes the formation of mainly perlitic structure and, as a consequence, an increase in strength, hardness and wear resistance. For SiC content 0.1 wt.%, the tensile strength of GG-15 samples increased by 22.7%, GG-25 by 8%. The maximal increase in the hardness is observed for SiC concentration: for GG-15 – 0.1, for GG-25 – 0.01 wt.%. The GG-25 sample with 0.1 wt.% SiC exhibited the highest wear resistance. The introduction of SiC (0.01 – 0.1 wt.%) into cast iron with spheroidal graphite causes an increase in ferrite content, which promotes a substantial increase in impact viscosity and wear resistance (the highest wear resistance is observed with the introduction of 0.05 wt.% SiC).

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Effects of quench-tempering and laser hardening treatment on wear resistance of gray cast iron

Journal of Materials Research and Technology ◽

10.1016/j.jmrt.2020.05.006 ◽

2020 ◽

Vol 9 (4) ◽

pp. 8163-8171 ◽

Cited By ~ 2

Author(s):

Bingxu Wang ◽

Yuming Pan ◽

Yu Liu ◽

Na Lyu ◽

Gary C. Barber ◽

...

Keyword(s):

Wear Resistance ◽

Cast Iron ◽

Gray Cast Iron ◽

Laser Hardening ◽

Gray Cast ◽

Hardening Treatment

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Numerical Simulation and Experimental Verification of Ultra-High Frequency Induction Cladding with Metal Wire

Materials Science Forum ◽

10.4028/www.scientific.net/msf.975.25 ◽

2020 ◽

Vol 975 ◽

pp. 25-30

Author(s):

Zhen Fei Bing ◽

Yong Jun Shi ◽

Rui Sun ◽

Yan Kuo Guo

Keyword(s):

Cast Iron ◽

Numerical Model ◽

High Frequency ◽

Gray Cast Iron ◽

Steel Wire ◽

Metal Wire ◽

Gray Cast ◽

Ultra High Frequency ◽

Heating Efficiency ◽

High Frequency Induction

This paper proposes a novel approach of ultra-high frequency induction cladding with metal wire, in which AISI type 316L stainless steel wire (SS316L) is coated on gray cast iron to improve the specific surface properties of gray cast iron. The corresponding numerical model coupled with electromagnetic field and temperature field has been developed to obtain the representative distribution of induction heat. The established numerical model has been validated experimentally, and the temperature distribution captured in experiment shows good agreement with the calculated results. Given the high heating efficiency and selective heating characteristics of ultra-high frequency induction cladding technology, this method can be applied to the micro-crack repair on the surface of the thermal-sensitive materials.

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DURA-BAR G2

Alloy Digest ◽

10.31399/asm.ad.ci0065 ◽

2020 ◽

Vol 69 (1) ◽

Keyword(s):

Wear Resistance ◽

Cast Iron ◽

Physical Properties ◽

Tensile Properties ◽

Gray Cast Iron ◽

Vibration Damping ◽

Gray Cast ◽

Damping Properties ◽

Continuous Cast ◽

Cast Products

Abstract Dura-Bar G2 is a gray cast iron bar is used for continuous cast products. It is a good fit for a variety of applications due to its good machinability, wear resistance, and vibration damping properties. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on machining. Filing Code: CI-65. Producer or source: Charter Dura-Bar, Inc.

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Effect of the structure and hardness of gray cast iron on its wear resistance

Chemical and Petroleum Engineering ◽

10.1007/bf01235571 ◽

1970 ◽

Vol 6 (6) ◽

pp. 515-517

Author(s):

V. V. Spasskii ◽

I. V. Patalakha ◽

P. D. Kurochkin ◽

A. A. Chernyi

Keyword(s):

Wear Resistance ◽

Cast Iron ◽

Gray Cast Iron ◽

Gray Cast

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Revealing the technological modes range for ultrasonic surface hardening of cast iron

MATEC Web of Conferences ◽

10.1051/matecconf/201822403001 ◽

2018 ◽

Vol 224 ◽

pp. 03001

Author(s):

Yulia Semenova ◽

Yuri Nikitin ◽

Andrey Rakhimyanov

Keyword(s):

Mathematical Modeling ◽

Cast Iron ◽

Surface Hardening ◽

Gray Cast Iron ◽

Hardened Layer ◽

Maximum Intensity ◽

Gray Cast ◽

Processing Conditions

Prospects of using the ultrasonic surface hardening of different materials as a way of achieving a simultaneous strengthening and finishing effects are presented. It is shown that this method is applicable for non-rigid and brittle parts. Thus, it allows processing gray cast iron. Therefore, the paper is devoted to establishing technologically significant parameters of ultrasonic surface hardening of particular gray cast iron. Research was conducted using mathematical modeling of the process. According to the calculations, the application of the modes revealed makes it possible to achieve the depth of the hardened layer up to 2 mm. Moreover, the parameters of the hardened layer, such as the diameter of a single imprint and the maximum intensity of deformation for specified processing conditions are calculated.

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