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

In this research, an austempering heat treatment was applied on gray cast iron using various austempering temperatures ranging from 232 °C to 371 °C and holding times ranging from 1 min to 120 min. The microstructure and hardness were examined using optical microscopy and a Rockwell hardness tester. Rotational ball-on-disk sliding wear tests were carried out to investigate the wear behavior of austempered gray cast iron samples and to compare with conventional quenched and tempered gray cast iron samples under equivalent hardness. For the austempered samples, it was found that acicular ferrite and carbon saturated austenite were formed in the matrix. The ferritic platelets became coarse when increasing the austempering temperature or extending the holding time. Hardness decreased due to a decreasing amount of martensite in the matrix. In wear tests, austempered gray cast iron samples showed slightly higher wear resistance than quenched and tempered samples under similar hardness while using the austempering temperatures of 232 °C, 260 °C, 288 °C, and 316 °C and distinctly better wear resistance while using the austempering temperatures of 343 °C and 371 °C. After analyzing the worn surface, abrasive wear and fatigue wear with the presence of pits, spalls, voids, long cracks, and wear debris were the main mechanisms for austempered gray cast iron with a low austempering temperature. However, only small pits and short cracks were observed on the wear track of austempered gray cast iron with high austempering temperature. Furthermore, the graphite flakes were exposed and ground by the counterpart surface during wear tests. Then, the graphite particles would form a tribo-layer to protect the contact surface.

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Improved fatigue wear resistance of gray cast iron by localized laser carburizing

Materials Science and Engineering A ◽

10.1016/j.msea.2015.07.046 ◽

2015 ◽

Vol 644 ◽

pp. 1-9 ◽

Cited By ~ 28

Author(s):

Zhi-kai Chen ◽

Ti Zhou ◽

Ruo-yu Zhao ◽

Hai-feng Zhang ◽

Shu-chao Lu ◽

...

Keyword(s):

Wear Resistance ◽

Cast Iron ◽

Gray Cast Iron ◽

Gray Cast ◽

Fatigue Wear

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

Bulletin of Kharkov National Automobile and Highway University ◽

10.30977/bul.2219-5548.2021.94.0.103 ◽

2021 ◽

pp. 103

Author(s):

Nataliia Lalazarova ◽

Оlga Afanasieva ◽

Olena Popova ◽

Oleksiy Dmytrenko

Keyword(s):

Wear Resistance ◽

Cast Iron ◽

High Frequency ◽

Gray Cast Iron ◽

Operating Time ◽

Hardened Layer ◽

Gray Cast ◽

Centrifugal Pumps ◽

Surface Quenching ◽

Surface Induction

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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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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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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