scholarly journals Evaluation of the Microstructure, Tribological Characteristics, and Crack Behavior of a Chromium Carbide Coating Fabricated on Gray Cast Iron by Pulsed-Plasma Deposition

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3400
Author(s):  
Yuliia Chabak ◽  
Vasily Efremenko ◽  
Miroslav Džupon ◽  
Kazumichi Shimizu ◽  
Victor Fedun ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Cast Iron ◽  
Abrasive Wear ◽  
Gray Cast Iron ◽  
Gray Cast ◽  
Dry Sliding Wear ◽  
Dry Sliding ◽  
Pulsed Plasma ◽  
Near Surface ◽  
Heat Treated

The structural and tribological properties of a protective high-chromium coating synthesized on gray cast iron by air pulse-plasma treatments were investigated. The coating was fabricated in an electrothermal axial plasma accelerator equipped with an expandable cathode made of white cast iron (2.3 wt.% C–27.4 wt.% Cr–3.1 wt.% Mn). Optical microscopy, scanning electron microscopy, energy-dispersive spectroscopy, X-ray diffraction analysis, microhardness measurements, and tribological tests were conducted for coating characterizations. It was found that after ten plasma pulses (under a discharge voltage of 4 kV) and post-plasma heat treatment (two hours of holding at 950 °C and oil-quenching), a coating (thickness = 210–250 µm) consisting of 48 vol.% Cr-rich carbides (M7C3, M3C), 48 vol.% martensite, and 4 vol.% retained austenite was formed. The microhardness of the coating ranged between 980 and 1180 HV. The above processes caused a gradient in alloying elements in the coating and the substrate due to the counter diffusion of C, Cr, and Mn atoms during post-plasma heat treatments and led to the formation of a transitional layer and different structural zones in near-surface layers of cast iron. As compared to gray cast iron (non-heat-treated and heat-treated), the coating had 3.0–3.2 times higher abrasive wear resistance and 1.2–1208.8 times higher dry-sliding wear resistance (depending on the counter-body material). The coating manifested a tendency of solidification cracking caused by tensile stress due to the formation of a mostly austenitic structure with a lower specific volume. Cracks facilitated abrasive wear and promoted surface spalling under dry-sliding against the diamond cone.

Effect of alternate biomimetic coupling units on dry sliding wear resistance of gray cast iron

2016 ◽  
Vol 32 (2) ◽  
pp. 343-353 ◽  
Author(s):  
Qi Sui ◽  
Hong Zhou ◽  
Haifeng Zhang ◽  
Li Feng ◽  
Lin Yang ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Cast Iron ◽  
Sliding Wear ◽  
Gray Cast Iron ◽  
Gray Cast ◽  
Dry Sliding Wear ◽  
Dry Sliding ◽  
Image Position ◽  
Biomimetic Coupling

Abstract

scholarly journals Friction and Wear Characteristics of TIG Processed Surface Modified Grey Cast Iron

2009 ◽  
Vol 1 (3) ◽  
pp. 516-527 ◽  
Author(s):  
S. N. Pandya ◽  
S. K. Nath ◽  
G. P. Chaudhary
Keyword(s):  
Cast Iron ◽  
Sliding Wear ◽  
Gray Cast Iron ◽  
Welding Current ◽  
Grey Cast Iron ◽  
Gray Cast ◽  
Dry Sliding Wear ◽  
Dry Sliding ◽  
Modified Surfaces ◽  
Grey Cast

The surface of gray cast iron has been modified by Tungsten Inert Gas (TIG) process. Welding current of magnitude 25, 35, and 45 amperes have been used to melt the surface of gray cast iron. Microstructural characterization, hardness measurement and dry sliding wear tests have been performed on these modified surfaces. It has been observed that increase in welding current caused the microstructure of grey cast iron to be gradually refined. Graphite flakes segregated between interdendritic regions in the as-received grey cast iron have been completely replaced by a uniform distribution of finer graphite flakes in the matrix. Hardness has been found to increase with increase in welding current. Wear resistance of the gray cast iron also increased with increase in the welding current reaching maximum value for 45 amperes. The increased hardness and wear resistance of these modified surfaces have been explained on the basis of microstructural changes occurring at the surfaces of gray cast iron.  Keywords: Gray cast iron; Surface modification; TIG process; Dry sliding wear.© 2009 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved.DOI: 10.3329/jsr.vli3.2577    J. Sci. Res. 1 (3), 516-527 (2009)

scholarly journals The Kinetics and Dry-Sliding Wear Properties of Boronized Gray Cast Iron

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Dong Mu ◽  
Bao-luo Shen
Keyword(s):  
Cast Iron ◽  
Sliding Wear ◽  
Single Phase ◽  
Gray Cast Iron ◽  
Gray Cast ◽  
Dry Sliding Wear ◽  
Dry Sliding ◽  
X Ray Diffraction ◽  
Wear Properties ◽  
Wear Tests

Some properties of boride formed on gray cast iron (GCI) have been investigated. GCI was boronized by powder-pack method using Commercial LSB-II powders at 1123, 1173, and 1223 K for 2, 4, 6, and 8 h, respectively. Scanning electron microscopy showed that boride formed on the surface of boronized GCI had tooth-shaped morphology. The hardness of boride formed on surfaces of GCI ranged from 1619 to 1343 HV0.025, and quenched and tempered GCI ranged from 400 to 610 HV0.025. The boride formed in the coating layer confirmed by X-ray diffraction analysis was Fe2B single phase. Depending on boronizing time and temperature, the thickness of coating layers on boronized GCI ranged from 26 to 105 μm. The activation energy was 209 kJ/mol for boronized GCI. Moreover, the possibility of predicting the iso-thickness of boride layers variation was studied. Dry-sliding wear tests showed that the wear resistance of boronized sample was greater than that of quenched and tempered sample.

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

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.

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

2015 ◽  
Vol 24 (6) ◽  
pp. 2511-2520 ◽  
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

scholarly journals An investigation of abrasive wear and corrosion behavior of surface repair of gray cast iron by SMAW

2017 ◽  
Vol 6 (1) ◽  
pp. 90-95 ◽  
Author(s):  
Alireza Sadeghi ◽  
Ahmad Moloodi ◽  
Masoud Golestanipour ◽  
Meysam Mahdavi Shahri
Keyword(s):  
Cast Iron ◽  
Abrasive Wear ◽  
Corrosion Behavior ◽  
Gray Cast Iron ◽  
Gray Cast ◽  
Wear And Corrosion ◽  
Surface Repair

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

2012 ◽  
Vol 1516 ◽  
pp. 115-120 ◽  
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.

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

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).

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

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.

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

2020 ◽  
Vol 9 (4) ◽  
pp. 8163-8171 ◽  
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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