Effect of Rolling Process on Microstructure and Wear Properties of High Carbon Equivalent Gray Cast Iron

2021 ◽  
Vol 36 (6) ◽  
pp. 903-910
Author(s):  
Yihong Zhao ◽  
Qianyu Chen ◽  
Zhiwei Zheng ◽  
Pei Cao ◽  
Ziyu Gong ◽  
...  
Keyword(s):  
Cast Iron ◽  
Gray Cast Iron ◽  
Rolling Process ◽  
Gray Cast ◽  
Carbon Equivalent ◽  
High Carbon ◽  
Wear Properties

Microstructure and Properties of High Carbon Equivalent Gray Cast Iron Modified by Rare Earth

2011 ◽  
Vol 295-297 ◽  
pp. 962-968
Author(s):  
Fu Min Chu ◽  
Xin Hui Zu ◽  
Zhong Kui Zhao ◽  
Xiao Yun Jiang
Keyword(s):  
Rare Earth ◽  
Cast Iron ◽  
Rare Earth Metal ◽  
Gray Cast Iron ◽  
Earth Metal ◽  
Gray Cast ◽  
Carbon Equivalent ◽  
High Carbon ◽  
Microstructure And Properties ◽  
The Rare Earth

Microstructure and properties of the high carbon equivalent gray cast iron modified by the rare earth metal are investigated by optical microscopy, scanning electronic microscopy, Brinell hardness and tensile testing. The results show that the primary austenite dendritic is refined, and the morphology of graphite is transformed from A-type to D-type undercooling graphite with increment of the rare earth metal (REM), even with the vermicular graphite present. The lamellae are becoming thinner with increment of rare earth metal. There are double peaks between the addition of the rare earth metal and the tensile strength/hardness. The iron would have the best comprehensive property when 0.30% REM is added.

ISO 185/JL/275

Alloy Digest ◽  
2021 ◽  
Vol 70 (3) ◽  
Keyword(s):  
Tensile Strength ◽  
Cast Iron ◽  
Gray Cast Iron ◽  
Heat Treating ◽  
Gray Cast ◽  
Damping Capacity ◽  
Wear Properties ◽  
Lower Strength ◽  
Test Pieces ◽  
Lower Carbon

Abstract ISO 185/JL/275 is an intermediate-tensile-strength gray cast iron that has a pearlitic matrix and a tensile strength of 275–375 MPa (40–54 ksi), when determined on test pieces machined from separately cast, 30 mm (1.2 in.) diameter test bars. Compared with the lower strength gray cast iron grades, ISO 185/JL/275 contains lower carbon and silicon contents, while still maintaining good thermal conductivity and damping capacity. Owing to its higher tensile strength and hardness, it exhibits superior wear properties. This datasheet provides information on composition, physical properties, elasticity, tensile properties, and bend strength as well as fatigue. It also includes information on casting and heat treating. Filing Code: CI-79. Producer or source: International Organization for Standardization.

scholarly journals Evaluation of the Mechanical Properties of Gray Cast Iron Using Electrical Resistivity Measurement

2016 ◽  
Vol 16 (4) ◽  
pp. 29-32 ◽  
Author(s):  
M. Bieroński ◽  
O. Krasa ◽  
M. Koza ◽  
D. Ksiąźek ◽  
R. Kuś
Keyword(s):  
Tensile Strength ◽  
Electrical Resistivity ◽  
Cast Iron ◽  
Gray Cast Iron ◽  
Gray Cast ◽  
Carbon Equivalent ◽  
Electrical Resistivity Measurement ◽  
Regression Equations ◽  
Power Functions ◽  
The Relationship

Abstract In this paper an attempt to determine the relationship between the electrical resistivity and the tensile strength and hardness of cast iron of carbon equivalent in the range from 3.93% to 4.48%. Tests were performed on the gray cast iron for 12 different melts with different chemical composition. From one melt poured 6 samples. Based on the study of mechanical and electro-resistive determined variation characteristics of tensile strength, hardness and resistivity as a function of the carbon equivalent. Then, regression equations were developed as power functions describing the relationship between the resistivity of castings and their tensile strength and hardness. It was found a high level of regression equations to measuring points, particularly with regard to the relationship Rm=f(ρ). The obtained preliminary results indicate the possibility of application of the method of the resistance to rapid diagnostic casts on the production line, when we are dealing with repeatable production, in this case non variable geometry of the product for which it has been determinated before a regression equation.

scholarly journals Evolution of the Macrostructure of Gray Cast Iron from Eutectic to Hypereutectic Composition

2018 ◽  
Vol 925 ◽  
pp. 110-117 ◽  
Author(s):  
Marcos López ◽  
Juan M. Massone ◽  
Roberto Enrique Boeri
Keyword(s):  
Cast Iron ◽  
Gray Cast Iron ◽  
Eutectic Reaction ◽  
Liquidus Line ◽  
Nucleating Agent ◽  
Gray Cast ◽  
Carbon Equivalent ◽  
Flake Graphite ◽  
Cast Irons ◽  
Coupled Growth

This work studies the evolution of the macrostructure of gray cast iron as the carbon equivalent (CE) increases from near-eutectic to highly hypereutectic values. The macrostructure of spherical samples of flake graphite irons of CE ranging between 4.24% and 5.23% was revealed by using direct austempering after solidification technique (DAAS). The results were analysed by applying the concept of coupled zone for gray cast irons. The coupled zone is a region in the stable Fe-C-Si diagram in which solidification proceeds as a cooperative growth of both austenite and flake graphite. The coupled zone for gray cast iron is claimed to be asymmetrical as the eutectic reaction is extended towards the prolongation of the austenite liquidus line. All the samples investigated in the present study show the presence of relatively large austenite grains, demonstrating that the number of active nucleation sites of austenite per unit volume is small. The observation of the microstructure shows the presence of several units of coupled growth inside each austenite grain, what proves that many eutectic colonies have grown from the same austenite nucleus, even for highly hypereutectic compositions. Colour etching was employed to reveal the “hidden” dendrites present in the microstructure. The results suggest that proeutectic graphite is not a good nucleating agent for austenite. These results contribute to the understanding of the solidification of hypereutectic gray irons and verify the earlier understanding of the solidification of eutectic gray irons and its extension to hypereutectic compositions.

scholarly journals Effects of Inoculation on the Pearlitic Gray Cast Iron with High Thermal Conductivity and Tensile Strength

Materials ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 1876 ◽  
Author(s):  
Guiquan Wang ◽  
Xiang Chen ◽  
Yanxiang Li ◽  
Zhongli Liu
Keyword(s):  
Thermal Conductivity ◽  
Tensile Strength ◽  
Cast Iron ◽  
Gray Cast Iron ◽  
High Thermal Conductivity ◽  
Gray Cast ◽  
Carbon Equivalent ◽  
Metallographic Analysis ◽  
Structure And Properties ◽  
Nucleation Sites

With the aim of improving the thermal conductivity and tensile strength of pearlitic gray cast iron, the influence of inoculation on structure and properties was experimentally investigated. Three group of irons with similar compositions were inoculated by Zr-FeSi, Sr-FeSi, and SiC inoculants, respectively. The metallographic analysis was used to measure the maximum graphite length, primary dendrites amount and eutectic colonies counts. For a certain carbon equivalent, it was confirmed that the thermal conductivity of pearlitic gray cast iron has a direct correlation with the maximum graphite length while the tensile strength was influenced mainly by the primary dendrites amount. The optimal structure and highest thermal conductivity and tensile strength were obtained by Sr-FeSi inoculant. MnS particles act a pivotal part in modifying the structure of gray cast iron. It was found that providing nucleation sites both for graphite and primary austenite is important to promote the thermal conductivity and strength. However, excessive nuclei (MnS particles) results in shorter graphite flakes and thus the depressive growth of primary dendrites.

Interface Characterization of Bimetallic Casting with a 304 Stainless Steel Surface Layer and a Gray Cast Iron Base

2015 ◽  
Vol 1120-1121 ◽  
pp. 993-998 ◽  
Author(s):  
Mohamed Ramadan
Keyword(s):  
Cast Iron ◽  
Gray Cast Iron ◽  
Iron Alloy ◽  
Interfacial Microstructure ◽  
304 Stainless Steel ◽  
Gray Cast ◽  
Carbon Equivalent ◽  
Stainless Steel Surface ◽  
Coherent Interfaces

Bimetallic castings are widely employed as working elements in winning machines which work in conditions of intensive friction wear. The main features of wear are: dynamic percussive loads, intensive abrasive wear caused by erosion and corrosion. Three cylindrical rods cavities of the same dimensions of φ 20x200 mm were made in sand mould. Different amount of liquid iron alloy with carbon equivalent of 4.14, Mn of 0.58 and Cu of 0.17 wt% was poured into the three rod cylindrical cavities over the solid 304 stainless steels cylindrical desks inserts. Good coherent interfaces for all liquid/Solid volumes (16 to 24) are produced and multi-layers interfacial microstructure bimetal are produced. Increasing the liquid/solid volumes from 16 to 24 increases the thickness of transient layer from 52 to 89 μm and decreases the amount of ledeburite in the structure of solidified gray cast iron.

Tribological Properties of MoS2-Coated Gray Cast Irons with Some Different Matrix Phases under the Boundary Lubricating Conditions

2007 ◽  
Vol 353-358 ◽  
pp. 788-791
Author(s):  
Takashi Murakami ◽  
T. Inoue ◽  
H. Shimura ◽  
Shinya Sasaki ◽  
Miki Nakano
Keyword(s):  
Cast Iron ◽  
Friction And Wear ◽  
Gray Cast Iron ◽  
Gray Cast ◽  
Wear Properties ◽  
Cast Irons ◽  
Friction Coefficients ◽  
Friction Tester ◽  
Friction And Wear Properties ◽  
Steel Balls

In this study, Fe-2.0Si-4.6C (mass%) gray cast iron disk specimens with three different matrix phases were coated with MoS2 using pressure spraying, and the friction and wear properties of the specimens were investigated against AISI52100 steel and polytetrafluoroethylene balls under the lubrication of oil using an Optimol SRV friction tester. When AISI52100 steel balls were used as the paired material, all of the MoS2-coated gray cast iron specimens showed lower friction coefficients and higher wear resistance than the non-coated disk specimens. On the other hand, MoS2-coated gray cast iron specimens exhibited higher friction coefficients than non-coated disk specimens for the most part, when polytetrafluoroethylene balls were used as the paired material.

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