Grey Cast Iron Strength аs Function оf Primary Austenite Dendrites Volume Fraction

2020 ◽  
Vol 299 ◽  
pp. 729-733
Author(s):  
A.A. Baron ◽  
L.V. Palatkina ◽  
I.L. Gonik
Keyword(s):  
Composite Material ◽  
Cast Iron ◽  
Ultimate Strength ◽  
Primary Structure ◽  
Gray Cast Iron ◽  
Volume Fraction ◽  
Grey Cast Iron ◽  
Gray Cast ◽  
Grey Cast ◽  
Quantitative Contribution

On the basis of approach to primary structure of gray cast iron as to an analog of the composite material, reinforced by discrete fibers, the quantitative contribution of dendritic crystals and the eutectic matrix to ultimate strength in tension is defined.

α-SiAlON: Development and Machining Test on Gray Cast Iron

2008 ◽  
Vol 591-593 ◽  
pp. 565-571 ◽  
Author(s):  
Olivério Moreira Macedo Silva ◽  
Maria do Carmo de Andrade Nono ◽  
José Vitor C. Souza ◽  
M.V. Ribeiro
Keyword(s):  
Cast Iron ◽  
Cutting Tool ◽  
Gray Cast Iron ◽  
Cutting Tools ◽  
Grey Cast Iron ◽  
Gray Cast ◽  
Machining Parameters ◽  
Ceramic Cutting Tool ◽  
Sialon Ceramic ◽  
Grey Cast

The α-SiAlON ceramic cutting tool insert is developed. Silicon nitride and additives powders are pressed and sintered in the form of cutting tool inserts at temperature of 1900 oC. The physics and mechanical properties of the inserts like green density, weight loss, relative density, hardness and fracture toughness are evaluated. Machining studies are conducted on grey cast iron workpiece to evaluate the performance of α-SiAlON ceramic cutting tool. In the paper the cutting tool used in higher speed showed an improvement in the tribological interaction between the cutting tools and the grey cast iron workpiece resulted in a significant reduction of flank wear and roughness, because of better accommodation and the presence of the graphite in gray cast iron. The above results are discussed in terms of their affect at machining parameters on gray cast iron.

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 STRUCTURAL CHANGES UNDER HEATING IN DENDRITIC CRYSTALS OF GREY CAST IRON

2020 ◽  
pp. 76-80
Author(s):  
A. Baron ◽  
L. Palatkina ◽  
M. Taranova ◽  
D. Gurulev
Keyword(s):  
Composite Material ◽  
Cast Iron ◽  
Critical Point ◽  
Primary Structure ◽  
Structural Changes ◽  
Grey Cast Iron ◽  
Primary Austenite ◽  
Grey Cast

Based on approach to primary structure of grey pearlite cast iron as analogue of composite material reinforced with discrete fibers, changes occurring in dendritic crystals of primary austenite at heating to temperatures not exceeding critical point of А are analyzed.

scholarly journals COMPUTER SIMULATION OF CASTING AND SOLIDIFICATION PROCESSES OF STANDARD CAST SAMPLES OF GREY CAST IRON

2021 ◽  
pp. 64-71
Author(s):  
A. A. Baron ◽  
L. V. Palatkina ◽  
S. V. Palatkin
Keyword(s):  
Computer Simulation ◽  
Cast Iron ◽  
Computer Modeling ◽  
Gray Cast Iron ◽  
Grey Cast Iron ◽  
Gray Cast ◽  
Casting And Solidification ◽  
Factors Affecting ◽  
Solidification Processes ◽  
Grey Cast

For standard tension samples of gray cast iron, the possibility of using computer modeling to study factors affecting the morphology of dendritic crystals and the volumetric arrangement of defects of shrinkage origin is shown.

Study on the Influences on Microstructure and Properties of High-Strength Grey Cast Iron in Addition to Alloying Elements Nb

2013 ◽  
Vol 800 ◽  
pp. 221-224
Author(s):  
Jun Tao Zhang ◽  
Feng Zhang Ren
Keyword(s):  
Cast Iron ◽  
Gray Cast Iron ◽  
Mechanical Performance ◽  
High Strength ◽  
Optical Microscope ◽  
Gray Cast ◽  
Dynamic Strain ◽  
Cast Irons ◽  
Grey Cast ◽  
The Relationship

The increase of the strength of gray cast iron is mainly depended on alloying. However, with the improvement of strength, its processing performance will always decrease. So three different gray cast irons are studied in this experiment, including adding 0.1% Nb elements, adding 0.2% Nb elements and adding 0.3% Nb elements, to investigate the Nbs effect to the mechanical performance of gray cast iron, we adopt Dynamic Strain Amplifier to measure cutting force to evaluate processing performance, use Optical Microscope and Electron Microscopy observe each samples organization, explains the relationship between Nbs content and the mechanical and processing performance of gray cast iron from micro-level. Finally, we draw the conclusion: when the Nb comes to 0.3 percent, the appearance of E-type graphite and Nb carbide durum granular will greatly decrease its processing performance.

Empirical Comparison of Sliding Friction and Wear Behaviors of Gray and White Cast Iron

2010 ◽  
Author(s):  
Mehdi Hashemi ◽  
Rahmatollah Ghajar
Keyword(s):  
Cast Iron ◽  
Friction And Wear ◽  
Sliding Friction ◽  
Gray Cast Iron ◽  
White Cast Iron ◽  
Volume Fraction ◽  
Gray Cast ◽  
Graphite Flake ◽  
Lubricant Property ◽  
Wear Tests

In this paper, sliding friction and wear behaviors of gray cast iron A35 and white cast iron manufactured by quenching from the same cast iron in water were studied and compared by employing pin-on-disk wear tests. Microstructure of the worn surfaces before and after the wear tests were investigated by optical microscope observations. These images show that flakes separated from the surface in gray cast iron due to delamination process, while in white cast iron, the separation of materials from its surface is in the form of powder. In addition, the gray cast iron had higher graphite volume fraction with Type-A graphite flake morphology. The results show that white cast iron has less rate of wear than gray cast iron due to the higher hardness. However, gray cast iron because of presenting graphite flakes in its surface (lubricant property) has lower average coefficient of friction.

scholarly journals ON THE POSSIBILITY OF APPLYING A NEW PARAMETER OF THE PRIMARY STRUCTURE OF GRAY CAST IRON TO EVALUATE THE STRENGTH OF CASTINGS

2020 ◽  
pp. 66-71
Author(s):  
A. A. Baron ◽  
L. V. Palatkina
Keyword(s):  
Tensile Strength ◽  
Cast Iron ◽  
Ultimate Tensile Strength ◽  
Correlation Coefficient ◽  
Primary Structure ◽  
Gray Cast Iron ◽  
Eutectic Phase ◽  
Gray Cast ◽  
Primary Austenite ◽  
Lamellar Graphite

The possibility of evaluating the strength of pearlite gray cast iron with lamellar graphite using the ratio of the area of the interdendritic eutectic phase to the perimeter of the primary austenite dendritic crystals was investigated. It is found that this parameter increases from 15,1 to 39,3 as the ultimate tensile strength of cast iron decreases from 300 to 180 MPa. The correlation coefficient for this relationship was 0.9.

Application of the Hydraulic Diameter of Interdendritic Space for Calculating the Ultimate Tensile Strength of Gray Cast Iron

2021 ◽  
Vol 410 ◽  
pp. 74-79
Author(s):  
Aleksandr A. Baron ◽  
Lyubov' V. Palatkina ◽  
Stanislav V. Palatkin
Keyword(s):  
Tensile Strength ◽  
Cast Iron ◽  
Comparative Analysis ◽  
Ultimate Tensile Strength ◽  
Gray Cast Iron ◽  
Volume Fraction ◽  
Hydraulic Diameter ◽  
Gray Cast ◽  
Iron Castings ◽  
Interdendritic Space

A comparative analysis of methods for estimating the gray cast iron ultimate tensile strength σu by the hydraulic diameter of interdendritic space DHydIP and the volume fraction of primary austenite dendrites fdc is performed. Almost the same accuracy of cast iron castings σu estimation according to both these parameters DHydIP and fdc of the primary microstructure is shown.

Effect of Cooling Rate on Drop-Tube Processed Commercial Grey Cast Iron

2015 ◽  
Author(s):  
Olamilekan R. Oloyede ◽  
Tim Bigg ◽  
Andrew M. Mullis
Keyword(s):  
Cast Iron ◽  
Cooling Rate ◽  
Volume Fraction ◽  
Microstructural Analysis ◽  
Control Sample ◽  
Grey Cast Iron ◽  
Drop Tube ◽  
Flake Graphite ◽  
Cooling Rates ◽  
Grey Cast

This study focuses on the fundamental of solidification of commercial grey cast iron as a function of the externally applied cooling rate. Grey cast iron powders were prepared using the drop-tube method, which is a good analogue for commercial production via high pressure gas atomization. The as-solidified droplets were collected and sieved into size ranges from > 850 μm to < 53 μm diameter, with estimated cooling rates of 500 K s−1 to 75,000 K s−1, with each sieve fraction being prepared for metallographic characterization. The microstructure and phase composition of the powders were analyzed using XRD, optical and scanning electron microscopy, with the results being compared against a control sample subject to slow cooling in the drop-tube crucible; which has typical grey cast iron microstructure with extensive flake graphite in a largely ferrite matrix. In contrast, flake graphite was absent in virtually all the drop-tube samples, even in those with the most modest cooling rates. Microstructural analysis revealed that as the cooling rate increased there was less fragmentation of the primary austenite/ferrite dendrites and the volume fraction of primary dendritic material increased. Hence, as the particle fractions get smaller (D < 106 μm) there is a distinct microstructural evidence of a martensite phase which is related to its better mechanical properties (microhardness) as the sample sizes decrease.

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