scholarly journals A COATED CAST IRON CRUCIBLE FOR USE WITH EUTECTIC Al-Si ALLOY IN THE TEMPERATURE RANGE 595-650 C

1957 ◽  
Author(s):  
F.L. Yaggee
Keyword(s):  
Cast Iron ◽  
Temperature Range ◽  
Iron Crucible

scholarly journals Computational Determination of Macroscopic Mechanical and Thermal Material Properties for Different Morphological Variants of Cast Iron

Metals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1588
Author(s):  
Christoph Herrmann ◽  
Stefan Schmid ◽  
Daniel Schneider ◽  
Michael Selzer ◽  
Britta Nestler
Keyword(s):  
Thermal Properties ◽  
Cast Iron ◽  
Synthetic Approach ◽  
Mechanical And Thermal Properties ◽  
Data Infrastructure ◽  
Temperature Range ◽  
Young’S Moduli ◽  
Graphite Morphology ◽  
Grey Cast ◽  
Morphological Variants

The sensitivity of macroscopic mechanical and thermal properties of grey cast iron is computationally investigated for a variety of graphite morphologies over a wide temperature range. In order to represent common graphite morphologies according to EN ISO 945-1, a synthetic approach is used to algorithmically generate simulation domains. The developed mechanical and thermal model is applied in a large simulation study. The study includes statistical volume elements of the graphite morphology classes GJL-150 and IA2 to IA5, with 10, 11 and 12  v.−% of graphite precipitations, respectively, for a temperature range from 20 to 750 °C. Homogenised macroscopic quantities, such as the Young’s moduli, Poisson’s ratios, yield strengths and thermal conductivities, are predicted for different morphology classes by applying simulation and data analysis tools of the research data infrastructure Kadi4Mat. This is the first work to determine the mechanical and thermal properties of the morphology classes defined in EN ISO 945-1.

scholarly journals Research of Properties and Structure of Boron-modified Roll-foundry Iron

2016 ◽  
Vol 5 (2) ◽  
pp. 88 ◽  
Author(s):  
K. N. Vdovin ◽  
A. A. Zaitseva ◽  
N. A. Feoktistov
Keyword(s):  
Cast Iron ◽  
Thermal Treatment ◽  
Research Group ◽  
Retained Austenite ◽  
Crack Formation ◽  
Main Process ◽  
Metal Mold ◽  
Temperature Range ◽  
Kinetics Of ◽  
Chilled Cast Iron

<p class="1Body">The aim of the research is to determine the properties and the structure of boron-alloyed iron used for rolls production. It was found that boron can form different carbides in iron, which significantly improve both hardenability and microhardness. Iron borides Fe<sub>3</sub>(B,C) are also formed in cast iron as only 40% of carbon atoms in cementite matrix can be replaced by boron. Besides, boron influences the temperatures of structural constituents decomposition (increases the rate of cementite decomposition), it also decreases the temperatures of developing phase transformations. The research group determined the kinetics of martensite decomposition, which is formed when chilled cast iron is poured into a metal mold and then undergoes thermal treatment to the temperature of 400 °C. In the temperature range of 210 – 400 °C the main process is decomposition of the retained austenite into bainite, while in the temperature range of 400 – 500 °C, the main process is decomposition of martensite and forming a ferrite-cementite mixture. In order to get the necessary properties of the roll face, it is necessary to provide its thermal treatment (tempering), when it is heated to the temperature of 400 °C to avoid martensite decomposition, because otherwise in the process of roll operation it can result in crack formation. </p>

Influence of the Melt Treatment Method on the Properties of Cast Iron

2021 ◽  
Vol 316 ◽  
pp. 438-442
Author(s):  
Vladimir K. Afanasyev ◽  
Marina M. Sagalakova ◽  
Evgeny V. Tankov
Keyword(s):  
Cast Iron ◽  
Expansion Coefficient ◽  
Linear Expansion ◽  
Treatment Method ◽  
Preliminary Heat Treatment ◽  
Linear Expansion Coefficient ◽  
Water Steam ◽  
Test Range ◽  
Temperature Range ◽  
Melt Treatment

The article is devoted to studying the effect of liquid melt treatment with a substance having high affinity with hydrogen – lead-base silumin. Taking into account that gases (hydrogen, nitrogen and oxygen) are present everywhere, including alloys, a series of experiments was carried out on treating melt of blast furnace iron with substances having great affinity with hydrogen. It is established: when treating melt with lead-base silumin in the low-temperature test interval, there is a slight increase in the linear expansion coefficient (LEC) at 100°C, compared with the initial one, to 8.210-6, deg-1. In the temperature range of 100-150°C LEC decreases to a minimum value of 7.210-6, deg-1. In the average temperature range of 150-300°C, a sharp, anomalous increase is noticeable, compared with the initial one up to 15.5210-6, deg-1. When studying the microstructure of cast iron after processing the melt with lead silumin, the formation of ledeburite structure is stated. Samples treated with lead-base silumin were subjected to cementation by feeding water steam at 900°C for 1-5 hours. It should be noted that, in the temperature range of 50-150°C, the values of the linear expansion coefficient lie almost in a straight line in the entire field of study. The coefficient varies from 10.810-6, deg-1 at 50°C to 13.710-6, deg-1 at 450°C. Preliminary heat treatment of cast iron in the carburizer made by the Bondyuzhsky plant with water steam smoothes anomalies of LEC and increases its initial values, and grinds perlite and cementite as well. Subsequent quenching in water with a temperature of 1000°C significantly changes the linear expansion coefficient of cast iron. Hardening of samples after cementation sharply reduces the linear expansion coefficient in the test range of 150-200°C, and in the temperature range of 350-450°C negative values of LEC are observed. Thus, it can be concluded, that treating the melt with lead-base silumin, cementation in the medium of the carburizer made by the Bondyuzhsky plant and subsequent hardening leads to sharp changes of the linear expansion coefficient up to negative values. The identified properties suggest the possibility of using cast iron where it is necessary to constancy of LEC and there are no requirements for the weight of the product.

scholarly journals Research of Properties and Structure of Boron-modified Roll-foundry Iron

2016 ◽  
Vol 5 (2) ◽  
pp. 82
Author(s):  
K. N. Vdovin ◽  
A. A. Zaitseva ◽  
N. A. Feoktistov
Keyword(s):  
Cast Iron ◽  
Thermal Treatment ◽  
Research Group ◽  
Retained Austenite ◽  
Crack Formation ◽  
Main Process ◽  
Metal Mold ◽  
Temperature Range ◽  
Kinetics Of ◽  
Chilled Cast Iron

<p class="1Body">The aim of the research is to determine the properties and the structure of boron-alloyed iron used for rolls production. It was found that boron can form different carbides in iron, which significantly improve both hardenability and microhardness. Iron borides Fe<sub>3</sub>(B,C) are also formed in cast iron as only 40% of carbon atoms in cementite matrix can be replaced by boron. Besides, boron influences the temperatures of structural constituents decomposition (increases the rate of cementite decomposition), it also decreases the temperatures of developing phase transformations. The research group determined the kinetics of martensite decomposition, which is formed when chilled cast iron is poured into a metal mold and then undergoes thermal treatment to the temperature of 400 °C. In the temperature range of 210 – 400 °C the main process is decomposition of the retained austenite into bainite, while in the temperature range of 400 – 500 °C, the main process is decomposition of martensite and forming a ferrite-cementite mixture. In order to get the necessary properties of the roll face, it is necessary to provide its thermal treatment (tempering), when it is heated to the temperature of 400 °C to avoid martensite decomposition, because otherwise in the process of roll operation it can result in crack formation. </p>

scholarly journals Computational Determination of Macroscopic Mechanical and Thermal Material Properties for Different Microstructural Variants of Cast Iron

2021 ◽  
Author(s):  
Christoph Herrmann ◽  
Stefan Schmid ◽  
Daniel Schneider ◽  
Michael Selzer ◽  
Britta Nestler
Keyword(s):  
Cast Iron ◽  
Material Properties ◽  
Research Data ◽  
Synthetic Approach ◽  
Mechanical And Thermal Properties ◽  
Data Infrastructure ◽  
Temperature Range ◽  
Young’S Moduli ◽  
Grey Cast

The sensitivity of macroscopic mechanical and thermal properties of grey cast iron is computationally investigated for a variety of graphite microstructures over a wide temperature range. In order to represent common graphite microstructures according to DIN EN ISO 945-1, a synthetic approach is used to algorithmically generate simulation domains. The developed mechanical and thermal model is applied in a large simulation study. The study includes statistical volume elements of the graphite microstructures classes GG-15 and IA2 to IA5, with 10 v.-%, 11 v.-% and 12 v.-% graphite, respectively, for a temperature range from 20 &deg;C to 750 &deg;C. Homogenized macroscopic quantities such as the Young's moduli, Poisson's ratios, yield strengths and thermal conductivities are predicted for the different microstructure classes by applying simulation and data analysis tools of the research data infrastructure Kadi4Mat.

scholarly journals Towards a temperature dependent and probabilistic lifetime concept for nodular ductile cast iron materials undergoing isothermal and thermo-mechanical fatigue

2018 ◽  
Vol 165 ◽  
pp. 19006
Author(s):  
Elena Garcia Trelles ◽  
Christoph Schweizer ◽  
Stefan Eckmann
Keyword(s):  
Cast Iron ◽  
Low Cycle Fatigue ◽  
Crack Tip ◽  
Fatigue Behaviour ◽  
Ductile Cast Iron ◽  
Crack Advance ◽  
Crack Tip Opening Displacement ◽  
Opening Displacement ◽  
Temperature Range ◽  
Intergranular Embrittlement

In this investigation, the fatigue behaviour of a ductile cast iron with high content of silicon and molybdenum, was experimentally characterized by performing isothermal low cycle fatigue (LCF) tests as well as out-of-phase thermomechanical fatigue (OPTMF) tests within the temperature range RT – 500 °C. The studied material shows an embrittlement at temperatures nearby 400 °C. A possible explanation for the observed lifetime reduction is intergranular embrittlement (IE). A mechanism based lifetime model is proposed for assessing the lifetime. The model is based on the assumption that the crack advance per cycle is correlated with the cyclic crack tip opening displacement (ΔCTOD) attributed to the crack tip blunting caused by accumulation of plastic and creep deformations ahead of the crack tip. Intergranular embrittlement is accounted for by introducing a temperature and strain rate dependent prefactor in the crack growth law, which only acts in a certain temperature range. The model is calibrated for a GJS material and successfully applied to predict the lifetime of this material when undergoing isothermal and non-isothermal mechanical loadings. A probabilistic interpretation of the scatter of the investigated material is presented in conjunction with the random nature of the initial defect size distribution.

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