Determining the carbon equivalent of cast iron by the thermo-calc program

Баженов, В. Е.; Пикунов, М. В.

doi:10.3103/s0967091211110027

Cited by 9 publications

(7 citation statements)

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“…The reason of this behaviour can be explained firstly by overall chemical composition with relation to carbon equivalent: the carbon equivalent of majority commercial cast irons considerably lower that of MoNiCa [13,14]. Secondly, it is especially important that new structural material has an original and successful ratio of the triad of alloying additives Mo-Ni-Cu (Eq.…”

Section: Fig 4 Comparison Of Tensile Strength-ductility Ratio: New mentioning

confidence: 99%

Research on Tensile Behaviour of New Structural Material MoNiCa

Bahdanovich¹,

Bendikienė²,

Česnavičius³

et al. 2019

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This article presents the results of a set of innovative research to analyse a new structural material – steel like austempered ductile cast iron with mechanical properties similar to heat-treated steel, and with technological and exploitation characteristic close to high-strength cast iron with nodular graphite. Specific examples of its high efficiency for the manufacture of critical, mass and heavy-loaded components of modern machinery and equipment are presented. New structural material MoNiCa was tested on tension and was compared to commercial grades of austempered ductile cast irons and heat treated steels. Unconventional behaviour of examined material was observed: with tensile strength increase to almost 1600 MPa the metal became less brittle. Hardness test revealed another distinctive feature of new material that there is no linear relation between strength and hardness increase, different hardness values ~ 40 HRC or ~ 55 HRC can be achieved with the same tensile strength 1000 – 1200 MPa. Microscopic analysis demonstrated of sophisticated structure formed owing to different regimes of austempering treatment. Specific properties emerged from successful ratio of three elements Mo, Ni, and Cu (carbon equivalent), and properly chosen heat treatment modes. DOI: http://dx.doi.org/10.5755/j01.ms.25.3.23079

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Section: Fig 4 Comparison Of Tensile Strength-ductility Ratio: New mentioning

confidence: 99%

Research on Tensile Behaviour of New Structural Material MoNiCa

Bahdanovich¹,

Bendikienė²,

Česnavičius³

et al. 2019

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“…Вуглецевий еквівалент визначають, зазвичай, експериментально, іноді термодинамічними розрахунками. В статті [2] надано посилання на літературні джерела з прикладами на цю тему. У технічній літературі запропоновано різні формули для розрахунків Секв, які дещо різняться між собою.…”

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“…Відповідно формули мають різний набір хімічних елементів, а також різні величини коефіцієнтів i c G . Наприклад, в статті [2] запропонована наступна формула для розрахунку вуглецевого еквіваленту, яка отримана методом регресійного аналізу: S 0,26 Mn 0,015 P 0,33 Si 0,3 екв…”

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“…В технічній літературі за темою, що розглядається, відомі формули для розрахунку вуглецевого еквіваленту чавуну з використанням даних щодо величини евтектичної точки на діаграмі залізо-вуглець. Наприклад, у статті [2] запропоновано наступну формулу: Проблеми автоматизації, механізації та комп'ютерізації процесів лиття…”

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“…Автори статті [2] звертають увагу, що, по-перше, згідно з формулою (4) при Севт = 4,34 отримуємо Секв = с, %. По-друге, результати розрахунків Секв за формулами (4) і (3) дуже близькі Севт.…”

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Definition of carbon equivalent and degree of eutecticity of cast iron in foundry production

Sirenko¹,

Mazur²

2022

Processy litʹâ

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The issues related to the essence of the concepts of carbon equivalent, an indicator of the degree of eutecticity and the ratio of carbon content to silicon content for characterizing the chemical composition and properties of gray cast iron were analyzed. The results of studies of the carbon equivalent value, the degree of eutecticity and the C/Si ratio of the chemical composition of synthetic cast iron, which is used for the manufacture of brake pads and the «Khanin wedge» of railway rolling stock, are presented. Examples of different approaches and formulas for determining the limits and methods of using the carbon equivalent of the chemical composition of cast iron to characterize the weldability of steels, coefficient of friction, wear, other operational indicators of cast iron brake pads, and evaluation of the quality of cast iron as a whole are given and analyzed. Within the standards-regulated ranges of the content of chemical elements in cast iron, the value of its carbon equivalent in individual smelting batches of products can differ significantly (by 30 %). With certain ratios of the main elements in the chemical composition of cast iron, the values of the carbon equivalent can be the same, but the mechanisms of crystallization of cast iron and its properties do not coincide. The parameters of the distribution of the content of carbon, silicon, manganese, phosphorus, sulfur, carbon equivalent, and the degree of eutecticity in cast iron СЧ350, from which the friction «Khanin wedge» for railway rolling stock is made, were analyzed. Cleaning the factory arrays of indicators of chemical composition, hardness, carbon equivalent, degree of eutecticity of cast irons intended for the production of brake pads and the friction «Khanin wedge» from gross erroneous values practically did not affect the general characteristics of the statistical analysis, which indicates the reliability of the results. It is shown that when smelting in induction crucible furnaces gray synthetic cast iron intended for the production of brake pads and the «Khanin wedge», the ranges of variation in the content of C, Si, Mn, P, S are much narrower than those regulated by the standards for these foundry products. The fundamental possibility of introducing appropriate clarifications to the requirements of the standards regarding the content of chemical elements in synthetic gray cast iron intended for the production of brake pads of the «M» type and the friction «Khanin wedge» for railway rolling stock was noted, in particular, reducing the sulfur content to 0,05 % to increase stability of its quality. Keywords: cast iron, chemical composition, carbon equivalent, degree of eutecticity, properties, castings, brake pads, operational characteristics.

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The effect of microstructure on high-stress abrasion resistance of Fe-Cr-C hardfacing deposits

Morsy

El-Kashif

2014

Weld World

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For example in vehicle or crane production and in the steel construction area-in many areas the weight reduction has a decisive influence on the development of new products. So modern, temperature-sensitive high-performance materials replace more and more unalloyed structural steels. The processing window by welding these materials is much smaller, so that the exact determination and compliance of the t 8/5-value (cooling rate) is important. This is why the welding parameters and the exact determination of specific parameters have a great impact on the calculation and determination of the t 8/5-value as well on the resulting mechanical and technological characteristics. MIZ IIW 28 ZAVARIVANJE I ZAVARENE KONSTRUKCIJE, 1/2017, str. 27-39

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Determining the carbon equivalent of cast iron by the thermo-calc program

Cited by 9 publications

References 1 publication

Research on Tensile Behaviour of New Structural Material MoNiCa

Research on Tensile Behaviour of New Structural Material MoNiCa

Definition of carbon equivalent and degree of eutecticity of cast iron in foundry production

The effect of microstructure on high-stress abrasion resistance of Fe-Cr-C hardfacing deposits

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