Influence of complex V, Cu, Ti and B alloying on structural and phase state, mechanical properties and wear resistance of white cast iron

Kolokoltsev, V. M.; Petrochenko, E. V.; Molochkova, O. S.

doi:10.17580/cisisr.2016.01.04

Cited by 7 publications

(7 citation statements)

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“…В условиях гидроабразивного изнашивания износостойкость поверхностей будет тем выше, чем больше карбидов содержится в сплаве. Для повышения износостойкости белых чугунов, кроме наличия карбидов, необходимо обеспечить высокую прочность металлической основы [6,7]. Известно, что интенсивность изнашивания поверхностей максимальная в образцах с перлитной матрицей и минимальная в образцах, которые прошли термообработку на бейнит [8,9].…”

Section: постановка задачиunclassified

Methodical Complex for Investigation Dependencies Between Micro Structure and Macro Properties of Materials and Operating Characteristics of a Products

Орлов¹,

Коротаев²,

Grinberg³

et al. 2018

DSMM

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Аннотация. В работе представлен методический комплекс исследований композиции «покрытиеосновной металл», позволяющий изучить изменение структурных характеристик материала на микро-, мезо-и макроуровнях. Установлено влияние изменений структурного состояния на свойства покрытий и основного материала при обработке рабочих поверхностей чугунных деталей воздушно-плазменным напылением. Проведена экспериментальная оценка физико-механических свойств образцов с покрытиями и изучены особенности их структурообразования. Предложен оптимальный состав порошковой композиции, содержащий самофлюсующиеся твердые сплавы и износостойкие наполнители, который обеспечивает повышенные эксплуатационные свойства в условиях гидроабразивного изнашивания. Установлено, что плазменное напыление покрытия состава 65%ПР-НХ17СР4 + 35%КХНп-30 с последующей термообработкой и оплавлением покрытия приводит к увеличению износостойкости в 1.5-2 раза. Ключевые слова: методы исследования структуры, физико-механические свойства, износостойкие покрытия, плазменное напыление, термообработка.

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Section: постановка задачиunclassified

Methodical Complex for Investigation Dependencies Between Micro Structure and Macro Properties of Materials and Operating Characteristics of a Products

Орлов¹,

Коротаев²,

Grinberg³

et al. 2018

DSMM

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“…In recent research, image analysis, which pays more attention to the shape of carbides, becomes interesting for automatic evaluation to avoid manual errors. [9][10][11][12][13] Two typical shape factors, namely circularity and roundness, are usually used to evaluate carbide microstructures. The first factor as circularity specifies the shape degree as circle-similar, and reported by Gromczyk et al [9] Liu et al [10] and Kolokoltsev et al, [11] to track the carbide microstructure evolution in cast iron.…”

Section: Introductionmentioning

confidence: 99%

“…[9][10][11][12][13] Two typical shape factors, namely circularity and roundness, are usually used to evaluate carbide microstructures. The first factor as circularity specifies the shape degree as circle-similar, and reported by Gromczyk et al [9] Liu et al [10] and Kolokoltsev et al, [11] to track the carbide microstructure evolution in cast iron. The second factor as roundness refers to the ratio of the average radius of corner curvature to radius of the largest inscribed circle, characterizing the particle angularity by Zheng et al [12] and Magdy et al [13] The previous methods are available in describing the geometry feature of carbide, but cannot give a relationship to the actual properties, which is more important in engineering.…”

Section: Introductionmentioning

confidence: 99%

A Novel Classification Method for Carbide Grade by Using a New Shape Factor with Stress Distribution Analysis

Yao,

Cheng,

Fang

et al. 2024

steel research int.

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The carbide gradation related to geometry size and local stress concentration sensitivity significantly impacts the performance of the carburized 16Cr3NiWMoVNbE steel. The conventional metallurgical graphic comparison method by manual comparison is not capable of grading the carbide gradation automatically. A novel method is thus introduced to automatically evaluate the carbide grade by using a new shape factor φsc with stress distribution analysis instead of using the circularity or roundness shape factor which only considers the geometry shape of carbide particles. The logarithm of the stress concentration factor ln(K) is linearly related to the logarithm of the shape factor ln(φsc). The gradient b of the fitted straight line shows sensitivity to the carbide grade. The gradients are b1 = 0.039, b3 = 0.049, and b5 = 0.055 for the three carbide classes from low to high. Furthermore, there is also a linear relationship between hardness in different grades of carbide microstructure and the gradient b.

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“…by ferrosilicon or calcium silicon [1][2][3]. The components operated at increased temperature usually require use of alloyed grey iron containing additionally chromium, nickel, molybdenum and aluminium [1,4,6].…”

Section: Introductionmentioning

confidence: 99%

“…If the cooling rate is increased (what is typical for thin-wall castings), pearlite amount in the structure increased, as well as its dispersity. If the cooling rate is retarded, ferrite amount increased, while pearlite becomes at first medium-laminar and later coarse-laminar, losing substantially its hardness and strength [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Improvement of mechanical properties of iron castings via adjusting of solidification rate

Gabelchenko¹,

Belov²,

Kidalov³

et al. 2020

cisisr

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The work is devoted to improvement of mechanical properties of iron castings via adjusting of the cooling rate without introduction of alloying additives. The new technological solution is suggested; it can be easily adapted to a casting technology. This solution is based on variation of the cooling rate of iron castings within structurally sensitive solidification intervals. For this purpose, the casting mould was initially cooled after pouring, then heated and cooled again. Cooling of the mould during the period of primary austenite crystal forming led to increase of dendrite crystallization rate and was executed using compressed air. Retarding of the cooling rate during the period of eutectic transformation was provided by the mould heating via burning of exothermic carbon-containing additives introduced in a facing layer of sand-clay moulding mix. Burning reaction is accompanied by heat extraction, what steeply retarded the cooling rate within the interval of eutectic transformation. Consequent acceleration of castings cooling within the interval of eutectoid transformation was achieved via repeated air blowing through a worked reaction layer. Adjusted cooling of iron castings allowed to provide the most favourable solidification conditions, taking into account strictly individual requirements for each structurally sensitive temperature intervals. It led to increase of a volumetric part of primary austenite dendrite crystals, to decrease of eutectic transformation overcooling degree, to forming of graphite eutectics and enlargement of dispersity of pearlite component in iron. Consequently, lowering of widespread iron castings rejects takes place, among them chilling, with simultaneous improvement of metal mechanical properties. As a result, the primary and real structures were varied, what had a positive effect on mechanical properties of casting metal. It is shown that use of solidification rate adjustment led to essential increase of metal tensile strength for the experimental casting.

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Influence of complex V, Cu, Ti and B alloying on structural and phase state, mechanical properties and wear resistance of white cast iron

Cited by 7 publications

References 0 publications

Methodical Complex for Investigation Dependencies Between Micro Structure and Macro Properties of Materials and Operating Characteristics of a Products

Methodical Complex for Investigation Dependencies Between Micro Structure and Macro Properties of Materials and Operating Characteristics of a Products

A Novel Classification Method for Carbide Grade by Using a New Shape Factor with Stress Distribution Analysis

Improvement of mechanical properties of iron castings via adjusting of solidification rate

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