The Structural State and Properties of a Deposited Coating for an Internal Combustion Engine Valve

Пугачева, Н. Б.; Быкова, Т. М.; Trushina, E. B.; Malygina, I. Yu.

doi:10.17804/2410-9908.2018.5.074-085

Cited by 3 publications

(2 citation statements)

References 2 publications

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“…В соответствии с формулами (8,11) получим следующую совместную плотность распределения условия прочности:…”

Section: разрушение в четырех точкахunclassified

“…В задачах механики структурно-неоднородных сред рассматриваются прочностные и деформационные свойства материала на нескольких уровнях структуры, включая микро-и нано-уровни [1][2][3][4][5][6][7][8]. Характеристики случайных свойств микроструктуры используются при моделировании вероятностного процесса деформирования и разрушения материала в конструкциях [2,3,9,10].…”

Section: Introductionunclassified

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The Effect of Damage at an Ensemble of Microstructure Points on the Margin of Safety in Structurally Heterogeneous Materials

Волков¹

2019

DREAM

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Fracture concentration regions are considered in a microstructure under loading. A mathematical model of a micro-heterogeneous medium with random properties of elements is used for the calculations. The initial data in the problem includes the characteristics of the distributions of random elastic moduli and ultimate strengths in the microstructure elements. The microstructure strength condition is a difference between stresses and ultimate strengths for a multitude of points of a given configuration. The probability of stress simultaneously exceeding the ultimate strength in a given set of elements determines the probability of fracture in this ensemble of points and relative damage at the micro level. A multidimensional normal distribution is used to calculate damage. The structure of the correlation matrix of distribution takes into account the kind of the damage concentration region. The relationship between critical microstructure damage and the margin of safety is determined. Examples of calculating the probability of fracture in two, three, and four microstructure elements are given.

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Section: разрушение в четырех точкахunclassified

Section: Introductionunclassified

The Effect of Damage at an Ensemble of Microstructure Points on the Margin of Safety in Structurally Heterogeneous Materials

Волков¹

2019

DREAM

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Influence of high-temperature treatment conditions on the structure and tribological properties of a nickel-based laser clad coating

Соболева¹,

Макаров²

2021

Izv.VUZ. Tsvet. Met.

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Laser cladding featuring by a minimal thermal impact on the substrate is an advanced method of restoring the working dimensions of parts operated under wear conditions. Ni–Cr–B–Si system coatings can be used in parts operated at high temperatures. The research was aimed to study the influence of heating and subsequent cooling conditions during high-temperature treatment on the structural phase state formation features of the coating obtained by PG-SR2 powder laser cladding (chemical composition, wt.%: 14.8Cr; 2.1B; 2.9Si; 2.6Fe; 0.48C; the rest is Ni), and properties achieved in this process (hardness and tribological properties when sliding on the fixed corundum abrasive). Samples with the clad layer were heated at 1050 °С (holding for 1 h) with subsequent cooling in water (which made it possible to record structural transformations under high-temperature heating), in air, in a muffle furnace and in a vacuum furnace. It was shown that the cooling rate during the high-temperature treatment of the laser clad PG-SR2 coating has a significant effect on the formed structure and properties. High-temperature heating leads to a partial diffusive dissolution of Ni3B nickel borides and Cr23C6 chromium carbides in a solid solution and a corresponding decrease in hardness, an increase in abrasive wear intensity and friction coefficient. Cooling rate deceleration from 1050 °C when samples are cooled in air, muffle and vacuum furnaces leads to the release of CrB chromium borides and Ni3Si nickel silicides that were absent in the clad coating structure. High-strength CrB borides with hardness equal to or even higher than that of the corundum abrasive limit the development of the microcutting mechanism during abrasive wear. Large chromium carbides and borides formed during slow cooling in the furnace form wear-resistant frame-like structures. This leads to an increase in hardness and abrasive wear resistance to levels that exceed the features of the original clad coating.

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Effect of Conditions of High-Temperature Treatment on the Structure and Tribological Properties of Nickel-Based Laser-Clad Coating

Соболева

Макаров

2021

Russ. J. Non-ferrous Metals

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The Structural State and Properties of a Deposited Coating for an Internal Combustion Engine Valve

Cited by 3 publications

References 2 publications

The Effect of Damage at an Ensemble of Microstructure Points on the Margin of Safety in Structurally Heterogeneous Materials

The Effect of Damage at an Ensemble of Microstructure Points on the Margin of Safety in Structurally Heterogeneous Materials

Influence of high-temperature treatment conditions on the structure and tribological properties of a nickel-based laser clad coating

Effect of Conditions of High-Temperature Treatment on the Structure and Tribological Properties of Nickel-Based Laser-Clad Coating

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