Effect of anisotropy of properties of nickel alloy on stresses and plastic deformations in weld zone
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Cited by 3 publications
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Improvement of crack resistance of banded supporting rolls is an urgent problem. The work is a study of the mechanism of improvement of deposited metal crack resistance with the aim of development of the process of high-speed surfacing of supporting rolls with low heat input. The method of X-ray structural analysis in diffractometer DRON-3 revealed that the electrode shape and heat input at surfacing have a considerable influence on microdistortions of crystalline lattice, which are responsible for microstresses. The latter lead to intensive formation and propagation of cracks, their initiation mechanism being associated with dislocations. Established regularities were confirmed at measurement of dislocation density by broadening of X-ray lines. Minimum crystalline lattice microdistortions, microstresses and dislocation density are achieved in surfacing with wire and composite electrode at a high speed and with minimum heat input. At increase of surfacing speed and lowering of heat input the rate of heating, cooling and solidification of liquid metal in the weld pool becomes higher, that provides microstructure refinement and increase of deposited metal crack resistance. A process of high-speed surfacing of banded supporting rolls with low heat input was proposed, providing an increase of crack resistance and preventing band failure. 13 Ref., 1 Table, 6 Figures. K e y w o r d s : high-speed surfacing with low heat input, crystalline lattice microdistortions, microstresses, dislocation density, welding stresses, crack resistance, banded supporting rollsSupporting rolls, which prevent sagging and breaking of working rolls, operate under the conditions of high specific stresses, therefore, surfacing of supporting rolls was not performed, particularly, of banded supporting rolls, which are manufactured by placing the band on the axle with interference fit. This results in stresses developing in the band, which may lead to failure. Therefore, improvement of crack resistance of banded supporting rolls is an important scientific-technical problem.High-speed surfacing with a low heat input is an effective technique to improve crack resistance. However, its impact on deposited metal structure and properties has not been studied well enough [1][2][3][4][5][6][7][8].The aim of this research is studying the mechanism of improvement of deposited metal crack resistance and development of the process of high-speed surfacing of banded supporting rolls with low heat input.Electrode shape is one of surfacing process parameters, as the arc moving over the electrode tip, is concentrated in surfacing with wire, and in deconcentrated in surfacing ribbon electrode, depending on the position of which the arc moves along the longitudinal axis, or across the weld pool. Arc movement determines the heat input into the pool, and in constant surfacing mode also the rate of heating and cooling of liquid metal and HAZ. This changes the pool solidification conditions, diffusion processes, structural and phase transformations [5,6], and deposited...
Improvement of crack resistance of banded supporting rolls is an urgent problem. The work is a study of the mechanism of improvement of deposited metal crack resistance with the aim of development of the process of high-speed surfacing of supporting rolls with low heat input. The method of X-ray structural analysis in diffractometer DRON-3 revealed that the electrode shape and heat input at surfacing have a considerable influence on microdistortions of crystalline lattice, which are responsible for microstresses. The latter lead to intensive formation and propagation of cracks, their initiation mechanism being associated with dislocations. Established regularities were confirmed at measurement of dislocation density by broadening of X-ray lines. Minimum crystalline lattice microdistortions, microstresses and dislocation density are achieved in surfacing with wire and composite electrode at a high speed and with minimum heat input. At increase of surfacing speed and lowering of heat input the rate of heating, cooling and solidification of liquid metal in the weld pool becomes higher, that provides microstructure refinement and increase of deposited metal crack resistance. A process of high-speed surfacing of banded supporting rolls with low heat input was proposed, providing an increase of crack resistance and preventing band failure. 13 Ref., 1 Table, 6 Figures. K e y w o r d s : high-speed surfacing with low heat input, crystalline lattice microdistortions, microstresses, dislocation density, welding stresses, crack resistance, banded supporting rollsSupporting rolls, which prevent sagging and breaking of working rolls, operate under the conditions of high specific stresses, therefore, surfacing of supporting rolls was not performed, particularly, of banded supporting rolls, which are manufactured by placing the band on the axle with interference fit. This results in stresses developing in the band, which may lead to failure. Therefore, improvement of crack resistance of banded supporting rolls is an important scientific-technical problem.High-speed surfacing with a low heat input is an effective technique to improve crack resistance. However, its impact on deposited metal structure and properties has not been studied well enough [1][2][3][4][5][6][7][8].The aim of this research is studying the mechanism of improvement of deposited metal crack resistance and development of the process of high-speed surfacing of banded supporting rolls with low heat input.Electrode shape is one of surfacing process parameters, as the arc moving over the electrode tip, is concentrated in surfacing with wire, and in deconcentrated in surfacing ribbon electrode, depending on the position of which the arc moves along the longitudinal axis, or across the weld pool. Arc movement determines the heat input into the pool, and in constant surfacing mode also the rate of heating and cooling of liquid metal and HAZ. This changes the pool solidification conditions, diffusion processes, structural and phase transformations [5,6], and deposited...
Метою роботи є підвищення тріщиностійкості наплавленого металу і розробка процесу високошвидкісного наплавлення на низькій погонній енергії бандажованих опорних валків. Для досягнення поставленої мети розроблено процес підвищення тріщиностійкості за рахунок високошвидкісного наплавлення бандажованих опорних валків на низькій погонній енергії. Відповідно до рівняння процесу розповсюдження тепла при високошвидкісному наплавленні на низькій погонній енергії з підвищенням швидкості наплавлення зменшується тепловкладення, ширина ізотерм плавлення і зона термічного впливу. Розрахунково-експериментальним шляхом встановлено, що при підвищенні швидкості наплавлення в результаті зменшення тепловкладення знижуються деформації і зварювальні напруги, скорочується зона термічного впливу, в якій утворюються холодні тріщини, що запобігає відшаровуванню наплавленого металу. Швидкість розплавлення і кристалізації зростають, зменшується час перебування ванни в рідкому стані, що запобігає витіканню рідкого металу зі зварювальної ванни і покращує формування наплавленого металу. На підставі встановлених закономірностей розроблено процес високошвидкісного наплавлення на низькій погонній енергії, при якому знижуються тепловкладення і зварювальні напруги, скорочується зона термічного впливу і запобігається відшаровування наплавленого металу, підвищуються швидкість розплавлення і кристалізації, зменшується час перебування ванни в рідкому стані і підвищується тріщиностійкість бандажованих опорних валків. Розроблений процес високошвидкісного наплавлення на низькій погонній енергії бандажованих опорних валків забезпечує зниження тепловкладення і зварювальних напруг, зменшення зони термічного впливу, збільшення швидкості розплавлення і кристалізації, підвищення стійкості до утворення тріщин, відсутність відшаровування наплавленого металу та поломок бандажів. Бібліогр. 11, рис. 6.
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