Failure of large-diameter steel pipe with rolling scabs

Shinkin, V. N.

doi:10.3103/s0967091217060109

Cited by 20 publications

(4 citation statements)

References 27 publications

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“…Common and standardized methods for optimizing the properties of conventional metal alloys are constantly being improved, but they can rarely be applied to amorphousnanocrystalline structures [5][6][7][8][9]. The attempt to apply standard processing methods leads either to the mechanical destruction of such materials, or to the destruction of their structural state.…”

Section: Introductionmentioning

confidence: 99%

Directed changing properties of amorphous and nanostructured metal alloys with help of nanosecond laser impulses

Ushakov¹,

Safronov²

2021

cisisr

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Section: Introductionmentioning

confidence: 99%

Directed changing properties of amorphous and nanostructured metal alloys with help of nanosecond laser impulses

Ushakov¹,

Safronov²

2021

cisisr

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“…Let E, P and σ y be the modulus of elasticity, modulus of hardening and yield stress of the bar's material [7][8][9][16][17][18].…”

Section: Normal Stresses Of Round Bar In Plastic Bendingmentioning

confidence: 99%

“…The basis of the determination of residual stresses after the plastic deformations is the Genki's theorem about the unloading (1924) [16][17][18][25][26][27]: the residual stresses are equal to the difference between the true stresses in the elastoplastic body and those stresses that would be created in it under the assumption about the ideal elasticity of the body's material.…”

Section: Genki's Theorem About Residual Stressesmentioning

confidence: 99%

Residual Stresses in Elastoplastic Bending of Round Bar

Shinkin

2019

MSF

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Elastoplastic deformation on the presses and high-temperature heating of the steel sheet cause the large residual stresses in the sheet’s and bar’s wall. The technological operations of the obtaining of metal products, their shape and linear dimensions strongly affect on the distribution within the metal and the maximum values of residual stresses. The uneven cooling of various parts of the sheet and bar, obtained by bending, stamping and forging, also leads to the large residual stresses inside the metal. The greatest residual stresses occur in the weld area, where there is a strong heterogeneity of mechanical and physical properties of the metal due to uneven heating and cooling. Below the new analytical method for calculating of the residual stresses of a round steel bar in the elastoplastic bending is obtained. This method takes into account the diameter of the bar, as well as the modulus of elasticity, the yield strength and the hardening modulus of steel’s bar.

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“…It is difficult for powder metallurgy methods to compete in terms of productivity with traditional metallurgical technologies for the production of steel [15][16][17][18][19]. However, the work is actively carried out and the productivity of the methods is increasing every year.…”

Section: Introductionmentioning

confidence: 99%

Enhancing Mechanical Properties of Various Sintered Pellets with Nano-Additives

Nguyên

Konyukhov

Nguyen³

2021

DDF

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The impact of Fe, Co, Ni nano-additives on the density, microhardness and bending strength was investigated for several sintered pellets. Fe, Co, Ni nanopowders (NP) were prepared in the size range 67-94 nm using chemical metallurgy techniques. These powders (0.5 wt. %) were dispersed into three sets of micron powders: Co (+0.5 wt. % Co NP); Fe (+0.5 wt. % Fe NP); Fe+0.5wt. % C (+0.5 wt. % Co and 0.5 wt. % Ni NP). Mixtures were further mixed and processed using a magnetic mill and a turbulent mixer. Sintering was carried out using spark plasma sintering (SPS) as well as pressureless sintering (PS). The densities of sintered pellets were found to increase by 2.5-3% (SPS) and 3-5% (PS) in the presence of nano-additives; corresponding increases in microhardness and bending strength were determined to be 7.9-11.1% and 17.9-38.7%, respectively. These results are discussed in terms enhanced packing due to interparticle sliding and the filling of free spaces with the nanodisperse phase.

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Failure of large-diameter steel pipe with rolling scabs

Cited by 20 publications

References 27 publications

Directed changing properties of amorphous and nanostructured metal alloys with help of nanosecond laser impulses

Directed changing properties of amorphous and nanostructured metal alloys with help of nanosecond laser impulses

Residual Stresses in Elastoplastic Bending of Round Bar

Enhancing Mechanical Properties of Various Sintered Pellets with Nano-Additives

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