Effect of pores on fracture of iron

Antsiferov, V. N.; Peshcherenko, S. N.; Шацов, А. А.; Maslennikov, N. N.

doi:10.1007/bf01529629

Cited by 8 publications

(5 citation statements)

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“…where N-number of cycles; A and n-coefficients. Fatigue crack growth studies have shown that the coefficient A depending on the strain hardening varies from 1.16 · 10 −5 to 6.77 · 10 −7 ; n exponent reduces from 4.0 (for the degree of cold deformation of 50%) to 2.88 (at baseline) [70]. The stress intensity on the crack top determines stress intensity factor K which is a tension and crack length l function.…”

Section: Influence Of Pores On the Friction And Wear Of Ironmentioning

confidence: 99%

“…For the initial size of the defect, by analogy with [56] a half the diameter of the pores (l 0 = d/2) was taken. The values of d, K IC , and μ were taken from [70].…”

Section: Influence Of Pores On the Friction And Wear Of Ironmentioning

confidence: 99%

“…K IC , d, and μ values were taken from paper [70]. Thus linear intensity of wear is determined by load, hardness, crack growth resistance, structure characteristic element size-pore size, Poisson ratio, and fatigue fracture parameters.…”

Section: Influence Of Pores On the Friction And Wear Of Ironmentioning

confidence: 99%

“…Deformation component of the friction ratio is proportional to the contour pressure with a small exponent, as it observed experimentally. Features were observed only when P = 8.6% (a transition from open to closed porosity occurs), and when P = 4% (a local extremum of the pore size detected) [70]. The porous structure affects the surface deformation in the active area [56], so that the greatest value of the friction ratio is connected with the extreme size of the pores [62].…”

Section: Lubricated Friction and Wear Processesmentioning

confidence: 99%

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Model of Fracture, Friction, and Wear Phenomena of Porous Iron

Шацов

Ryaposov

Larinin

2011

Advances in Tribology

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Mechanical and tribotechnical features of powdered materials are strongly influenced by pore volume, fracture character, impurities, alloying, concentration inhomogeneity, friction conditions, and other factors. Pores also have influence on acceleration of diffusion processes and reduce undercooled austenite resistance. Annealed in hydrogen, ultra pure iron powder was used to study porous iron features. Toughness fracture and tribotechnical features had nonmonotonic dependence from porosity different from all known dependences got from technical iron powders. Researches brought out the fact that in process of porosity reduction by pressing and annealing cycles, the average dimension of porous is changed. According to the analysis of porous structure were created models of friction, wear, and fracture of pure porous iron.

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Section: Influence Of Pores On the Friction And Wear Of Ironmentioning

confidence: 99%

“…For the initial size of the defect, by analogy with [56] a half the diameter of the pores (l 0 = d/2) was taken. The values of d, K IC , and μ were taken from [70].…”

Section: Influence Of Pores On the Friction And Wear Of Ironmentioning

confidence: 99%

Section: Influence Of Pores On the Friction And Wear Of Ironmentioning

confidence: 99%

Section: Lubricated Friction and Wear Processesmentioning

confidence: 99%

See 2 more Smart Citations

Model of Fracture, Friction, and Wear Phenomena of Porous Iron

Шацов

Ryaposov

Larinin

2011

Advances in Tribology

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“…3) exhibit a rotation of the lines of the reference grid, which are broken on intergrain boundaries due to grain boundary slip [10]. It should be noted that other authors have discovered anomalies in the internal friction [11] and some mechanical characteristics [12,13] of powder iron in the range of low porosity.…”

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confidence: 99%

Special features of plastic deformation of porous metals

1996

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The use of powder metals and articles under conditions of considerable external loads and the use of cold treatment of sintered materials require knowledge of the dependence of their characteristics of plastic deformation on the structural parameters. For porous metals such dependences have a complicated form and have not been studied sufficiently well. In this connection, it is of interest to determine the special features of plastic deformation in metals with different porosities. The present work is a description of such an investigation for sintered iron.Some special features of plastic deformation of porous iron have been considered in [l, 2].In the present work the specimens to be tested were prepared by the method of [3] from PZhRV-2 powder with a mean particle size of 80 p.m. In order to obtain different porosities we conducted a single pressing of the specimens to a specified density followed by their heat treatment. By changing the pressing pressure we obtained specimens with a porosity Po = 4 -40%. The heat treatment included sintering of the pressed preforms in vacuum at I 180°C for 2.5 h. It should be noted that changes in the porosity lead to changes in the properties of the metal that are not related to the density under ordinary conditions. Cylindrical specimens IO-12 mm high and 15 mm in diameter were subjected to uniaxial compression at room temperature with a degree of deformation e ranging between 3 and 40%. For comparison, we studied commercial iron melted by the conventional method.For a quantitative analysis of the structural characteristics of the porous specimens after deformation we measured the mean linear sizes of grains (Rg) and intergrain (Re,) intragrain (Rei) pores. These characteristics were determined from micrographs separately along the deformation axis (R") and normal to it (R'L), which allowed us to evaluate the coefficient of anisotropy Ka= R~ /R~. The microstructural analysis was conducted using a NEOPHOT-32 light microscope and a BS-300 electron microscope.We investigated polished sections on cuts of the side surface of the cylindrical specimens. The cuts were polished before the deformation and then a reference grid with a cell of 50 lam was introduced on them by scratching. In order to

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