Properties of porous nickel-base anisotropic materials

Boiko, L. V.; Шаповалов, В. И.; Chernykh, E. A.; Belyi, I. A.; Rastorgueva, I. A.; Martynov, V. P.; Dolzhenkov, V.I.

doi:10.1007/bf00795862

Cited by 14 publications

(13 citation statements)

References 1 publication

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“…On the other hand, formation of elongated gas pores during solidification of metals and alloys were studied by several investigators. [4][5][6][7][8][9][10] Recently, Nakajima and co-workers [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] investigated the fabrication of various porous metals and alloys with elongated pores in pressurised hydrogen, nitrogen or oxygen by a unidirectional solidification method. In order to distinguish the porous metals with elongated directional pores from sintered and foamed metals with rather spherical pores, we designate them lotus-type porous metals, because they look like lotus roots.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Lotus-type Porous Stainless Steel by Unidirectional Solidification under Hydrogen Atmosphere

2002

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Lotus-type porous stainless steel SUS304L has been fabricated by unidirectional solidification under mixed gases of hydrogen and argon. The atmospheric pressure dependence of porosity and pore diameter has been investigated. The porosity is lower if the partial pressure of argon is higher under a constant partial pressure of hydrogen and is higher if the partial pressure of hydrogen is higher under a constant total pressure of atmosphere composing of hydrogen and argon. Average pore diameter increases with increasing distance from the bottom chill plane. From tensile tests, the ultimate tensile strength of the porous stainless steel with porosity about 50% has been found to be about 7 times lower than nonporous alloy in the direction perpendicular to pore growth direction.

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Section: Introductionmentioning

confidence: 99%

Fabrication of Lotus-type Porous Stainless Steel by Unidirectional Solidification under Hydrogen Atmosphere

2002

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“…The Young's modulus of the honeycomb is equal to the Young's modulus of the cell wall solid, Es, scaled by the solid cross-sectional area, or: In a honeycomb with a ductile cell wall material, the honeycomb will fail when the stress in the solid cell walls exceeds the ultimate tensile strength, ots, of the cell wall material. The out-of-plane failure strength, (af*) 3 is therefore defined in the same manner as the yield strength and Young's modulus:…”

Section: Out-of-plane Behavior Of Honeycombsmentioning

confidence: 99%

The tensile strength of porous copper made by the GASAR process

Simone

Gibson

1996

Acta Materialia

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“…[1][2][3] Recently, lotus-type and gasar-type porous metals with many elongated pores and superior mechanical properties than conventional porous materials have been developed. [4][5][6][7][8][9][10][11][12][13][14] The fabrication principle of such porous metals is as follows; the solubility difference of hydrogen, nitrogen or oxygen between the solid and liquid phases can cause gas bubbles during solidification. Elongated pores can be produced by unidirectional solidification using a watercooled hearth as the bottom face of the casting mold.…”

Section: Introductionmentioning

confidence: 99%

Effect of Hydrogen Pressure on Moisture-Based Fabrication of Lotus-Type Porous Nickel

2006

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Lotus-type porous nickel, which has long straight pores aligned in one direction, was fabricated by utilizing moisture during unidirectional solidification in argon atmosphere. We studied the effect of the quantity of hydrogen in the atmosphere on the fabrication of lotus-type porous nickel. Adding hydrogen in the atmosphere, it was expected that the porosity of the lotus-type porous nickel with a smaller pore diameter became larger because not only the moisture but also hydrogen gas in the atmosphere were the supply source of hydrogen bubble. However, in fact, the pore diameter and the porosity of lotus-type porous nickel gradually decreased as the hydrogen partial pressure increased up to a point. When hydrogen was further added to the atmosphere, the pore diameter and porosity increased while the number of pores decreased dramatically. As a result of the fabrication under various pressures, the partial pressure of hydrogen at the border was 0.05 MPa. No moisture can be dissociated when a large amount of hydrogen is dissolved in the molten nickel.

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Properties of porous nickel-base anisotropic materials

Cited by 14 publications

References 1 publication

Fabrication of Lotus-type Porous Stainless Steel by Unidirectional Solidification under Hydrogen Atmosphere

Fabrication of Lotus-type Porous Stainless Steel by Unidirectional Solidification under Hydrogen Atmosphere

The tensile strength of porous copper made by the GASAR process

Effect of Hydrogen Pressure on Moisture-Based Fabrication of Lotus-Type Porous Nickel

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