NickelMaghrebV1, Main, Exploration, bibRecord, 000C50

Évolution de la morphologie des pores durant la compression isostatique à chaud de poudres sphériques

Identifieur interne : 000C50 ( Main/Exploration ); précédent : 000C49; suivant : 000C51

Évolution de la morphologie des pores durant la compression isostatique à chaud de poudres sphériques

Auteurs : S. Boudrahem [Algérie] ; M. Grosbras [France]

Source :

Matériaux et techniques [ 0032-6895 ] ; 1999.

RBID : Pascal:00-0150207

Descripteurs français

Pascal (Inist)
- Poudre métallique, Pressage isostatique chaud, Superalliage, Morphologie, Alliage base nickel, Densification, Microstructure, Porosité, Métallurgie poudre.

English descriptors

KwdEn :
- Densification, Hot isostatic pressing, Metal powder, Microstructure, Morphology, Nickel base alloys, Porosity, Powder metallurgy, Superalloy.

Abstract

Densification by hot isostatic pressing (HIP) of powders induces pore shape transformations governed by several acting mechanisms such as diffusion, creep and plastic yielding. So a HIPing densification description can be described by a systematic study of the morphological evolution of the porous phase. In this way, pore changing shape of superalloy powders are studied on the basis of the stereological and morphological parameters derived from image analysis. The microstructural study shows that the densification starts by a progressive transformation of the interconnected porosity into isolated pores having an irregular shape. This leads to a large scattering in the pore size. As the process continues, we observe a strengthening in the distribution of the pores size. This is caused by a fragmentation of the largest pores. The final stage of the densification is characterised by a relative homogenization of the pore shape. Pore coalescence can occur in this stage when HIPing parameters does not allow complete densification.

Affiliations:

Links toward previous steps (curation, corpus...)

to stream PascalFrancis, to step Corpus: 000439
to stream PascalFrancis, to step Curation: 000002
to stream PascalFrancis, to step Checkpoint: 000436
to stream Main, to step Merge: 000C85
to stream Main, to step Curation: 000C50

Le document en format XML

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<country>Algérie</country>
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<term>Nickel base alloys</term>
<term>Porosity</term>
<term>Powder metallurgy</term>
<term>Superalloy</term>
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<keywords scheme="Pascal" xml:lang="fr"><term>Poudre métallique</term>
<term>Pressage isostatique chaud</term>
<term>Superalliage</term>
<term>Morphologie</term>
<term>Alliage base nickel</term>
<term>Densification</term>
<term>Microstructure</term>
<term>Porosité</term>
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<front><div type="abstract" xml:lang="en">Densification by hot isostatic pressing (HIP) of powders induces pore shape transformations governed by several acting mechanisms such as diffusion, creep and plastic yielding. So a HIPing densification description can be described by a systematic study of the morphological evolution of the porous phase. In this way, pore changing shape of superalloy powders are studied on the basis of the stereological and morphological parameters derived from image analysis. The microstructural study shows that the densification starts by a progressive transformation of the interconnected porosity into isolated pores having an irregular shape. This leads to a large scattering in the pore size. As the process continues, we observe a strengthening in the distribution of the pores size. This is caused by a fragmentation of the largest pores. The final stage of the densification is characterised by a relative homogenization of the pore shape. Pore coalescence can occur in this stage when HIPing parameters does not allow complete densification.</div>
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Évolution de la morphologie des pores durant la compression isostatique à chaud de poudres sphériques

Évolution de la morphologie des pores durant la compression isostatique à chaud de poudres sphériques

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri