Evolution of damage and fracture in two families of Ni–Cu–Mo sinter-hardened steels with various initial porosities

Gilmas, Margaux; Chottin, Jerôme; Dougan, Mark J.; Hug, Éric

doi:10.1016/j.msea.2015.12.028

Cited by 16 publications

(3 citation statements)

References 31 publications

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“…The necks have been considered as the load-bearing sections and pores play a role such as micro notches [28]. As for the sintering of aluminum alloys, it results in the formation of secondary porosity during transient liquid-phase sintering (LPS), which is dependent on the previous formation of a liquid able to migrate away from the site of the prior alloying particles [29,30].…”

Section: Resultsmentioning

confidence: 99%

Different Formation Routes of Pore Structure in Aluminum Powder Metallurgy Alloy

Bidulská

Bidulský²,

Grande

et al. 2019

Materials

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In powder metallurgy (PM), severe plastic deformation (SPD) is a well-known technological solution to achieve interesting properties. However, the occurrence of pores in the final product may limit these properties. Also, for a given type of microstructure, the stereometric parameters of the pore structures, such as shape (represented by Aspect and Dcircle) and distribution (fshape, and fcircle), decisively affect the final properties. The influence of different processing routes (pressing, sintering and equal channel angular pressing (ECAP)) on pore structures in an aluminum PM alloy is discussed. The nature of porosity, porosity evolution and its behavior is explored. The correlation between pore size and morphology is also considered. The final pore structure parameters (Aspect, Dcircle, fshape, and fcircle) of studied aluminum alloys produced by different processing routes depends on the different formation routes.

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Section: Resultsmentioning

confidence: 99%

Different Formation Routes of Pore Structure in Aluminum Powder Metallurgy Alloy

Bidulská

Bidulský²,

Grande

et al. 2019

Materials

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“…Compared to wrought counterparts with the same composition, PM steels with porosity values ranging from 3 to 15 vol.% have lower mechanical properties. [11][12][13] Press and sinter (P&S) processing route is typically applied for high-volume production with part weighing up to 1-2 kg. In this process, density gradient throughout the sample from surface to core is caused by the friction between die walls, punches, and metal particles, thus featuring directional properties.…”

Section: Introductionmentioning

confidence: 99%

“…Compared to wrought counterparts with the same composition, PM steels with porosity values ranging from 3 to 15 vol.% have lower mechanical properties. 11–13…”

Section: Introductionmentioning

confidence: 99%

Consolidation of water-atomized chromium–nickel-alloyed powder metallurgy steel through novel processing routes

Nagaram,

Sundaram,

Gårdstam

et al. 2024

Powder Metallurgy

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When processing powder metallurgy (PM) steels, the conventional press and sinter route can reach a relative density up to 95%, which is insufficient for applications when dynamic mechanical performance is critical. In this study, a novel route is demonstrated consisting of cold isostatic pressing (CIP) followed by sintering and capsule-free hot isostatic pressing (HIP), allowing to achieve full density PM steels. Water-atomized steel powder admixed with 2 wt.% Ni was subjected to CIP and followed by sintering in 90N2/10H2 atmosphere at 1120 and 1250°C, and in vacuum (10−2 mbar) at 1250 and 1350°C, respectively. At the highest explored CIP pressure of 600 MPa, the three high-temperature sintering runs at 1250°C in 90N2/10H2 atmosphere and vacuum, and 1350°C in vacuum resulted in relative density of ∼94% and closed surface pores. This condition with necessary closed porosity then allowed subsequent capsule-free HIP after sintering, resulting in full densification of the components.

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The Influence of Surface Extrusion Densification on the Microstructure and Mechanical Properties of Iron-Based Powder Metallurgy Gears

Shi,

Chen,

Liu

et al. 2024

Powder Metall Met Ceram

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Evolution of damage and fracture in two families of Ni–Cu–Mo sinter-hardened steels with various initial porosities

Cited by 16 publications

References 31 publications

Different Formation Routes of Pore Structure in Aluminum Powder Metallurgy Alloy

Different Formation Routes of Pore Structure in Aluminum Powder Metallurgy Alloy

Consolidation of water-atomized chromium–nickel-alloyed powder metallurgy steel through novel processing routes

The Influence of Surface Extrusion Densification on the Microstructure and Mechanical Properties of Iron-Based Powder Metallurgy Gears

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