Relationships between Porosity and Elastic Modulus of Sintered Copper-Nickel Alloys Made from Mixed and Mechanically Alloyed Powders

Hirose, Norimitsu; Tanaka, Shin‐ichi; Tanaki, Toshiyuki; Asami, Junichi

doi:10.1299/kikaia.69.1033

Cited by 3 publications

(1 citation statement)

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“…Thus, Young's modulus of porous and fully dense materials should be considered as the contribution of porosity to fatigue strength. Currently, the density of porous materials and Young's modulus have been established based on experience, while the MacAdam model directly gives the relationship between density and Young's modulus [34]. Fractography of cyclically loaded fracture samples revealed that cracks were preferably originated at large pores, indicating the constant C is 1.41 as edge defects [7], while the size and geometry of pores were considered as main factors in the new formula.…”

Section: Quantitative Analysis Of the Effects Of Porosity And Phase C...mentioning

confidence: 99%

Fatigue Behavior of Alloy Steels Sintered from Pre-Alloyed and Diffusion-Bonding Alloyed Powders

Tan

Liu

Huang³

et al. 2022

Metals

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Porosity and phases are considered to be two key factors for the fatigue performance of powder metallurgy steels. In this paper, the fatigue strengths of the alloy steels sintered from two typical types of powders, pre-alloyed Fe-Cr-Mo (Astaloy CrM), and diffusion-bonding alloyed Fe-Cu-Mo-Ni (Distaloy AE), were comparatively analyzed in view of the geometry of porosity, the phases constitution, and fractography of fracture. Different modes of fatigue fracture were distinguished between the two materials. Namely, a trans-particle fracture is predominant in the Disitaloy AE steel due to the heterogeneous phases which consist of soft phases in powder interior and hard phases along powder borders. In contrast, the fatigue fracture of the Astaloy CrM steel with a homogeneous mono-phase of martensite is characterized by an inter-particle fracture at the sintering necks. Moreover, the fatigue endurance limit of the Distaloy AE steel was not pronouncedly improved by increasing sintering temperature in comparison with the Astaloy CrM steel. This was attributed to the softening of the network constructed by martensite at sintering necks. A modified Murakami model which considers micro-scale defect and micro-hardness is effective to predict the fatigue performance of the alloy steels sintered from pre-alloyed and diffusion-bonding alloyed powders, respectively.

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Section: Quantitative Analysis Of the Effects Of Porosity And Phase C...mentioning

confidence: 99%

Fatigue Behavior of Alloy Steels Sintered from Pre-Alloyed and Diffusion-Bonding Alloyed Powders

Tan

Liu

Huang³

et al. 2022

Metals

View full text Add to dashboard Cite

show abstract

The Relationship between Elastic Modulus and Porosity of Sintered Fe-Cu System Alloys

Hirose

Tanaka²,

Tanaki

et al. 2004

J. Jpn. Soc. Powder Powder Metallurgy

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Simulation applied to compaction process in sintered components for product performance optimization

Nunes,

Colosio,

Rodrigues

et al. 2024

SAE Technical Paper Series

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<div class="section abstract"><div class="htmlview paragraph">Sintered parts mechanical properties are very sensitive to final density, which inevitable cause an enormous density gradient in the green part coming from the compaction process strategy. The current experimental method to assess green density occurs mainly in set up by cutting the green parts in pieces and measuring its average density in a balance using Archimedes principle. Simulation is the more accurate method to verify gradient density and the main benefit would be the correlation with the critical region in terms of stresses obtained by FEA and try to pursue the optimization process. This paper shows a case study of a part that had your fatigue limit improved 1000% using compaction process simulation for better optimization.</div></div>

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Relationships between Porosity and Elastic Modulus of Sintered Copper-Nickel Alloys Made from Mixed and Mechanically Alloyed Powders

Cited by 3 publications

References 0 publications

Fatigue Behavior of Alloy Steels Sintered from Pre-Alloyed and Diffusion-Bonding Alloyed Powders

Fatigue Behavior of Alloy Steels Sintered from Pre-Alloyed and Diffusion-Bonding Alloyed Powders

The Relationship between Elastic Modulus and Porosity of Sintered Fe-Cu System Alloys

Simulation applied to compaction process in sintered components for product performance optimization

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