Liquid Phase Sintering of Ferrous Powder Metallurgical Materials

Borgström, Henrik; Nyborg, Lars

doi:10.1016/s1006-706x(08)60054-0

Cited by 7 publications

(5 citation statements)

References 3 publications

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“…The more rounded pores are supposed to contribute to the somewhat higher ETF (.2%) than that (,2%) of the samples sinter hardened from 950uC, which gave more irregular pores. 11 Hardness values for material in different conditions 12 X-ray diffraction spectra of Fe-2C-2Si sintered steel after different kinds of processing, i.e. comparison of as sintered condition and different heat treated conditions…”

Section: Discussionmentioning

confidence: 99%

“…3.10 Yield strength, UTS and ETF values for material as follows: as sintered, sinter hardened after 15 min dwell at 950uC,11 sinter hardened after 90 min dwell at 1150uC, post-sintering austenitised and quenched from 950uC and tempered at 550uC and finally post-sintering austenitised and gas quenched from 950uC…”

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confidence: 99%

“…Microstructure of alloys that are a austenitised and quenched from 950uC, b austenitised and quenched from 950uC as well as tempered at 550uC, c austenitised and gas quenched from 950uC and d sinter hardened by gas quenching after 90 min dwell at 1150uC: microstructure that is sinter hardened after 15 min dwell at 950uC is described under Fig.3.10 Yield strength, UTS and ETF values for material as follows: as sintered, sinter hardened after 15 min dwell at 950uC,11 sinter hardened after 90 min dwell at 1150uC, post-sintering austenitised and quenched from 950uC and tempered at 550uC and finally post-sintering austenitised and gas quenched from 950uC…”

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confidence: 99%

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Optimising grey iron powder compacts

et al. 2009

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The grey iron microstructure Fe-2C-2Si powder based compact is tailored by different kinds of in situ and post sintering processing. This has been achieved by combining thermodynamic and kinetics modelling of microstructure development with sintering and controlled heat treatment experiments of tensile test specimens die compacted at 600 MPa. Applying optimised sintering conditions led to a grey iron like microstructure with 95% relative sintered density. Sinter hardening the compacts led to 500 MPa in yield strength and 600 MPa in ultimate tensile strength in combination with ductile fracture. Quenched and tempered condition showed the same strength values, but combined with brittle fracture due to martensitic structure. Pore rounding and partial pore filling by graphite were obtained by austenising isothermal hold during the cooling of the sintering cycle.

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Section: Discussionmentioning

confidence: 99%

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Optimising grey iron powder compacts

et al. 2009

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“…[3,4] The appropriate amount of liquid phase during LPS is known to be 5 to 15 vol pct. [4,5] Among the various alloying elements for LPS, [6][7][8] boron (B) has all the features of an effective sintering enhancer for ferrous systems with high hardenability and mechanical properties, resulting from the eutectic reaction (c-Fe + Fe 2 B fi L). [9][10][11][12][13] Carbon (C) is an indispensable element for P/M alloy steels due to its low cost and high mechanical properties, [14,15] and also facilitates the LPS densification by lowering the temperature of liquid formation.…”

Section: Introductionmentioning

confidence: 99%

Microstructure Modification of Liquid Phase Sintered Fe–Ni–B–C Alloys for Improved Mechanical Properties

You

Kim

Lee

et al. 2021

Metall Mater Trans A

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Powder metallurgy (P/M) has been widely used in automobile, home appliances, and electronic devices, but its uses are very limited due to the low relative density of 85 to 95 pct. The Fe-Ni-B-C alloy system can mitigate the aforementioned issues by the liquid phase sintering, which results in a nearly full densification. However, the boron-containing alloys produced the brittle eutectic phases [Fe 3 (C, B) and Fe 2 B] along the grain boundaries, which are detrimental to the mechanical properties. The main objective of this study is to improve the ductility of boron-containing alloys through the microstructure modification. For this, the volume fraction of solidified phase was optimized by controlling the composition, and the coarsening of solidified a-Fe particles into the pearlite matrix was induced by a post annealing, which reduces the continuous network of eutectic phases and increased the grain continuity. In addition, the effect of microstructure modification on the mechanical properties of Fe-B-C and Fe-Ni-B-C alloys was comparatively investigated. As a result of microstructure modification, the postannealed Fe-1Ni-0.4B-0.8C alloy exhibited a high elongation to failure of 5.2 pct.

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“…To improve densification process of Fe-Cu parts produced using PM technique a sintering process called liquid phase sintering (LPS) is common used. Accordingly, LPS of ferrous materials can be utilized in systems where it is difficult to achieve high density [5]. LPS is a sintering technique in which at least one of the constituents of the powder mix is in liquid state at the sintering temperature, or below the sintering temperature.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and densification behavior of liquid phase sintered Fe-Cu alloy powder using cold and hot compaction techniques

Nassef¹,

Alateyah²,

El-Hadek³

et al. 2017

Adv. Mater. Lett.

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The physical and mechanical properties of atomized prealloyed Fe-Cu powders, blended with different amounts of liquid additions of lead (Pb), were studied in the as-sintered condition and hot compaction techniques. The influence of Pb content, compacting pressure and temperature on the densification, hardness, and the mechanical properties were investigated. During hot compaction, at a temperature of 500°C, the Pb liquid was found to spread uniformly among Fe-Cu solid particles. The effect of pores in Fe-Cu-Pb alloys, generated by sintering with transient liquid phase, had been studied. An attempt was made in order to study the properties of Fe-Cu-Pb particles and their behaviour, with respect to the consolidation of Fe-Cu-Pb powders. The density values of cold and hot compacts, at various pressures and temperatures values, were reported. The microstructure, hardness, and strength measurements were found to be dependent upon the compacting pressure. For the cold compacted alloys, the Pb powder particles were completely melted to form liquid pools. In addition, increasing the Pb content in the alloy matrix revealed a decrease of the pores percentage, hence the sample became denser. On the other hand, grain was found to be coarser and less porosity is obtained with increasing the Pb content in the hot compacted. It is found that, increasing the compacting pressure of the cold and hot compacted samples revealed a homogenous, fine grain, and small pores appeared around the grain boundaries. The mechanical properties data showed improvement in the strength and hardness of the hot and cold compacted samples by increasing either the compaction pressure or temperature.

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Liquid Phase Sintering of Ferrous Powder Metallurgical Materials

Cited by 7 publications

References 3 publications

Optimising grey iron powder compacts

Optimising grey iron powder compacts

Microstructure Modification of Liquid Phase Sintered Fe–Ni–B–C Alloys for Improved Mechanical Properties

Microstructure and densification behavior of liquid phase sintered Fe-Cu alloy powder using cold and hot compaction techniques

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