Study of Sintering of Iron Powder Bars Processed by Equal Channel Angular Pressing

Mônica Paula Ribeiro; Marcio Ferreira Hupalo; Selauco Vurobi; Osvaldo Mitsuyuki Cintho

doi:10.4028/www.scientific.net/MSF.802.404

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HomeMaterials Science ForumMaterials Science Forum Vol. 802Study of Sintering of Iron Powder Bars Processed...

Study of Sintering of Iron Powder Bars Processed by Equal Channel Angular Pressing

Abstract:

The main aim of this work is to show porosity evolution during application of various processing conditions to a high-purity (99.7 wt.%) iron powder, including compacting, sintering and equal channel angular pressing (ECAP). Iron powder bars with dimensions of 8x8x30 mm and 8x8x10 mm were axially pressed with pressures ranging from 100MPa to 250MPa, followed by sintering at 1100oC during 30 minutes under argon atmosphere. Sintered bars were processed by ECAP at room temperature in a single pass, using a SAE 1045 steel die with an internal angle of 120o. Microstructural characterization was performed by light optical microscopy (LOM) and quantitative stereology. ECAP processing resulted in a substantial reduction in the porosity levels for specimens pressed at 100 MPa and 150 MPa. The sample compacted with 150MPa and processed by ECAP with back-pressure showed the lowest volume fraction of porosity. Higher compacting pressures caused an increase in porosity levels. This result is explained by presence of cracks prior to ECAP and the concurrent action of severe stress-strain states during extrusion.

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Periodical:

Materials Science Forum (Volume 802)

Pages:

404-408

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.802.404

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Online since:

December 2014

Authors:

Mônica Paula Ribeiro*, Marcio Ferreira Hupalo, Selauco Vurobi, Osvaldo Mitsuyuki Cintho

Keywords:

Equal-Channel Angular Pressing, High-Purity Iron, Powder metallurgy, Severe Plastic Deformation

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