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2013•Acta Metallurgica Slovaca - ConferenceRequires access

HARDNESS OF SINTERED PM MATERIALS WITH MICROGRADIENTS IN COMPOSITION

A. Zeleňák, Miriam Kupková, Jordan Georgiev, Renáta Oriňáková

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Abstract

Particles of iron powder were electrolytically coated with a copper and subsequently with a hydrocarbon. Coated powder was compressed into cylindrical samples at 600 MPa and sintered at 1120°C. Using Microhardness Tester LECO LM-700AT, Vickers microhardness of samples has been investigated by indenting the unetched metallographic polished section. Test loadings were 10g, 25g, 50g, 100g, 200g, 300g, 500g and 1000g. Loading time was set on 10 seconds. It was found that there are different values of microhardness within a grain. Microhardness measurements taken at different points in the specimen enabled us to map the occurrence of various hardness values, which reflects a variety of the local microstructure of the examined material. At large loading, effective properties of a large volume of material are measured and the range of measured hardness narrows. ISE was observed.

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What this paper is about

Particles of iron powder were electrolytically coated with a copper and subsequently with a hydrocarbon. Coated powder was compressed into cylindrical samples at 600 MPa and sintered at 1120°C. Using Microhardness Tester LECO LM-700AT, Vickers microhardness of samples has been investigated by indenting the unetched metallographic polished section. Test loadings were 10g, 25g, 50g, 100g, 200g, 300g, 500g and 1000g. Loading time was set on 10 seconds. It was found that there are different values of microhardness within a grain. Microhardness measurements taken at different points in the specimen enabled us to map the occurrence of various hardness values, which reflects a variety of the local microstructure of the examined material. At large loading, effective properties of a large volume of material are measured and the range of measured hardness narrows. ISE was observed.

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Available abstract

Particles of iron powder were electrolytically coated with a copper and subsequently with a hydrocarbon. Coated powder was compressed into cylindrical samples at 600 MPa and sintered at 1120°C. Using Microhardness Tester LECO LM-700AT, Vickers microhardness of samples has been investigated by indenting the unetched metallographic polished section. Test loadings were 10g, 25g, 50g, 100g, 200g, 300g, 500g and 1000g. Loading time was set on 10 seconds. It was found that there are different values of microhardness within a grain. Microhardness measurements taken at different points in the specimen enabled us to map the occurrence of various hardness values, which reflects a variety of the local microstructure of the examined material. At large loading, effective properties of a large volume of material are measured and the range of measured hardness narrows. ISE was observed.

Key concepts: Indentation hardness, Materials science, Microstructure, Vickers hardness test, Metallurgy, Composite material

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