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Reinforced Pores in Porous Steels Obtained with Matrix Soluble Space Holders

Published online by Cambridge University Press:  14 October 2019

G.O. Neves Open the ORCID record for G.O. Neves [Opens in a new window] ,
G. Paz ,
N. Araya ,
C. Binder  and
A.N. Klein
G.O. Neves*
Affiliation:
Universidade Federal de Santa Catarina, Laboratório de Materiais, Campus Trindade, Florianópolis, SC88040-900, Brazil.
G. Paz
Affiliation:
Universidade Federal de Santa Catarina, Laboratório de Materiais, Campus Trindade, Florianópolis, SC88040-900, Brazil.
N. Araya
Affiliation:
Universidade Federal de Santa Catarina, Laboratório de Materiais, Campus Trindade, Florianópolis, SC88040-900, Brazil.
C. Binder
Affiliation:
Universidade Federal de Santa Catarina, Laboratório de Materiais, Campus Trindade, Florianópolis, SC88040-900, Brazil.
A.N. Klein
Affiliation:
Universidade Federal de Santa Catarina, Laboratório de Materiais, Campus Trindade, Florianópolis, SC88040-900, Brazil.
*
*(Email: [email protected])
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Abstract

This paper presents a novel way to obtain reinforced pores by the dissociation of mixed carbides during sintering. Porous materials have a wide range of applications such as dampeners, light structures, etc. But usually pores act as points of stress concentration and crack nucleation, harming the mechanical properties of these materials. Methods have been developed to control the shape and size of pores but, until now, there are no techniques that allow reinforcing the material around the pores. To address this, steels were prepared by adding 1, 3 and 5 wt.% of Mo1.5Cr0.5C mixed carbide particles to a iron matrix by metal injection moulding. The results showed that during sintering, the dissociation of the carbide followed by the dissolution of the elements in the matrix generated rounded secondary pores with a reinforced vicinity, which increased the mechanical strength of the materials. The presence of rounded pores encircled by an enriched vicinity can allow the production of porous materials with exceptional fatigue strength and fracture toughness.

Keywords

powder metallurgyporositysintering
Type
Articles
Information
MRS Advances , Volume 4 , Issue 54: International Materials Research Congress XXVIII , 2019 , pp. 2959 - 2967
Copyright
Copyright © Materials Research Society 2019 

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