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Microstructure and mechanical properties of powder-injection-molded products of Cu-based amorphous powders and Fe-based metamorphic powders

Title
Microstructure and mechanical properties of powder-injection-molded products of Cu-based amorphous powders and Fe-based metamorphic powders
Authors
Kim, CKSon, CYHa, DJYoon, TSLee, SKim, NJ
POSTECH Authors
Lee, SKim, NJ
Date Issued
Jan-2008
Publisher
ELSEVIER SCIENCE SA
Abstract
In the present study, a powder-injection molding (PIM) process was applied to Cu-based amorphous alloy powders and Fe-based metamorphic alloy powders, and microstructure, hardness, and wear resistance of the PIM products were analyzed and compared with those of conventional PIM stainless steel products. Injection-molded Cu-based amorphous powders were hardly sintered even at temperatures just below the melting temperature as most of amorphous phases were replaced by crystalline phases. When Fe-based metamorphic powders were injection-molded and then sintered at 1200 degrees C, completely densified products with almost no pores were obtained. They contained 34 vol.% of (Cr,Fe)(2)B borides dispersed in the austenitic matrix without amorphous phases. Since these (Cr,Fe)(2)B borides were very hard and thermally stable, hardness, high-temperature hardness, and wear resistance of the PIM products of Fe-based metamorphic powders were twice as high as those of conventional PIM stainless steel products. Such property improvement suggested new applicability of the PIM products of Fe-based metamorphic powders to structures and parts requiring excellent mechanical properties. (C) 2007 Elsevier B.V. All rights reserved.
Keywords
powder-injection molding; amorphous alloy; metamorphic alloy; sintering; ELECTRON-BEAM IRRADIATION; GLASS-FORMING ABILITY; BULK METALLIC-GLASS; COMPOSITES; STEEL; RESISTANCE; BEHAVIOR; ALLOYS; LIQUID; PHASE
URI
http://oasis.postech.ac.kr/handle/2014.oak/29356
DOI
10.1016/J.MSEA.2007.
ISSN
0921-5093
Article Type
Article
Citation
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, vol. 476, no. 1-2, page. 69 - 77, 2008-01
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 LEE, SUNG HAK
Dept of Materials Science & Enginrg
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