Correlation of microstructure with the wear resistance and fracture toughness of hardfacing alloys reinforced with complex carbides |
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Authors: | Seong-Hun Choo Chang Kyu Kim Kwangjun Euh Sunghak Lee Jae-Young Jung Sangho Ahn |
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Affiliation: | (1) Product Design Team, Samsung SDI Co., Ltd., 442-743 Suwon, Korea;(2) Present address: the Center for Advanced Aerospace Materials, Pohang University of Science and Technology, 790-784 Pohang, Korea;(3) the Materials and Processes Research Center, Research Institute of Industrial Science and Technology, 790-330 Pohang, Korea |
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Abstract: | A correlation was made of the microstructure, wear resistance, and fracture toughness of hardfacing alloys reinforced with
complex carbides. The hardfacing alloys were deposited twice on a low-carbon steel substrate by a submerged arc welding (SAW)
method. In order to investigate the effect of complex carbides, different fractions of complex carbide powders included inside
hardfacing electrodes were employed. Microstructural analysis of the hardfaced layer showed that cuboidal carbides, in which
a TiC carbide core was encircled by a WC carbide, and rod-type carbides, in which W and Ti were mixed, were homogeneously
distributed in the bainitic matrix. In the surface layer hardfaced with FeWTiC powders, more complex carbides were formed,
because of the efficient melting and solidification during hardfacing, than in the case of hardfacing with WTiC powders. As
the volume fraction of complex carbides, particularly that of cuboidal carbides, increased, the hardness and wear resistance
increased. In-situ observation of the fracture process showed that microcracks were initiated at complex carbides and that shear bands were
formed between them, leading to ductile fracture. The hardness, wear resistance, and fracture toughness of the hardfacing
alloys reinforced with complex carbides were improved in comparison with high-chromium white-iron hardfacing alloys, because
of the homogeneous distribution of hard and fine complex carbides in the bainitic matrix. |
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