Influence of matrix structure on the abrasion wear resistance and toughness of a hot isostatic pressed white iron matrix composite |
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Authors: | E Pagounis V K Lindroos M Talvitie |
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Affiliation: | (1) the Laboratory of Physical Metallurgy and Materials Science, Helsinki University of Technology, 02150 Espoo, Finland;(2) Rauma Materials Technology Oy, 33101 Tampere, Finland |
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Abstract: | The influence of the matrix structure on the mechanical properties of a hot isostatic pressed (hipped) white iron matrix composite
containing 10 vol pct TiC is investigated. The matrix structure was systematically varied by heat treating at different austenitizing
temperatures. Various subsequent treatments were also employed. It was found that an austenitizing treatment at higher temperatures
increases the hardness, wear resistance, and impact toughness of the composite. Although after every different heat treatment
procedure the matrix structure of the composite was predominantly martensitic, with very low contents of retained austenite,
some other microstructural features affected the mechanical properties to a great extent. Abrasion resistance and hardness
increased with the austenitizing temperature because of the higher carbon content in martensite in the structure of the composite.
Optimum impact energy values were obtained with structures containing a low amount of M (M7C3+M23C6) carbides in combination with a decreased carbon content martensite. Structure austenitized at higher temperatures showed
the best tempering response. A refrigerating treatment was proven beneficial after austenitizing the composite at the lower
temperature. The greatest portion in the increased martensitic transformation in comparison to the unreinforced alloy, which
was observed particularly after austenitizing the composite at higher temperatures,1] was confirmed to be mechanically induced. The tempering cycle might have caused some additional chemically induced transformation.
The newly examined iron-based composite was found to have higher wear resistance than the most abrasion-resistant ferroalloy
material (white cast iron). |
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