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    Dry sliding wear behaviour of Fe-0.4C-25Cr-XNi cast steels
    (Elsevier Science Sa, 2006) Sun, Y.; Ahlatci, H.; Ozdogru, E.; Cimenoglu, H.
    The effect of composition and heat treatment (solutionizing at 1200 degrees C and aging at 750 degrees C) on the room temperature mechanical properties (hardness and impact toughness) and dry sliding wear resistance of Fe-0.4C-25Cr-XNi steels (where nominal Ni contents were 4, 12 and 20 wt.%) have been investigated. The steel containing 4 wt.% Ni had ferritic and others (12 and 20 wt.% Ni) had austenitic matrixes along with M23C6 type chromium carbides. The applied heat treatment resulted in precipitation of sigma phase in austenitic matrix, which was accompanied by an improvement in hardness and a decrease in impact toughness. Ferritic matrix steel exhibited higher hardness and lower impact toughness than austenitic matrix steels. The results of the wear tests conducted on an unlubricated M2 quality tool steel disc revealed that at test pressures lower than 2.2 N/mm(2), the dominant wear mechanism was mild wear. However, at high test pressures (> 2.2 N/mm(2)) severe wear mechanism was operative. Increase of hardness and decrease of toughness resulted in a decrease in wear resistance under mild wear conditions. However, these mechanical properties were not effective on wear resistance under severe wear testing conditions. (c) 2005 Elsevier B.V. All rights reserved.
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    Effect of the particle size on the mechanical properties of 60 vol.% SiCp reinforced Al matrix composites
    (Walter De Gruyter Gmbh, 2002) Ahlatci, H.; Candan, E.; Cimenoglu, H.
    The effect of the reinforcing particle size on the mechanical properties of 60 vol.% SiC reinforced aluminium matrix composites produced by the pressure infiltration technique was examined by compression, impact and wear tests. The compression strength and the impact resistance decreased with increasing reinforcing particle size. The composites exhibited different abrasion behaviour depending on the size of abrasive Al2O3 grains. On fine abrasive Al2O3 grains (85 mu m), the abrasion resistance increased with increasing reinforcing SiC particle size. The contrary result was obtained on coarse abrasive Al2O3 grains (250 mu m). The wear tests conducted on M2 quality tool steel revealed that reinforcing of aluminium with coarse SiC particles has a very beneficial effect on the wear resistance with respect to fine reinforcing SiC particles.