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Effect of TiC Contents on Mechanical Properties and Wear Resistance of Iron-Based Composites |
Hulin DONG,Haiping BAO,Jianhong PENG( ) |
Department of Physics and Electron Information Engineering, Qinghai University for Nationality, Xining 810007, China |
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Cite this article:
Hulin DONG,Haiping BAO,Jianhong PENG. Effect of TiC Contents on Mechanical Properties and Wear Resistance of Iron-Based Composites. Acta Metall Sin, 2019, 55(8): 1049-1057.
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Abstract The TiC particle reinforced iron-based composite materials were prepared by mechanical alloying (MA) and vacuum hot-pressing (HPing) using titanium (99.9%, 75 μm), graphite (>99.9%, 10 μm) and grey cast iron (>99.5%, 25 μm) powders as starting materials. And TiC particles were also in situ synthesized during HPing. The phase composition, microstructures and distribution of TiC of as-fabricated composite materials were investigated using XRD and FESEM equipped with EDS. The density, hardness, compressive stress-strain and two-body abrasive wear behavior of as-fabricated composite materials were tested using densitometer, rockwell hardness tester, electro-mechanical universal testing machines and pin-on-disk type two body abrasive wear tester, respectively. The results confirm that the in situ synthesized TiC particulate reinforced iron-based composite materials only have TiC and α-Fe phases when sintered at 1200 ℃ for 60 min at the pressure of 70 MPa. The TiC particles were dispersed homogeneously in the iron matrix. The composite with TiC content of 40% (TiC40/Fe) possesses the best comprehensive performance among all as-produced TiC/Fe composites. Its relative density and hardness are 94% and 34 HRC (without heat treatment), respectively. And the compressive property of the TiC40/Fe composite is the best too. Its elastic modulus, yield strength, maximum compressive strength and fracture strain are 19.6 GPa, 420 MPa, 605 MPa and 6.1%, respectively. The TiC40/Fe composite has the best wear resistance, especially at 1.5 kg load, its relative wear resistance is 2.67 times higher than that of pure grey casting iron.
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Received: 16 August 2018
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Fund: National International Science and Technology Cooperation Project((No.2015DFR50990));International Technology Cooperation Project of Qinghai Province(Nos.2014-HZ-819 and 2015-HZ-811) |
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