Effect of TiC Contents on Mechanical Properties and Wear Resistance of Iron-Based Composites
Received date: 2018-08-16
Revised date: 2019-04-13
Online published: 2019-05-06
Supported by
National International Science and Technology Cooperation Project((No.2015DFR50990));International Technology Cooperation Project of Qinghai Province(Nos.2014-HZ-819 and 2015-HZ-811)
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.
Key words： in situ reaction; TiC/Fe composite; mechanical property; wear resistance
Hulin DONG , Haiping BAO , Jianhong PENG . Effect of TiC Contents on Mechanical Properties and Wear Resistance of Iron-Based Composites[J]. Acta Metall Sin, 2019 , 55(8) : 1049 -1057 . DOI: 10.11900/0412.1961.2018.00373
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