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Acta Metall Sin  2019, Vol. 55 Issue (8): 1049-1057    DOI: 10.11900/0412.1961.2018.00373
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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
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.

Key words:  in situ reaction      TiC/Fe composite      mechanical property      wear resistance     
Received:  16 August 2018     
ZTFLH:  TB333  
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)

URL: 

https://www.ams.org.cn/EN/10.11900/0412.1961.2018.00373     OR     https://www.ams.org.cn/EN/Y2019/V55/I8/1049

Fig.1  XRD spectra of pure grey cast iron and TiC particle reinforced iron-based composite materials
Fig.2  SEM images of TiC particle reinforced iron-based composite materials 20%TiC/Fe (a), 30%TiC/Fe (b), 40%TiC/Fe (c), 50%TiC/Fe (d), and EDS of zone A (e) and zone B (f) in the enlarged view (inset) of Fig.2c
Sampleρt / (g·cm-3)ρm / (g·cm-3)ρr / %Porosity / %
20%TiC/Fe7.2406.77893.626.38
30%TiC/Fe6.7256.35294.455.55
40%TiC/Fe6.2586.04296.543.46
50%TiC/Fe5.9905.46491.218.79
Table 1  Densification of in situ TiC particle reinforced iron-based composites
Fig.3  Rockwell hardnesses of in situ TiC particle reinforced iron-based composites
Fig.4  Compressive stress-strain curves of in situ TiC particle reinforced iron-based composites and pure grey cast iron
Fig.5  Photos of pure grey cast iron (a) and in situ TiC particle reinforced iron-based composites 20%TiC/Fe (b), 30% TiC/Fe(c), 40%TiC/Fe (d) and 50%TiC/Fe (e) after compressive testing (h—height)
Load / kgPure grey iron20%TiC/Fe30%TiC/Fe40%TiC/Fe50%TiC/Fe
0.50.00590.00560.00370.00250.0045
1.00.00890.00790.00450.00360.0053
1.50.01050.00840.00470.00390.0061
2.00.01130.00860.00520.00440.0067
2.50.01160.00870.00660.00540.0077
Table 2  Volume losses of pure grey cast iron and in situ TiC particle reinforced iron-based composites
Load / kg20%TiC/Fe30%TiC/Fe40%TiC/Fe50%TiC/Fe
0.51.061.592.331.70
1.01.111.982.481.75
1.51.392.382.671.90
2.01.122.062.481.45
2.51.341.512.161.75
Table 3  Relative abrasive wear resistance of in situ TiC particle reinforced iron-based composite materials
Fig.6  SEM images of the worn surfaces of pure grey casting iron (a) and in situ TiC particle reinforced iron-based composite materials 20%TiC/Fe (b), 30%TiC/Fe (c), 40%TiC/Fe (d) and 50%TiC/Fe (e) under load of 2.5 kg (Arrows show the wear directions)
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