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In situ fabrication of titanium carbide particulates-reinforced iron matrix composites
Highlights ► Titanium carbide (TiC) particulates are in situ fabricated in the iron matrix. ► A subsequent heat treatment promotes TiC formation. ► The diffusion reaction region extends with increasing heat treatment time. ► Titanium wires have a stronger carbide forming tendency than iron. ► The diffusion reaction region shows the highest microhardness value.
Abstract Titanium carbide (TiC) particulates-reinforced iron matrix composites were prepared by in situ fabrication method combining an infiltration casting with a subsequent heat treatment. The effects of different heat treatment times (0, 1, 6 and 11h) at 1138°C on the phase evolution, microstructural features, and properties of the composites were investigated. The as-prepared composites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and microhardness and wear resistance tests. The XRD results showed that the composites consisted of graphite, α-iron and titanium carbide after heat treatment at 1138°C for 11h. The SEM observation revealed that the formed TiC particulates were homogenously distributed in the iron matrix. The average microhardness of the composite heat treated at 1138°C for 6h increased depending upon the region: 209 HV0.1 (iron matrix)<787 HV0.1 (titanium wire)<2667 HV0.1 (composite region). After being heat treated at 1138°C for 11h, the composite indicated no considerable change in microhardness value, and the average microhardness of the composite region was about 2354 HV0.1. The highest microhardness value obtained for the composite region was due to the formation of titanium carbide particulates as reinforcement phase within the iron matrix. Relative wear resistance was determined by a pin-on-disc wear test technique under different loads, and as a result, the composites containing higher volume fraction of hard titanium carbide particulates presented higher wear resistance compared with the unreinforced gray cast iron.
In situ fabrication of titanium carbide particulates-reinforced iron matrix composites
Highlights ► Titanium carbide (TiC) particulates are in situ fabricated in the iron matrix. ► A subsequent heat treatment promotes TiC formation. ► The diffusion reaction region extends with increasing heat treatment time. ► Titanium wires have a stronger carbide forming tendency than iron. ► The diffusion reaction region shows the highest microhardness value.
Abstract Titanium carbide (TiC) particulates-reinforced iron matrix composites were prepared by in situ fabrication method combining an infiltration casting with a subsequent heat treatment. The effects of different heat treatment times (0, 1, 6 and 11h) at 1138°C on the phase evolution, microstructural features, and properties of the composites were investigated. The as-prepared composites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and microhardness and wear resistance tests. The XRD results showed that the composites consisted of graphite, α-iron and titanium carbide after heat treatment at 1138°C for 11h. The SEM observation revealed that the formed TiC particulates were homogenously distributed in the iron matrix. The average microhardness of the composite heat treated at 1138°C for 6h increased depending upon the region: 209 HV0.1 (iron matrix)<787 HV0.1 (titanium wire)<2667 HV0.1 (composite region). After being heat treated at 1138°C for 11h, the composite indicated no considerable change in microhardness value, and the average microhardness of the composite region was about 2354 HV0.1. The highest microhardness value obtained for the composite region was due to the formation of titanium carbide particulates as reinforcement phase within the iron matrix. Relative wear resistance was determined by a pin-on-disc wear test technique under different loads, and as a result, the composites containing higher volume fraction of hard titanium carbide particulates presented higher wear resistance compared with the unreinforced gray cast iron.
In situ fabrication of titanium carbide particulates-reinforced iron matrix composites
Zhong, Lisheng (author) / Xu, Yunhua (author) / Hojamberdiev, Mirabbos (author) / Wang, Jianbin (author) / Wang, Juan (author)
2011-03-14
6 pages
Article (Journal)
Electronic Resource
English
In situ fabrication of titanium carbide particulates-reinforced iron matrix composites
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| British Library Online Contents | 2013