| XIONG Zhong,WANG Yan,XU Qiang,HE Qin.Effects of TiC on Microstructure and Properties of Fe-based Alloy Spray-welding Layer[J],46(8):79-84 |
| Effects of TiC on Microstructure and Properties of Fe-based Alloy Spray-welding Layer |
| Received:March 29, 2017 Revised:August 20, 2017 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2017.08.013 |
| KeyWord:TiC Fe-based alloy spray welding layer microhardness wear resistance |
| Author | Institution |
| XIONG Zhong |
School of Materials Science and Engineering, Xihua University, Chengdu , China |
| WANG Yan |
School of Materials Science and Engineering, Xihua University, Chengdu , China |
| XU Qiang |
School of Materials Science and Engineering, Xihua University, Chengdu , China |
| HE Qin |
School of Materials Science and Engineering, Xihua University, Chengdu , China |
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| Abstract: |
| The work aims to study effects of different TiC content on microstructure and properties of Fe-based spray welding layer. The Fe-based spray welding layer was prepared on the surface of Q235 by plasma spray welding technology. Phase, microstructure, microhardness and wear resistance of the spray welding layer was tested with X-ray diffractometer, metallographic microscope, microhardness tester and abrasive wear tester, respectively. The TiC-free spray welding layer was mainly composed of martensite, austenite, (Fe,Cr)7C3 and (Fe,Ni) solid solution, new phases including TiC and TiB2 were present after different content of TiC was added, but diffraction intensity of each sample reduced to a certain degree, and diffraction peaks even disappeared in some areas. With the increase of TiC content, both hardness and wear resistance of the spray welding layer increased but decreased when TiC addition reached a certain extent (wTiC> 3.0%). When the content of TiC was up to 3%, the spray welding layer features in dense microstructure, refined grains and dispersedly distributed TiC, the particles strengthened dispersion and grain refining on the spray welding layer. The microhardness was up to 843HV0.5, about 300HV0.5 higher than that of the non-TiC spray welding layer, relative wear resistance of the layer was about 12 times higher than that of the Q235 steel, both microhardness and wear resistance of the layer were improved significantly. Adding appropriate amount of TiC particles realizes favorable match between the metal substrate and hard phase, thus guaranteeing high hardness and good wear resistance of spray welding layer. |
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