Microstructure and wear property of TiC particle reinforced composite coatings on H13 steel surface by laser in-situ synthesis

被引：0
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作者：
机构：
[1] School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, Yunnan
来源：
Liu, Hongxi | 1600年 / Science Press卷 / 41期
关键词：
Composite coatings; Friction and wear behavior; In-situ synthesis; Laser cladding; Laser technique; Microstructure;
D O I：
10.3788/CJL201441.1003004
中图分类号：
学科分类号：
摘要：
In-situ TiC particle reinforce composite coating is synthesized on H13 steel surface by laser cladding technique. The phase composition, microstructure, friction and wear behavior and Vickers hardness of composite coating are analyzed using X-ray diffraction (XRD), energy dispersive spectrometer (EDS), optical microscopy (OM), scanning electron microscopy (SEM), wear testing machine and Vickers hardness gage. The results show that the laser cladding composite coating is mainly composed of TiC, Cr7C3 and Fe-Cr phases under the molar ratio of Ti to Cr3C2 of 2.44:1 condition. The content of Cr7C3 phase in coating increases under the molar ratio Ti to Cr3C2 of 2:1 condition, while (Cr, Fe)7C3 phase is found under the molar ratio Ti to Cr3C2 of 2:2.33 condition. SEM and EDS analysis indicate that the microstructure of TiC phase gradually changes from ball shape to lamellar with the increasing of laser power density. The cladding coating surface macro morphology is good and no pores or cracks under the molar ratio Ti to Cr3C2 of 2:2.33 and the laser power density 24.38 kW·cm-2 condition. The highest average Vickers hardness of the laser cladding composite coating is 931.9 HV0.2, which is about 2.21 times higher than that of the H13 steel substrate. The lowest wear weight loss of the composite coating is only 27.2 % of the substrate.
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页数：7
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