扫描速度对激光熔覆钛合金复合涂层显微组织的影响
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摘要
通过选择合适的激光扫描速度,提高钛合金表面激光熔覆层的质量。在Nd:YAG激光器上采用不同的扫描速度进行熔覆实验,在Ti-6A1-4V合金表面预置Ti和B混合粉末,制备出原位自生的TiB金属陶瓷复合涂层,并对其进行XRD物相分析、显微组织观察及显微硬度分析。涂层主要是由Ti和TiB物相组成,钛合金基体呈现枝晶状或鱼骨状形貌,TiB以胞晶或颗粒状分布在呈枝晶状的Ti周围。随着扫描速度的增加,涂层的硬度也越来越高,但熔覆层深度降低。在不同扫描速度下,熔覆层均与基体呈现良好的冶金结合。存在着增强相的弥散强化作用,熔覆层的硬度得到提高。
The quality of the cladding layer on Ti alloy surface improves by selecting suitable laser scanning speed.The cladding experiments were carried out by using Nd ∶YAG under different scanning speeds. Ti and B mixed powders were preset on the surface of Ti-6 Al-4 V alloy. In-situ TiB composite coatings were prepared. XRD analysis, SEM morphology observation and hardness analysis of the coatings were investigated. The coating is mainly composed of titanium and TiB phases. Ti alloy matrix is dendritic or fishbone morphology. TiB distributes around the dendritic Ti,which is white peritectic and particle shape. With the increase of scanning speed, the hardness of the coating becomes higher and higher; but the thickness of the cladding layer decreases. The cladding layers show a good metallurgical bonding with the substrate at different scanning speeds. With the increase of the laser scanning speed, there is a dispersion strengthening effect of the reinforcement phase, and the hardness of the laser cladding layer improves.
The quality of the cladding layer on Ti alloy surface improves by selecting suitable laser scanning speed.The cladding experiments were carried out by using Nd ∶YAG under different scanning speeds. Ti and B mixed powders were preset on the surface of Ti-6 Al-4 V alloy. In-situ TiB composite coatings were prepared. XRD analysis, SEM morphology observation and hardness analysis of the coatings were investigated. The coating is mainly composed of titanium and TiB phases. Ti alloy matrix is dendritic or fishbone morphology. TiB distributes around the dendritic Ti,which is white peritectic and particle shape. With the increase of scanning speed, the hardness of the coating becomes higher and higher; but the thickness of the cladding layer decreases. The cladding layers show a good metallurgical bonding with the substrate at different scanning speeds. With the increase of the laser scanning speed, there is a dispersion strengthening effect of the reinforcement phase, and the hardness of the laser cladding layer improves.
引文
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[11]Li M, Huang J, Zhu Y, et al. Effect of heat input on the microstructure of in-situ synthesized TiN-TiB/Ti Based composite coating by laser cladding[J]. Surface and Coatings Technology, 2012,206(19/20):4021-4026.
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[13]Lin Yinghua, Lei Yongping, Li Xueqiao, et al. A study of TiB2/TiB gradient coating by laser cladding on titanium alloy[J]. Optics and Lasers in Engineering,2016,82(7):48-55
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[2]王慧萍,李军,张光钧,等.钛合金表面激光熔覆TiC复合涂层显微组织的研究[J].机械制造,2009,47(11):40-42.
[3]杨森,钟敏霖,刘文今,等.激光熔覆制备原位自生TiC颗粒强化Ni基合金复合涂层的研究[J].航空材料学报,2002,22(1):26-30.
[4]孙荣禄,杨贤金.TC4表面激光熔覆TiC和TiC-NiCrBSi涂层的微观组织研究[J].应用激光,2005,25(2):93-96.
[5]杨玉玲,张多,陈浩,等.激光熔覆Ti/C混合粉末原位生成TiC的研究[J].应用激光,2008,28(1):6-8.
[6]梁亚静,石力开,初元璋,等.激光熔覆沉积制备原位增强相钛基复合材料[J].有色金属,2008,60(1):25-28.
[7]陈川川.工艺参数对激光熔覆层影响的研究[D].长沙:湖南大学,2013.
[8]朱快乐,张有凤,何力,等.激光熔覆Y2O3-TiB增强钛基涂层摩擦磨损性能研究[J].热加工工艺,2016,45(12):131-133.
[9]黄凤晓,江中浩,刘喜明,等.激光熔覆工艺参数对横向搭接熔覆层结合界面组织的影响[J].光学精密工程,2011,19(2):316-322.
[10]Lin Yinghua, Yao Jianhua, Lei Yongping, et al.Microstructure and properties of TiB2-TiB reinforced titanium matrix composite coating by laser cladding[J].Optics and Lasers in Engineering,2016,86(11):216-217.
[11]Li M, Huang J, Zhu Y, et al. Effect of heat input on the microstructure of in-situ synthesized TiN-TiB/Ti Based composite coating by laser cladding[J]. Surface and Coatings Technology, 2012,206(19/20):4021-4026.
[12]Weng Fei, Chen Chuanzhong, Yu Huijun. Research status of laser cladding on titanium and its alloys:a review[J]. Materials&Design, 2014,58(19/20):412-425.
[13]Lin Yinghua, Lei Yongping, Li Xueqiao, et al. A study of TiB2/TiB gradient coating by laser cladding on titanium alloy[J]. Optics and Lasers in Engineering,2016,82(7):48-55
[14]Amuda M O H, Akinlabi E T, Moolla M. Microstructure evolution in Ti6Al4V alloy laser cladded with Premix Ti+TiB2powders[J].Materials Today:Proceedings,2017,4(2):763-773.