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姚小春,石玗,李廷取,李文生.钛合金激光表面氮化层成形特征及分析[J].稀有金属材料与工程(英文),2019,48(12):4060~4067.[YaoXiaochun,Shi Yu,Li Tingqu and Li Wensheng.Forming Characteristics and Analysis of Nitrided Layers during the Laser Nitriding titanium Alloy[J].Rare Metal Materials and Engineering,2019,48(12):4060~4067.]
Forming Characteristics and Analysis of Nitrided Layers during the Laser Nitriding titanium Alloy
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Received:September 06, 2018  Revised:November 28, 2018
Key words: laser nitriding  titanium alloy  surface morphology  molten pool geometry  forming coefficient
Foundation item:国家自然科学基金( 51675256)、甘肃省基础研究创新群体计划项目(17JR5RA107)、甘肃省高校协同创新团队项目(2017C-07)
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YaoXiaochun,Shi Yu,Li Tingqu and Li Wensheng  
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      Ti-6Al-4V alloy was nitrided in nitrogen atmosphere using diode laser, in order to study the influence of line energy, laser power and scanning speed on the surface morphology, molten pool geometry, width, the penetration depth and the forming coefficient of the nitrided layers, the surface and cross-section pictures of the nitrided layers were taken by optical and scanning electron microscopy, and the hardness was measured by microhardness tester. The results show that the surface morphology are composed of the smooth and rough surface, When the surface temperature of the molten pool is low, increasing the interaction time has little effect on the surface morphology. With the increase of laser power under the same line energy, the melting depth and width of the nitrided layer increases, and the forming coefficient decreases. As the scanning speed decreases under the same laser power, the penetration depth and width increases, and the forming coefficient reduces; When the forming coefficient is very small, the nitrided layers will produce longitudinally distributed crack. The convection form and the strength result in the formation of a hemispherical interface, a finger interface and a W-shaped interface and so on, besides, multiple inflections happen in the slope of the boundaries of molten pool.