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基于“光束中空,光内送粉”技术在无保护气氛室条件下成功制备了钛合金熔覆组织。实验结果表明,中空光内送粉技术能够进行钛合金自由成形制造,熔覆层微观组织中未见明显的氧化痕迹和气孔,熔覆层组织呈现柱状晶形态,晶粒尺寸约100μm,亚结构为钛马氏体α′相,硬度约540HV0.2,远高于TC4钛合金基板的硬度360 HV0.2。此外,与TC4钛合金基板具有良好的冶金结合,无气孔和裂纹等缺陷。分析表明,中空激光光内送粉技术利用气阱原理,有效地实现了阻隔熔覆过程中熔池与外界气氛的交互作用,保证了熔池不受高温氧化影响。
Based on “hollow beam, light powder feeding ” technology in the unprotected atmosphere chamber successfully prepared titanium clad structure. The experimental results show that the hollow inner powder feeding technology can be used for the free-form titanium alloy. No obvious oxidation marks and pores are observed in the microstructure of the cladding layer. The microstructure of the cladding layer presents the columnar crystal structure with a grain size of about 100μm. Titanium martensite α ’phase, the hardness of about 540HV0.2, much higher than the TC4 titanium alloy substrate hardness 360 HV0.2. In addition, with TC4 titanium alloy substrate has a good metallurgical bonding, no holes and cracks and other defects. The analysis shows that the hollow laser light powder feeding technology utilizes the air trap principle to effectively realize the interaction between the molten pool and the ambient atmosphere in the process of barrier coating and ensure the molten pool is not affected by the high temperature oxidation.