Al-Sayed Ali Samar Reda, Hussein Abdel Hamid Ahmed, Nofal Adel Abdel Menam Saleh, Hasseb Elnaby Salah Elden Ibrahim, Elgazzar Haytham Abdelrafea, Sabour Hassan Abdel
National Institute of Laser Enhanced Sciences (NILES), Cairo University, Giza 12611, Egypt.
Faculty of Engineering, Cairo University, Giza 12611, Egypt.
Materials (Basel). 2017 Oct 15;10(10):1178. doi: 10.3390/ma10101178.
Laser cladding process was performed on a commercial Ti-6Al-4V (α + β) titanium alloy by means of tungsten carbide-nickel based alloy powder blend. Nd:YAG laser with a 2.2-KW continuous wave was used with coaxial jet nozzle coupled with a standard powder feeding system. Four-track deposition of a blended powder consisting of 60 wt % tungsten carbide (WC) and 40 wt % NiCrBSi was successfully made on the alloy. The high content of the hard WC particles is intended to enhance the abrasion resistance of the titanium alloy. The goal was to create a uniform distribution of hard WC particles that is crack-free and nonporous to enhance the wear resistance of such alloy. This was achieved by changing the laser cladding parameters to reach the optimum conditions for favorable mechanical properties. The laser cladding samples were subjected to thorough microstructure examinations, microhardness and abrasion tests. Phase identification was obtained by X-ray diffraction (XRD). The obtained results revealed that the best clad layers were achieved at a specific heat input value of 59.5 J·mm. An increase by more than three folds in the microhardness values of the clad layers was achieved and the wear resistance was improved by values reaching 400 times.
采用碳化钨-镍基合金粉末混合物，在商用Ti-6Al-4V（α + β）钛合金上进行激光熔覆工艺。使用功率为2.2千瓦的连续波Nd:YAG激光器，通过同轴喷射喷嘴与标准送粉系统相结合。成功地在该合金上进行了由60 wt%碳化钨（WC）和40 wt% NiCrBSi组成的混合粉末的四轨沉积。硬质WC颗粒的高含量旨在提高钛合金的耐磨性。目标是使硬质WC颗粒均匀分布，无裂纹且无孔隙，以提高此类合金的耐磨性。这是通过改变激光熔覆参数以达到有利于获得良好力学性能的最佳条件来实现的。对激光熔覆样品进行了全面的微观结构检查、显微硬度和磨损试验。通过X射线衍射（XRD）进行相鉴定。所得结果表明，在特定热输入值59.5 J·mm时获得了最佳熔覆层。熔覆层的显微硬度值提高了三倍多，耐磨性提高了400倍。
