钛合金表面激光熔覆钴基合金层的组织及力学性能

发布时间：2018-05-30 11:48

本文选题：钛合金 + 激光熔覆　；参考：《材料热处理学报》2015年02期

【摘要】：在TC4钛合金表面利用激光熔覆Co基合金粉末涂层,利用扫描电镜(SEM)、能谱分析仪(EDS)和洛氏硬度计研究涂层的微观组织及力学性能。结果表明:当扫描速度固定为400 mm/s,激光功率为1.3、1.5、1.7 k W熔覆时,涂层与基体之间都实现了冶金结合。其中,激光功率为1.5 k W时熔覆效果最好,熔覆层内组织均匀致密无气孔和裂纹等缺陷。激光功率为1.3 k W时,熔覆层内出现了裂纹。当激光功率固定为1.5 k W,扫描速度为300、350、400 mm/s时,熔覆层和基体的结合情况良好,熔覆层内组织均匀致密无缺陷。随着激光功率和扫描速度的增大,涂层表面硬度呈减小的趋势,但都高于TC4基体硬度的两倍左右,表明在TC4表面激光熔覆Co基合金粉末涂层可以显著提高其硬度。
[Abstract]:Laser cladding Co-based alloy powder coating was used on the surface of TC4 titanium alloy. The microstructure and mechanical properties of the coating were studied by scanning electron microscope (SEM) and energy dispersive analyzer (EDS) and Rockwell hardness tester. The results show that when the scanning speed is fixed at 400 mm / s and the laser power is 1.3N 1.51.7kW, the metallurgical bonding between the coating and the substrate is realized. The cladding effect is the best when the laser power is 1.5 kW, and the microstructure in the cladding layer is uniform and dense without defects such as pores and cracks. When the laser power is 1.3 kW, cracks appear in the cladding layer. When the laser power is fixed at 1.5 kW and the scanning speed is 300350400 mm/s, the bonding between the cladding layer and the substrate is good, and the microstructure in the cladding layer is uniform and compact without defects. With the increase of laser power and scanning speed, the surface hardness of the coating decreases, but it is about twice as high as that of the TC4 substrate, indicating that laser cladding the Co-based alloy powder coating on the TC4 surface can significantly improve the hardness of Co-based alloy powder coating.
【作者单位】：兰州理工大学甘肃省有色金属新材料省部共建国家重点实验室;兰州理工大学材料科学与工程学院;
【基金】：甘肃省有色金属新材料省部共建国家重点实验室开放基金(SKL12008) 国家自然基金(50961008,51061008) 国家重点基础研究发展计划(2011CB612203) 甘肃省科技计划(145RJZA090)
【分类号】：TG174.4

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