钛合金表面激光熔覆钴基合金层的组织及力学性能Microstructure and mechanical property of laser clad Co-based alloy coatings on titanium alloy
李春燕,寇生中,赵燕春,袁小鹏,袁子洲
摘要(Abstract):
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。
关键词(KeyWords): 钛合金;激光熔覆;钴基合金粉末;微观组织;硬度
基金项目(Foundation): 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)
作者(Author): 李春燕,寇生中,赵燕春,袁小鹏,袁子洲
DOI: 10.13289/j.issn.1009-6264.2015.02.031
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