引用本文:娄丽艳,张煜,徐庆龙,王轲岩,澹台凡亮,李长久,李成新.超高速激光熔覆低稀释率金属涂层微观组织及性能[J].中国表面工程,2020,33(2):149~159
LOU Liyan,ZHANG Yu,XU Qinglong,WANG Keyan,TANTAI Fanliang,LI Changjiu,LI Chengxin.Microstructure and Properties of Metallic Coatings with Low Dilution Ratio by High Speed Laser Cladding[J].China Surface Engineering,2020,33(2):149~159
【打印本页】   【HTML】   【下载PDF全文】   【查看/发表评论】  【EndNote】   【RefMan】   【BibTex】
←前一篇|后一篇→ 过刊浏览    高级检索
本文已被：浏览 2251次   下载 1062次 本文二维码信息
码上扫一扫！
分享到： 微信 更多
字体:加大+|默认|缩小-
超高速激光熔覆低稀释率金属涂层微观组织及性能
娄丽艳1,2, 张煜1, 徐庆龙1, 王轲岩1, 澹台凡亮3, 李长久1, 李成新1
1.西安交通大学 金属材料强度国家重点实验室, 西安 710049;2.天津职业技术师范大学 天津市高速切削与精密加工 重点实验室, 天津 300222;3.山东能源重装集团大族再制造有限公司, 泰安 271222
摘要:
新兴的超高速激光熔覆技术通过对熔覆头的精巧设计,可实现激光、粉末路径最佳耦合,使粉末在飞行空间熔化且基体表面仅形成微溶池,在保证冶金结合的同时,大幅提高熔覆效率及粉末利用率,可制备厚度<100 μm、稀释率< 5%的均匀薄涂层。 为进一步探索超高速激光熔覆涂层组织结构特点,扩展其应用范围,探讨了低功率下 4 种典型涂层的微观结构及性能。 结果表明:超高速激光熔覆可制备 120 ~ 500 μm,无气孔、裂纹的高质量涂层;涂层组织致密,结合区多为粗大柱状晶,表层区以细晶为主;基体熔化区可低至数微米,稀释率可低至 1%。 其中,镍基碳化钨涂层、铝合金耐磨涂层硬度明显高于基体;钛合金阻燃涂层在激光烧蚀后,烧蚀坑深度降低,热影响区减小;高熵合金阻扩散涂层预氧化后形成以 Al2O3 为主的微米厚氧化膜,在上述涂层作用下,基体性能均得到提升。
关键词:  激光熔覆  涂层  热喷涂  微观组织  稀释率
DOI：10.11933/j.issn.1007-9289.20191118001
分类号:TG174.44
文章编号:1007-9289(2020)02-0149-11
文献标识码:A
基金项目:国家重点研发计划 (2018YFB2002000)； 国家自然科学基金 (51761145108)； 天津市自然科学基金 (19JCQNJC03800)
Microstructure and Properties of Metallic Coatings with Low Dilution Ratio by High Speed Laser Cladding
LOU Liyan1,2, ZHANG Yu1, XU Qinglong1, WANG Keyan1, TANTAI Fanliang3, LI Changjiu1, LI Chengxin1
1.State Key Laboratory for Mechanical Behavior of Materials, Xi’ an Jiaotong University, Xi’ an 710049 , China;2.Tianjin Key Laboratory of High Speed Cutting & Precision Machining, Tianjin University of Technology and Education, Tianjin 300222 , China;3.Shandong Energy Heavy Equipment Group Dazu Remanufacturing Co. ,Ltd. , Taian 271222 , China
Abstract:
By specially designing the cladding head, the optimal coupling of laser beam and powder flow could be achieved in the newly developed high speed laser cladding (HSLC) process. Using such head, the particles melt in flight while the surface of substrate forms a micro-melt pool, so that a coating with metallurgical bonding can be obtained due to the high deposition speeds and powder utilization rate. As a result, producing high quality coatings with thickness <100 μm and dilution <5% is possible by using HSLC. In order to characterize the microstructure of the HSLC coatings and expand its applications, four differ- ent coatings with low dilution ratio are fabricated and the microstructure and properties of the coatings were studied under a rela- tively low laser power. Results show that high-quality pore-and crack-free coatings with thickness of 120~ 500 μm are produced by HSLC. All coatings have compact structure with coarse columnar crystals around the interface and fine grains near the coating surface. The melt area of the substrate reaches a micrometer range, and the dilution rate is less than 1%. For the nickel-based WC coating and the wear resistance coating on aluminum alloys, the hardness of the coatings is much bigger than the that of sub- strate. For the burn resistant coating on titanium, the depth of the laser-melt hole and range of HAZ is significantly reduced. For the diffusion resistant coating on high entropy alloy, the oxide film (Al2O3) forms by pre-oxidation. Overall, the coatings with low dilution ratio prepared by HSLC exhibit good protection for the substates studied.
Key words:  
手机扫一扫看