激光定向能量沉积多尺度TiN强化Ti6Al4V复合材料微观组织及耐磨性研究  

Microstructure and Wear Resistance of Multiscale TiN-Strengthened Ti6Al4V Composites Materials via Laser-Directed Energy Deposition

作　　者：陈思宇 雷剑波[2] 杨光[3] 张莹[1] 赵万辉 王涛[1] Chen Siyu;Lei Jianbo;Yang Guang;Zhang Ying;Zhao Wanhui;Wang Tao(College of Aeronautical Engineering,Civil Aviation University of China,Tianjin 300300,China;Laser Technology Institute,Tiangong University,Tianjin 300387,China;College of Instrumentation Electrical Engineering,Jilin University,Changchun 130061,Jilin,China)

机构地区：[1]中国民航大学航空工程学院,天津300300 [2]天津工业大学激光技术研究所,天津300387 [3]吉林大学仪器科学与电气工程学院,吉林长春130061

出　　处：《激光与光电子学进展》2024年第23期280-288,共9页Laser & Optoelectronics Progress

基　　金：国家自然科学基金民航联合基金重点项目(U2233201),国家自然科学基金面上项目(52172360);中央高校基本科研业务费(3122023PT01);天津市研究生科技创新项目(2022SKYZ352)。

摘　　要：为提升航空发动机钛合金叶片叶尖耐磨性,采用激光定向能量沉积技术制备了微米TiN/Ti6Al4V、纳米TiN/Ti6Al4V和微米/纳米TiN/Ti6Al4V三种复合材料。微米TiN部分熔化,分布在Ti6Al4V基体中实现颗粒弥散强化,纳米TiN完全溶解,固溶在Ti6Al4V基体组织中,实现固溶强化。随着熔池温度和N元素含量变化,纳米TiN/Ti6Al4V和微米/纳米TiN/Ti6Al4V组织中生成初生和共晶TixN相,呈现树枝状、花瓣状和晶须状微观结构,促进晶粒细化。微米、微米/纳米和纳米TiN/Ti6Al4V复合材料的显微硬度分别为510 HV_(0.2)、565 HV_(0.2)和604 HV_(0.2),磨损量分别为7.8、6.9、5.3 mg。与Ti6Al4V相比,显微硬度分别提升了19.4%、32.1%和41.5%,磨损量分别降低了13.3%、23.3%和41.1%,纳米TiN/Ti6Al4V表现出最高的显微硬度和最佳的耐磨性。To improve the wear resistance of titanium alloy blades used in aircraft engines,three composite materials,namely micro-TiN/Ti6Al4V,nano-TiN/Ti6Al4V,and micro/nano-TiN/Ti6Al4V,were prepared via laser-directed energy deposition.Micro-TiN partially melted and dispersed within the Ti6Al4V matrix,leading to particle strengthening.Meanwhile,nano-TiN completely dissolved and solidified within the Ti6Al4V matrix,leading to solid solution strengthening.With variations in the melt-pool temperature and nitrogen content,primary and eutectic TixN phases formed in the nano-TiN/Ti6Al4V and micro/nano-TiN/Ti6Al4V structures,exhibiting dendritic,flower-like,and whisker-like microstructures that promoted grain refinement.The microhardness values(wear rates)of the micro-,micro/nano-,and nano-TiN/Ti6Al4V composite materials were 510 HV_(0.2)(7.8 mg),565 HV_(0.2)(6.9 mg),and 604 HV_(0.2)(5.3 mg),respectively.Compared with that of Ti6Al4V,the microhardness values of micro-,micro/nano-,and nano-TiN/Ti6Al4V increased by 19.4%,32.1%,and 41.5%,respectively,and the wear rates decreased by 13.3%,23.3%,and 41.1%,respectively.Notably,nano-TiN/Ti6Al4V exhibited the highest microhardness value and optimal wear resistance.

关 键 词：激光定向能量沉积 陶瓷强化 微观组织 摩擦磨损 

分 类 号：TG148[一般工业技术—材料科学与工程]