激光扫描速度对FeCrNiAl_(0.3)Ti_(0.3)熔覆层组织与性能的影响  

Effects of scanning speed on microstructure and properties of laser cladding FeCrNiAl_(0.3)Ti_(0.3) coating

作　　者：陈方川 冉佳朋 刘元铭 王涛 赵雪霞[1,2,3] CHEN Fangchuan;RAN Jiapeng;LIU Yuanming;WANG Tao;ZHAO Xuexia(College of Mechanical and Vehicle Engineering,Taiyuan University of Technology,Taiyuan 030024,Shanxi,China;Engineering Research Center of Advanced Metal Composites Forming Technology and Equipment,Ministry of Education,Taiyuan University of Technology,Taiyuan 030024,Shanxi,China;National Key Laboratory of Metal Forming Technology and Heavy Equipment,Taiyuan University of Technology,Taiyuan 030024,Shanxi,China)

机构地区：[1]太原理工大学机械与运载工程学院,山西太原030024 [2]太原理工大学先进金属复合材料成形技术与装备教育部工程研究中心,山西太原030024 [3]太原理工大学金属成形技术与重型装备全国重点实验室,山西太原030024

出　　处：《钢铁研究学报》2024年第7期908-917,共10页Journal of Iron and Steel Research

基　　金：国家重点研发计划资助项目(2023YFB3307602);国家自然科学基金资助项目(52375367,51904206);海安太原理工大学先进制造与智能装备产业研究院开放研发项目(2023HA-TYUTKFYF028)。

摘　　要：为了提高TC4钛合金表面的硬度及耐磨性,通过激光熔覆工艺,在TC4钛合金表面熔覆了FeCrNiAl_(0.3)Ti_(0.3)高熵合金。研究了变化的激光扫描速度下,该熔覆层高熵合金(HEA)的宏观特征、显微组织、显微硬度以及耐磨性能。结果显示:当激光功率设定为1600 W,扫描速度调整为13 mm/s时,制备出的HEA熔覆层与TC4基体实现了良好的冶金结合,同时未观察到显著的缺陷。熔覆层显微组织致密均匀,由富Fe和Cr的BCC相以及富Ni、Ti、Al的FCC相共同构成枝晶(DR)以及枝晶间(IR)组织。在最佳工艺参数下,熔覆层平均硬度值为618HV0.2,约为基体硬度(290HV0.2)的2.1倍,其耐磨性是基体的3.4倍,磨损机制为磨粒磨损、粘着磨损和摩擦氧化磨损的复杂相互作用,具有良好的耐磨性。In order to improve the hardness and wear resistance of TC4 titanium alloy,FeCrNiAl_(0.3)Ti_(0.3) high entropy alloy was cladded on the surface of TC4 titanium alloy by laser cladding process.The macroscopic characteristics,microstructure,microhardness and wear resistance of the cladding layer of high entropy alloy(HEA)at different laser scanning speeds were studied.The results show that when the laser power is set to 1600 W and the scanning speed is adjusted to 13 mm/s,the prepared HEA cladding layer and the TC4 substrate achieve a good metallurgical bonding,and no significant defects are observed.The microstructure of the cladding layer is dense and homogeneous,and the dendritic(DR)and interdendritic(IR)microstructures are composed of BCC phase rich in Fe and Cr and FCC phase rich in Ni,Ti and Al.Under the optimal process parameters,the average hardness value of the fused cladding layer is 618HV0.2,which is about 2.1 times of the hardness of the substrate(290HV0.2),and its abrasion resistance is 3.4 times of that of the substrate,and the wear mechanism is a complex interaction of abrasive wear,adhesive wear and friction oxidative wear,with good wear resistance.

关 键 词：TC4钛合金 激光熔覆 高熵合金熔覆层 显微组织 耐磨性能 

分 类 号：TG174.4[金属学及工艺—金属表面处理] TG665[金属学及工艺—金属学]