激光扫描速度对FeCrNiAl0.3Ti0.3熔覆层组织与性能的影响
Effects of scanning speed on microstructure and properties of laser cladding FeCrNiAl0.3Ti0.3 coating
陈方川 1冉佳朋 1刘元铭 2王涛 2赵雪霞2
作者信息
- 1. 太原理工大学机械与运载工程学院,山西太原 030024
- 2. 太原理工大学机械与运载工程学院,山西太原 030024;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;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
- 折叠
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 FeCr-NiAl0.3Ti0.3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1 600W,扫描速度调整为13mm/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.
Abstract
In order to improve the hardness and wear resistance of TC4 titanium alloy,FeCrNiAl0.3Ti0.3 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Key words
TC4 titanium alloy/laser cladding/high-entropy alloy coating/microstructure/wear resistance引用本文复制引用
基金项目
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)
国家自然科学基金资助项目(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)
出版年
2024
NETL
NSTL
万方数据