激光直接沉积T800钴基合金耐磨块显微组织及硬度研究
Laser Direct Deposition of T800 Cobalt-Based Alloy on Microstructure Wear Block and Hardness
焦宗戈 1付鑫 1付俊 1常建卫 1廖忠祥 1滕跃飞1
作者信息
- 1. 中国航发商用航空发动机有限责任公司,上海 200241
- 折叠
摘要
T800钴基合金具有优异的高温耐磨性能,广泛应用于航空发动机热端部件表面耐磨强化.基于激光直接沉积技术的优点,在K417G基体上成功制备出无缺陷T800钴基合金耐磨块.为考察激光直接沉积T800钴基合金耐磨块的组织性能,对耐磨块进行显微组织和硬度分析,并与某零件传统堆焊耐磨块进行了对比.实验结果表明:激光直接沉积耐磨块自耐磨块顶部到基材,显微硬度逐渐降低并光滑过渡到基材区,呈非线性连续下降趋势,并且出现了无堆焊热影响区硬度高于耐磨块硬度的现象;激光直接沉积耐磨块显微硬度高达704 HV,远高于堆焊耐磨块的410 HV;激光直接沉积耐磨块对基材的热影响较小,热影响区深度约为180 μm,远小于堆焊热影响区.
Abstract
The T800 cobalt-based alloy has excellent high-temperature wear resistance and is widely used for surface strengthening of aero-engine hot-end components.In this paper,benefiting from the advantages of laser direct deposition technology,defect-free T800 cobalt-based alloy wear blocks are successfully prepared on K417G substrate.To investigate the microstructure and properties of the laser direct-deposited T800 cobalt-based alloy wear blocks,microstructure and microhardness analyses are performed on the wear blocks,comparing the results with those of the conventional overlay wear blocks of a part.The experimental results show that the microhardness of laser direct-deposited wear block from the top of the wear to the base material displays a continuous non-linear decreasing trend,and the hardness of heat-affected zone without surfacing welding is higher than that of wear-resistant block.The microhardness of laser direct-deposited wear block is as high as 704 HV,which is much higher than the 340 HV of the surfacing wear block.The thermal influence of laser direct-deposited wear block on the base material is small,and the depth of heat-affected zone is about 180 μm,which is much smaller than the heat-affected zone of the surfacing.
关键词
激光/直接沉积/T800/钴基合金/耐磨Key words
laser/direct deposition/T800/cobalt-based alloy/wear-resistant引用本文复制引用
出版年
2024
NETL
NSTL
万方数据