Laser Direct Deposition of T800 Cobalt-Based Alloy on Microstructure Wear Block and Hardness
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.
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