Open AccessMicrostructure and Properties of Laser Cladding Coating on the Surface of Superalloy Ti600
Author(s) -
Zhaowen Jin,
Hong Bo Wang,
Tao Yuan
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/714/3/032054
Subject(s) - materials science , microstructure , coating , lamellar structure , composite material , indentation hardness , superalloy , laser , whisker , cladding (metalworking) , metallurgy , optics , physics
The laser cladding technology was used to prepare the Ti / TiB 2 composite coating on the surface of Ti600, and the microstructure and performance test results of the coating obtained under different laser specific energy conditions were analyzed. Studies have shown that the laser cladding coating and the substrate have achieved a good bond, and TiB 2 has formed into cellular TiB 2 after melting, and further solid solution becomes a whisker structure. The diffused TiC and TiN nuclei in the middle of the coating were fully grown and developed a dense dendrite structure with TiB 2 particles. A dual-phase structure of granular TiB 2 and many lamellar structures was formed under the coating. When the laser specific energy is 20 kJ / cm 2 , the coating reaches the highest microhardness of 990HV, nearly 2.5 times the hardness of the substrate. The amount of wear shows a monotonic decrease with the increase of the specific energy of the laser, and the average friction coefficient shows a monotonous decrease as the specific energy of the laser increases.