Technical Paper
Development of laser cladding stellite F alloy on valve face
2000-06-12
2000-05-0113
The laser cladding stellite F alloy on valve face by 2 KW CO2 laser equipment was investigated. The powder mixture paste was precoated on valve face in experiments of laser cladding process. The laser cladding process, the microstructure of laser cladding layer, the chemical composition distribution and the microhardness distribution in laser cladding layer were examined by metallurgical microscope and scanning electric microscope, and the 1000-hours engine endurance test was conducted in WD615.68 high-performance test engine. The results show that the cladding layer on valve face which possesses fine crystalline grain, close microstructure and low dilutability has been obtained by laser cladding stellite F alloy. The microhardness of the laser cladded layer is above l600 kg/mm2, HV0.2 100 higher than microhardness of bead welding layer at same depth.