Laser Quenching equipment
Perform phase transformation hardening treatment on the metal surface to improve the hardness, wear ...
Perform phase transformation hardening treatment on the metal surface to improve the hardness, wear ...
Used for surface strengthening, repair, and remanufacturing of components, the coating has high adhe...
Flexible processing of complex curved sheet metal parts, with high cutting accuracy, fast speed, and...
Specially designed for seamless welding of precision plastic components, with a small heat affected ...
The last-stage blades of steam turbines operate for extended periods in a high-speed wet steam environment, where the leading edges often suffer severe droplet erosion, leading to profile deformation, efficiency decline, and even fracture risks. Traditional welding repairs involve high thermal input, which can easily cause blade deformation. Laser cladding technology, characterized by low thermal input and high bonding strength, emerges as the optimal solution to this problem.
This study employed a 2 kW fiber laser in conjunction with a powder feeder to perform precision cladding of cobalt-based alloy (e.g., Stellite 6) powder on the intake side of 1Cr13 martensitic stainless steel blades. The key process lies in parameter optimization: laser power of 1500-2000 W, scanning speed of 6-10 mm/s, overlap rate of 40%-50%, supplemented by preheating the substrate to 300°C. This effectively mitigated the crack tendency caused by the thermal expansion coefficient mismatch between the cobalt-based alloy and the steel substrate. The cladding layer thickness was controlled within 0.8-1.2 mm, exhibiting a fine dendritic structure with metallurgical bonding to the substrate, achieving bond strength far exceeding that of thermal spraying.
Practical tests have confirmed that the surface hardness of the clad blades reaches HRC 45-50, with water erosion resistance improved by more than threefold. After installation and operation, not only was the unit efficiency restored, but the overhaul cycle of the blades was also extended by over double, resulting in significant economic benefits. This provides crucial technical support for the safe and economical operation of power plants.
