A coating material and laser cladding process for water erosion resistance of steam turbine blades

By using a specific iron-based alloy powder coating material and laser cladding process on the surface of turbine blades, a dense, non-porous coating is formed, which solves the problem of insufficient water erosion resistance of existing coating materials, improves the water erosion resistance and comprehensive mechanical properties of the blades, and reduces production costs.

CN117512470BActive Publication Date: 2026-07-10HAINAN NUCLEAR POWER CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HAINAN NUCLEAR POWER CO LTD
Filing Date
2023-10-27
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

Existing anti-water erosion coating materials for steam turbine blades have insufficient anti-water erosion performance and cannot effectively prevent water erosion damage to the blades. Especially under high-parameter operating conditions, this leads to fatigue cracks and detachment of the blade materials, affecting the safety and reliability of the unit.

Method used

A metallurgically bonded coating is formed on the blade surface using a specific iron-based alloy powder coating material through laser cladding. The coating material contains elements such as C, Cr, Mn, Nb, Mo, Si, W, V, and Al. With appropriate laser cladding parameters, such as a power density of 100–150 W/mm² and a powder feed rate of 40–60 r/min, a dense, non-porous coating is formed.

Benefits of technology

It improves the water erosion resistance of the blade coating, enhances the toughness and hardness of the blade, reduces production costs, makes the coating less prone to cracking and peeling, and improves the overall mechanical properties of the blade.

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Abstract

The application provides a coating material and a laser cladding process for steam turbine blade water erosion resistance, and the mass percentage of each component of the coating material is as follows: C: 0.65-0.80wt%, Cr: 3.00-6.50wt%, Mn: 0.22-0.55wt%, Nb: 0.30-0.80wt%, Mo: 4.00-8.50wt%, Si: 0.1-0.3wt%, W: 5.00-8.00wt%, V: 1.50-2.50wt%, Al: 0.40-0.60wt%, and the balance is Fe and a small amount of impurity elements. The laser power density in the cladding process is 100-150W / mm 2 , argon is used to protect the molten pool, the powder feeding amount is 40-60r / min, and the multi-pass lap rate is 30-50%. The coating material provided by the application has the characteristics of high toughness, not easy to produce pores and excellent water erosion resistance. The cladding layer prepared from the coating material has high water erosion resistance and good comprehensive mechanical properties.
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