Turbine component having a low residual stress ferromagnetic damping coating

摘要

A turbine component having a low residual stress ferromagnetic damping coating. The ferromagnetic damping coating may include a ferromagnetic damping material applied in at least partially molten powder form, which may be directed at a surface of the substrate at an application velocity so that it causes partial plastic deformation of the surface while adhering to the surface of the substrate and solidifying in less than 3 seconds to create a ferromagnetic damping coating, resulting in a coated substrate. The ferromagnetic damping coating has a balanced coating residual stress, including a tensile quenching stress component and a compressive peening stress component. The balanced coating residual stress is within a range of ±50 MPa without having to subject the coated substrate to a high temperature annealing process. The resulting coated substrate exhibits a high damping capacity.

主权项

1. A turbine component, comprising:
a) a metal based substrate (20) having a substrate thickness (22), a surface (24), and a bulk hardness; and b) a ferromagnetic damping coating (10) layer affixed to at least a portion of the surface (24) of the metal based substrate (20), thereby providing a coated substrate (100) and defining a coating-substrate interface, and wherein:
i) the ferromagnetic damping coating (10) has a balanced coating residual stress and the balanced coating residual stress includes at least a tensile quenching stress component and a compressive peening stress component such that the balanced coating residual stress is within a range of about ±50 MPa;ii) the ferromagnetic damping coating (10) has a coating thickness (12) of about 2% to about 20% of the substrate thickness (22); andiii) a hardness of the metal based substrate (20) at the coating-substrate interface is within 25% of the bulk hardness.