An experimental evaluation method for the service temperature of superalloy turbine blades

Abstract

The invention provides an experiment assessment method of the service temperature of a high temperature alloy turbine blade, and relates to experiment assessment of the service temperature of a DZ125 directional solidification high temperature alloy turbine blade. A corresponding relationship among the temperature, the time and the volume fraction of a primary gamma' phase in dendrite arm is determined through blade material laboratory heat exposure experiments according to a thermodynamic phase equilibrium principle. The substrate temperature of the service blade is assessed by using the relationship and the volume fraction of the primary gamma' phase of the blade after practical service for a period of time. The method eliminates complex influences of blade coating and gas film cooling on the service temperature of the blade, is reliable in assessment of the service temperature of the blade substrate, is suitable for being applied in engineering, and has strong engineering application values and wide prospect in the service temperature assessment of the DZ125 blade.

Description

Technical field [0001] The invention belongs to the technical field of nickel-based directionally solidified superalloy blades, and in particular relates to an experimental evaluation method for the service temperature of a directionally solidified turbine blade. Background technique [0002] Aeroengines are highly complex and precise thermal machinery. As one of the most critical components of aeroengines, turbine blades are important hot-end components that convert the enthalpy and kinetic energy of gas into mechanical energy. With the continuous improvement of the thrust-to-weight ratio of aero-engines, the temperature of the external gas of the blades continues to increase, often far exceeding the melting point of the blade material. Therefore, it is necessary to use coatings, surface film cooling, internal cooling holes, etc. to reduce the blade base temperature, but also The substrate temperature measurement and calculation increase the difficulty. At the same time, due to...

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Problems solved by technology

Due to the different working conditions of different parts of the blade, there are differences in the degradation degree of the microstructure after service. By quantifying and characterizing the degradation degree of the microstructure of the blade after service, the service environment of the blade can be indirectly deduced, so that the degraded microstructure can be used to evaluate the service temperature field of the blade. It is possible, but there is no relevant report on quantifying the degraded tissue and using it to quantitatively evaluate the actual service temperature of the blade

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