Effect of high temperature exposure on the microstructure of Udimet-500 super alloy

In this paper, microscopic analysis and fatigue experiment were conducted to detect the damage degree of turbine blades after a 600 h service and determine the reliable service time. First, several service blades were cut into slices on different cross sections and microscopically examined. It is found that the γ′ phase particles are slightly coarsened and the γ′ phase parameters change with temperature and stress distribution. Then, fatigue test was conducted on service blades simulating the real working condition. The test result shows that the blades after a 600 h service would serve for 3596 h more until failure during actual flight. The ultimate fracture is mainly caused by the interaction of fatigue, creep and oxidation. Besides, the γ′ phase parameters change obviously compared with service blade without fatigue test. It indicates that the γ′ phase parameters could be used to evaluate the microdamage of service blades, which has great significance for service reliability of the turbine machinery.

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“…So, the damage during a testing load cycle is consistent with the damage of 1.578 service hours during actual flight, as shown in Eq. (11).…”

Section: Fatigue Testing Load Spectrummentioning

confidence: 99%

Failure assessment of the first stage high‐pressure turbine blades in an aero‐engine turbine

Shi

Wang

Yang

et al. 2017

Fatigue Fract Eng Mat Struct

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“…Besides, plastic deformation caused by load, there is no grain boundary, and the evolution law of the microstructure of the precipitation phase and the matrix phase during creep and after the heat treatment process is different from that of general superalloys. At high temperature, the microstructure morphology of DD6 will change to a certain extent, which will affect the performance of the blades [15][16][17][18]. The study of the dissolution and precipitation behavior of the γ' phase at high temperature has important practical engineering significance.…”

Section: Introductionmentioning

confidence: 99%

Influences of the Heating and Cooling Rates on the Dissolution and Precipitation Behavior of a Nickel-Based Single-Crystal Superalloy

Wang

Cheng

et al. 2019

Metals

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The effects of the heating rate before solution treatment, and the cooling rate after solution treatment on the morphological distribution and evolution of the precipitation phase of nickel-based single crystal superalloy were studied. The dissolution, precipitation, and growth of the precipitation phase and the matrix phase during heat treatment were analyzed by the means of high-power scanning electron microscopy. The results show that the morphology of the precipitated phase has nothing to do with the distribution of the precipitated phase and the heating rate in the heating process, but the cooling rate in the cooling process affects the shape, size, and distribution of the precipitated phase. The faster the cooling rate, the smaller the precipitated phase is, the more irregular the shape is, the smaller the equivalent edge length is, and the smaller the channel width of the matrix phase is.

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“…Besides plastic deformation caused by load, there is no grain boundary, and the evolution law of microstructure of precipitation phase and matrix phase during creep and after heat treatment process is different from that of general superalloys. At high temperature, the microstructure morphology of DD6 will change to a certain extent, which will affect the performance of blades [15][16][17][18]. The study of dissolution and precipitation behavior of γ´ phase at high temperature has important engineering practical significance.…”

Section: Introductionmentioning

confidence: 99%

Influence of Heating and Cooling Rate on Dissolution and Precipitation Behavior of Nickel-based Single Crystal Superalloy

Wang¹,

Cheng²

2019

Preprint

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The effects of heating rate before solution treatment and cooling rate after solution treatment on the morphological distribution and evolution of precipitation phase of nickel-based single crystal superalloy were studied. The dissolution, precipitation and growth of precipitation phase and matrix phase during heat treatment were analyzed by means of high power scanning electron microscopy. The results show that the morphology of precipitated phase has nothing to do with the distribution of precipitated phase and the heating rate in the heating process, but the cooling rate in the cooling process affects the shape, size and distribution of precipitated phase. The faster the cooling rate, the smaller the precipitated phase is, the more irregular the shape is, the smaller the equivalent edge length is, and the smaller the channel width of matrix phase is.

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Effect of high temperature exposure on the microstructure of Udimet-500 super alloy

Cited by 15 publications

References 9 publications

Failure assessment of the first stage high‐pressure turbine blades in an aero‐engine turbine

Failure assessment of the first stage high‐pressure turbine blades in an aero‐engine turbine

Influences of the Heating and Cooling Rates on the Dissolution and Precipitation Behavior of a Nickel-Based Single-Crystal Superalloy

Influence of Heating and Cooling Rate on Dissolution and Precipitation Behavior of Nickel-based Single Crystal Superalloy

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