Influence of Stackers of Particles on Piezoelectricity of 0-3 Type Piezo-Composite

Luo, Dusha; Liu, H.X.; Ouyang, Shi

doi:10.4028/0-87849-997-0.43

Cited by 2 publications

(2 citation statements)

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“…It is indicated that γ′ rafting can improve the stress rupture properties of single crystal superalloy [18]. Formation of regular and perfect γ′ rafts has good effect on the stress rupture life of single crystal superalloy [19]. The perfect and regular raft structure in the specimen with solution AC method can be an effective barrier confining dislocation activity within the discrete γ Microporosity, residual eutectic and phase interface will become the site of crack initiation and easy ways for the crack propagation in the stress rupture test at higher temperature and lower stress [20].…”

Section: Resultsmentioning

confidence: 99%

Influence of Cooling Method on the Microstructure and Stress Rupture Property of a Single Crystal Superalloy

Shi

Liu

Wang

et al. 2015

MSF

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The single crystal superalloy with [001] orientation were prepared by screw selecting method in the directionally solidified furnace. Three different cooling method, water cooling (WC), air cooling (AC) and furnace cooling (FC) were used after same solution treatment. Then these specimens received same two-step aging treatment. Influence of solution cooling method on the microstructure and stress rupture properties of the alloy under the test condition of 980 °C and 300 MPa was investigated. The microstructures of the samples were examined by scanning electron microscope (SEM). The results showed that the solution cooling method of heat treatment played an important role in the microstructure and stress rupture properties of the alloy. The size of γ′ phase and the width of the γ matrix channel of the alloy increased with decreasing cooling rate. The stress rupture properties of the alloy increased at first and decreased afterwards with decreasing cooling rate. The alloy with air cooling (AC) has the best stress rupture properties. The γ′ phase changed into a perfect raft structure during the stress rupture process of the specimens with AC method. However, the γ′ phase changed into a very irregular raft microstructure in the specimens with the water cooling (WC) and furnace cooling (FC) method. The micro-cracks in the specimen with irregular raft make the initiation and interconnection easier than that in the specimen with regular raft. Therefore, the alloy with AC method has optimum microstructure and stress rupture property.

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Section: Resultsmentioning

confidence: 99%

Influence of Cooling Method on the Microstructure and Stress Rupture Property of a Single Crystal Superalloy

Shi

Liu

Wang

et al. 2015

MSF

View full text Add to dashboard Cite

show abstract

“…It is indicated that γ′ rafting can improve the stress rupture properties of single crystal superalloy [15]. Formation of regular and perfect γ′ rafts has good effect on the stress rupture life of single crystal superalloy [16]. The perfect and regular raft structure in the specimens without overheating or after overheating at 1100℃ can be an effective barrier confining dislocation activity leading to steady state creep.…”

Section: Discussionmentioning

confidence: 99%

Microstructure Evolution and Stress Rupture Properties of DD6 Single Crystal Superalloy after Overheating

Liu

Shi

Han

et al. 2017

MSF

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The second generation single crystal superalloy DD6 after standard heat treatment was respectively overheated at 1100°C, 1150°C, 1200°C, 1250°C, 1300°C, 1320°C for 1h and air cooled. The effect of overheating on the microstructure and stress rupture properties at 980°C/250MPa of the alloy was investigated. The results showed that the size of γ′ phase was slightly increased overheating at 1100°C, 1150°C and 1200°C. The size of γ′ phase had a big increase and its size distribution was very uneven after overheating at 1250°C. The small part of γ′ phase has serrated γ′/γ phase surface as a result of un-completely solution and the irregular small γ′ phase was in the majority when overheated at 1300°C. While all the irregular small γ′ phase precipitated again after completely solution when overheated at 1320°C. There was no fine second γ′ phase in the γ matrix channel of the alloy after standard heat treatment and overheating at 1320°C. But the fine second γ′ phase precipitated in the γ matrix channel after overheating at every temperature of 1100 °C~1300°C. No obvious change of the stress rupture life was found after overheating at 1100°C, 1150°C, 1200°C and 1250°C. The stress rupture life considerably reduced after overheating at 1300°C, whereas slightly reduced after overheating at 1320°C. The appearance of the raft had almost no change after overheating at 1100°C. With increasing of overheating temperature from 1100°C to 1250°C, the length of raft became shorter and the width thickening. The γ phase formed the wavy raft after overheating at 1300°C and 1320°C and the thickness of latter was larger than that of the former. Finally, the relationship between the microstructural evolution and stress rupture properties of the alloy after overheating was discussed.

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Influence of Stackers of Particles on Piezoelectricity of 0-3 Type Piezo-Composite

Cited by 2 publications

References 0 publications

Influence of Cooling Method on the Microstructure and Stress Rupture Property of a Single Crystal Superalloy

Influence of Cooling Method on the Microstructure and Stress Rupture Property of a Single Crystal Superalloy

Microstructure Evolution and Stress Rupture Properties of DD6 Single Crystal Superalloy after Overheating

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