Effects of Minor Alloying on the Microstructures and Creep Properties of Rr2086 Superalloys
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Effects of Minor Alloying on the Microstructures and Creep Properties of Rr2086 Superalloys

Effects of Minor Alloying on the Microstructures and Creep Properties of Rr2086 Superalloys


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This dissertation, "Effects of Minor Alloying on the Microstructures and Creep Properties of RR2086 Superalloys" by 孔永華, Yonghua, Kong, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled Effects of Minor Alloying on the Microstructures and Creep Properties of RR2086 Superalloys Submitted by Kong Yonghua for the degree of Doctor of Philosophy at the University of Hong Kong in July 2005 To improve the resistance to low or high angle grain boundary defects in single crystal aero-engine components, a Rolls-Royce experimental superalloy RR2086 has been modified by adding minor additions of grain boundary strengthening elements C, B and Hf. Following an experimental investigation of RR2086 single and bicrystals, the effects of the minor alloying on the microstructures and creep properties of grain matrix and boundary have been revealed. I. RR2086 single crystals The modified RR2086 single crystals (SXs) contains blocky and platelike Metallic Carbides (MCs) in the interdendritic eutectic regions. The blocky morphology of MC is associated with its high hafnium content. The formation of MCs within interdendritic eutectic regions caused several microstructural differences between the modified RR2086 and its base alloy. Firstly, the modified RR2086 exhibits irregular γ-γ′ eutectic structures in the interdendritic regions, while the initial microstructure of the base alloy shows regular arrays of γ′ particles homogeneously distributed in γ matrix. Secondly, the formation of MCs in the modified RR2086 SXs increased the microsegregation of refractory elements Re and W in dendrite cores, which in turn favored the Topologically-Close- Packed (TCP) phase transformation after high temperature exposure. The stronger segregation in modified RR2086 is due to the retardation of diffusion by the physical ipresence of MCs during solidification and solution treatment. Thirdly, according to quantitative measurements, microporosity was reduced in modified RR2086, which is attributed to shrinkage compensation of the micropores by MC volume expansion. Examination of failed creep specimens indicated that microporosity, not carbides or TCP phases, is the principle crack initiation site in both modified and base alloys. Fourthly, during creep deformation, in the base RR2086 SX, rafting developed extensively throughout the specimen, but was less perfect in the interdendritic space of the modified alloy, which contained coarse irregular MC and γ′ precipitates prior to creep. At 850C and loading at 430MPa ie 850C/430MPa, the modified RR2086 exhibits a slightly longer rupture life than the base alloy. At 950C/210MPa and 1050C/165MPa, the modified RR2086 has significantly higher strain rates throughout its life compared with the base alloy, and hence shorter rupture lives were found. The microstructures that significantly affected the creep performance of the modified RR2086 are porosity reduction and weak interdendritic regions. The improvement of creep performance at 850C is credited to the reduction of pores in the modified RR2086. At 950C/210MPa and 1050C/165MPa, the detrimental influences of interdendritic regions that contained both large, irregular and limited rafted γ′ and brittle MCs, was more dominant than the beneficial effect of porosity reduction. TCP phases had a minor effect on creep properties due to their relatively low population density in both modified and base RR2086. II. RR2086 bicrystals Before thermal exposure, precipitat


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Product Details
  • ISBN-13: 9781361209912
  • Publisher: Open Dissertation Press
  • Publisher Imprint: Open Dissertation Press
  • Height: 279 mm
  • No of Pages: 248
  • Weight: 585 gr
  • ISBN-10: 1361209917
  • Publisher Date: 26 Jan 2017
  • Binding: Paperback
  • Language: English
  • Spine Width: 13 mm
  • Width: 216 mm


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