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X-Ray Rocking Curve Measurements of Dislocation Density and Creep Strain Evolution in Gamma Prime-Strengthened Ni-Base Superalloys

Siva Kumar, K. ; Oruganti, Ramkumar ; Chatterjee, Partha

Metallurgical and Materials Transactions A, 2019, Vol.50(1), pp.191-198 [Tạp chí có phản biện]

ISSN: 1073-5623 ; E-ISSN: 1543-1940 ; DOI: 10.1007/s11661-018-4971-y

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  • Nhan đề:
    X-Ray Rocking Curve Measurements of Dislocation Density and Creep Strain Evolution in Gamma Prime-Strengthened Ni-Base Superalloys
  • Tác giả: Siva Kumar, K. ; Oruganti, Ramkumar ; Chatterjee, Partha
  • Chủ đề: Materials Science ; Metallic Materials ; Characterization and Evaluation of Materials ; Structural Materials ; Surfaces and Interfaces, Thin Films ; Nanotechnology ; Engineering
  • Là 1 phần của: Metallurgical and Materials Transactions A, 2019, Vol.50(1), pp.191-198
  • Mô tả: A linear relationship between mobile dislocation density and creep strain has generally been assumed in various models of creep in Ni-base superalloys. No stress or temperature dependence is assumed in such relationships. The current study aims to verify this relationship by use of an X-ray rocking curve-based method on DS GTD111™, a directionally solidified (DS) nickel-base turbine blade alloy. A new measurement scheme tailored for such large-grained, DS alloys using simultaneous tilt–twist methodology is outlined. Multiple test sets of DS GTD111™, creep tested under varying boundary conditions, were measured using this technique. The resulting rocking curve full-width-half-maxima (square root of the dislocation density) were found to correlate to creep strain by a simple linear transfer function with no systematic dependence on stress or temperature. As a validation case, application of this transfer function is demonstrated for long-term test data.
  • Ngôn ngữ: English
  • Số nhận dạng: ISSN: 1073-5623 ; E-ISSN: 1543-1940 ; DOI: 10.1007/s11661-018-4971-y

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