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Slip delocalization and diffusion mediated carbide formation during fatigue of a nickel-base superalloy

Journal Article · · International Journal of Fatigue
 [1];  [2];  [3];  [2];  [2];  [4]
  1. Johns Hopkins Univ., Baltimore, MD (United States). Whiting School of Engineering. Dept. of Mechanical Engineering; Univ. of California, Santa Barbara, CA (United States)
  2. Univ. of California, Santa Barbara, CA (United States). Dept. of Materials
  3. Naval Research Lab. (NRL), Washington, DC (United States)
  4. Johns Hopkins Univ., Baltimore, MD (United States). Whiting School of Engineering. Dept. of Mechanical Engineering
Fatigue crack initiation at high temperatures occurs at microscopic fatigue shear bands that form near twin boundaries in polycrystalline nickel-base superalloys that contain minimal metallurgical defects. The associated dislocation sub-structure is complex and dependent on thermal and mechanical conditions. Here we show the formation of fine-scale carbide precipitates along these fatigue shear bands in a nickel-base superalloy during fatigue above 650 °C. The formation of carbide precipitates is studied using calculations of bulk and pipe diffusion. The contribution of pipe diffusion is observed to be critical in the formation of fine-scale carbides and occurs coincident with the delocalization of slip during fatigue.
Research Organization:
Univ. of California, Santa Barbara, CA (United States)
Sponsoring Organization:
US Air Force Office of Scientific Research (AFOSR); US Department of the Navy, Office of Naval Research (ONR); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0018901
OSTI ID:
1852695
Journal Information:
International Journal of Fatigue, Journal Name: International Journal of Fatigue Journal Issue: C Vol. 145; ISSN 0142-1123
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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