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Title: Effect of cold drawing ratio on γ′ precipitation in Inconel X-750

Inconel X-750 is a Ni-based precipitation-hardened superalloy having large tensile and fracture strengths. In the study, X-750 wires were cold drawn to different extents. Small angle neutron scattering was employed to quantitatively measure the size and volume fraction of the γ′ phase as a function of the cold drawing ratio (DR) and aging temperature. The presence and size of γ′ precipitates were confirmed by transmission electron microscopy. The drawing ratio had an important effect on the volume fraction of the γ′ precipitates. However, the size of the precipitates was independent on the drawing ratio. The specimen with the minimum drawing ratio (DR0) produced the largest volume fraction of γ′ as compared with large drawing ratio (DR) specimens such as DR17 and DR42. The small volume fraction of the γ′ phase for a sizeable drawing ratio was associated with the large amount of nucleation sites for secondary carbides, M{sub 23}C{sub 6}, and the fast diffusion path, i.e., dislocation, needed to form M{sub 23}C{sub 6}. A Cr depletion zone around the secondary carbides raised the solubility of γ′. Therefore, the significant drawing ratio contributing to the large volume fraction of the secondary carbides decreased the volume fraction of the γ′ precipitates inmore » Inconel X-750. - Highlights: • The volume fraction of secondary carbides increased with the drawing ratio. • The volume fraction of γ′ decreased as the drawing ratio increased. • The drawing ratio affected the γ′ volume fraction with no variation of the γ' size. • The volume fraction of γ′ was affected by the secondary carbide volume fraction.« less
Authors:
 [1] ;  [2] ;  [3] ; ;  [4] ;  [1] ;  [1]
  1. Department of Materials Science and Engineering, Pusan National University, Busan 609-735 (Korea, Republic of)
  2. (Korea, Republic of)
  3. Neutron Science Division, HANARO Center, Korea Atomic Energy Research Institute, Daejon 305-353 (Korea, Republic of)
  4. Advanced Metallic Materials Division, Korea Institute of Materials Science, Changwon 642-831 (Korea, Republic of)
Publication Date:
OSTI Identifier:
22403558
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Characterization; Journal Volume: 96; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; AGING; CARBIDES; COMPARATIVE EVALUATIONS; DIFFUSION; DISLOCATIONS; DRAWING; FRACTURE PROPERTIES; INCONEL X750; NEUTRON DIFFRACTION; NUCLEATION; PRECIPITATION; SMALL ANGLE SCATTERING; SOLUBILITY; TRANSMISSION ELECTRON MICROSCOPY