Effect of intergranular carbides on creep strength in nickel-based heat-resistant alloys

Takanori Ito, Shigeto Yamasaki, Masatoshi Mitsuhara, Minoru Nishida, Mitsuharu Yonemura

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Creep behaviors and microstructures for two Ni-based heat-resistant alloys with different carbon contents were investigated. The chemical compositions of the alloys were Ni-20Cr-15Co-6Mo-1Ti-2Al-2Nb-0.004 and 0.021C (mass%). The 0.004C and 0.021C alloys are referred to as the low-and high-C alloys, respectively. After solid-solution treatment at 1373 K for 1 h and isothermal annealing at 1023 K for 32 h, fine Ni3Al (γ) particles were formed in the grain interior of both alloys. The average diameter and number density of γ particles were similar in both alloys. M23C6 carbides were formed on grain boundaries after the isothermal annealing. Coverage ratios with the carbides in the high-C alloy were higher than that in the low-C alloys. Creep tests were performed at 1123 K and 130 MPa. The rupture time for the high-C alloy was longer than that for the low-C alloy, though both minimum creep rates were similar. In the high-C alloy, the creep strain was stored uniformly in the grain interior and the formation of a precipitate-free zone during the creep deformation was suppressed. Therefore, intergranular carbides with a high coverage ratio decreased the creep rate in the acceleration region.

Original languageEnglish
Pages (from-to)52-58
Number of pages7
JournalMaterials Transactions
Volume58
Issue number1
DOIs
Publication statusPublished - Jan 1 2017

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creep strength
heat resistant alloys
Nickel
Superalloys
carbides
Carbides
Creep
nickel
Isothermal annealing
creep tests
annealing
Precipitates
precipitates
Solid solutions
chemical composition
Grain boundaries
solid solutions
Carbon
grain boundaries

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Effect of intergranular carbides on creep strength in nickel-based heat-resistant alloys. / Ito, Takanori; Yamasaki, Shigeto; Mitsuhara, Masatoshi; Nishida, Minoru; Yonemura, Mitsuharu.

In: Materials Transactions, Vol. 58, No. 1, 01.01.2017, p. 52-58.

Research output: Contribution to journalArticle

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