The effects of carbon content on the microstructure and elevated temperature tensile strength of a nickel-base superalloy

Chao Nan Wei*, Hui Yun Bor, Li Chang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

33 Scopus citations

Abstract

This study investigates how carbon content affects the microstructure and elevated temperature tensile strength of fine-grain CM-681LC superalloy. Experimental results indicate that increasing the carbon content from 0.11 to 0.15wt% increases the total area fraction of carbides considerably. However, the two alloys exhibit similar carbide shapes and sizes, probably because the short solidification time in the fine-grain process limits the growth of carbides. Besides, carbon addition significantly reduces the area fraction of γ-γ' eutectic phases from 8.6 to 5.3% because the eutectic phase forming elements are consumed by (Ta, Hf)C carbides and the carbides occupy the position of γ-γ' eutectic phases during the solidification. Further, the carbon addition improves the mechanical strength by about 6% and the elongation by about 50% in tensile tests at 760°C and yields favorable tensile performance at elevated temperature.

Original languageEnglish
Pages (from-to)3741-3747
Number of pages7
JournalMaterials Science and Engineering A
Volume527
Issue number16-17
DOIs
StatePublished - 1 Jun 2010

Keywords

  • Carbon
  • Grain refinement
  • Hot isostatic pressing
  • Microstructure
  • Nickel-base superalloy
  • Tensile test

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