Effect of oxygen content and heat treatment on carbide precipitation behavior in PM Ni-base superalloys

Heng San Liu, Lin Zhang, Xin Bo He, Xuan Hui Qu, Hong Min Zhu, Guo Qing Zhang

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

The influence of oxygen content and heat treatment on the evolution of carbides in a powder metallurgy (PM) Ni-base superalloy was characterized. The results reveal that oxygen content has little influence on the precipitation of carbides inside the particles. However, under the consolidated state, stable Ti oxides on the particle surface act as nuclei for the precipitation of prior particle boundaries (PPB). Also, oxygen can diffuse internally along grain boundaries under compressive stress, which favors the precipitation of carbides inside the particles. Therefore, a higher amount of carbides will appear with more oxygen content in the case of consolidated alloys. It is also observed that PPB can be disrupted into discontinuous particles at 1200°C, but this carbide network is hard to be eliminated completely. The combined MC-M23C6 morphology approves the nucleation and growth mechanism of carbide evolution.

Original languageEnglish
Pages (from-to)827-835
Number of pages9
JournalInternational Journal of Minerals, Metallurgy and Materials
Volume19
Issue number9
DOIs
Publication statusPublished - 2012 Sep 1
Externally publishedYes

Keywords

  • Carbides
  • Heat treatment
  • Nickel alloys
  • Oxygen
  • Powder metallurgy
  • Precipitation
  • Superalloys

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Geochemistry and Petrology
  • Metals and Alloys
  • Materials Chemistry

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