Deformation and microstructure evolution in Co-Ni-Cr-Mo superalloy during hot working

Ika Kartika, H. Matsumoto, A. Chiba

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

Deformation and microstructure evolution in Co-33Ni-20Cr-10Mo superalloy during hot deformation are studied by carrying out compression tests between 950 °C and 1200 °C with an increment of 50 °C at strain rates of 0.1, 1, 10, and 30 s-1. The flow curves obtained for the aforementioned strain rates in this temperature range show that this alloy has high work-hardening characteristics; this is due to the strong dislocation-solute interactions associated with dynamic strain aging (DSA). Microstructures deformed at temperatures up to 1050 °C consist of numerous deformation twins and highly dense dislocations, which are attributed to the high activation energy for deformation and the relatively low strain-rate sensitivity m in the temperature range of 950 °C to 1200 °C. Dynamic recrystallization (DRX), which is dependent on the strain rate, occurs at T = 1000 °C, 1050 °C, 1100 °C, 1150 °C, and 1200 °C.

Original languageEnglish
Pages (from-to)1457-1468
Number of pages12
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume40
Issue number6
DOIs
Publication statusPublished - 2009

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys

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