Effects of co-addition of titanium and boron on microstructure of superplastic Cr-Mo steels

Masatoshi Aramaki, R. Onodera, H. Era, K. Kishitake

Research output: Contribution to journalArticle

Abstract

The effects of titanium and boron on the microstructure of a low alloyed Cr-Mo steel with 0.6 wt-%C have been investigated by comparison with a steel containing only titanium and a steel free from both titanium and boron. Each of the steels was subjected to thermomechanical treatment and annealed at 700°C, resulting in small grains of size a few micrometres. The steel containing both titanium and boron possessed the smallest ferrite grains and M3C carbides of the three examined. This is attributed to a fine dispersion of borides (TiB2) and borocarbides (Ti(C,B)) of size 10 nm in the ferrite matrix through the pinning effect. At the grain boundaries small carbide particles were present which were effective in inhibiting grain boundary migration. The extremely fine borides and/or borocarbides were useful in suppressing intragranular deformation of ferrite grains due to precipitation hardening. This may have assisted in promoting grain boundary sliding, resulting in superior superplastic elongation.

Original languageEnglish
Pages (from-to)1408-1413
Number of pages6
JournalMaterials Science and Technology
Volume15
Issue number12
DOIs
Publication statusPublished - Jan 1 1999

Fingerprint

Boron
Steel
Titanium
boron
titanium
steels
Boron Compounds
microstructure
Microstructure
Ferrite
ferrites
borides
Borides
grain boundaries
carbides
Carbides
Grain boundaries
thermomechanical treatment
Thermomechanical treatment
Grain boundary sliding

All Science Journal Classification (ASJC) codes

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

Cite this

Effects of co-addition of titanium and boron on microstructure of superplastic Cr-Mo steels. / Aramaki, Masatoshi; Onodera, R.; Era, H.; Kishitake, K.

In: Materials Science and Technology, Vol. 15, No. 12, 01.01.1999, p. 1408-1413.

Research output: Contribution to journalArticle

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N2 - The effects of titanium and boron on the microstructure of a low alloyed Cr-Mo steel with 0.6 wt-%C have been investigated by comparison with a steel containing only titanium and a steel free from both titanium and boron. Each of the steels was subjected to thermomechanical treatment and annealed at 700°C, resulting in small grains of size a few micrometres. The steel containing both titanium and boron possessed the smallest ferrite grains and M3C carbides of the three examined. This is attributed to a fine dispersion of borides (TiB2) and borocarbides (Ti(C,B)) of size 10 nm in the ferrite matrix through the pinning effect. At the grain boundaries small carbide particles were present which were effective in inhibiting grain boundary migration. The extremely fine borides and/or borocarbides were useful in suppressing intragranular deformation of ferrite grains due to precipitation hardening. This may have assisted in promoting grain boundary sliding, resulting in superior superplastic elongation.

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