Influence of carbon content on superplastic behaviour in Ti and B doped Cr-Mo steels

Masatoshi Aramaki, Osamu Nakai, Ryuuta Onodera, Kenji Higashida

Research output: Contribution to journalArticle

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Abstract

Superplasticity has been investigated in various ferrous alloys and steels. However, in these materials, especially in the hypoeutectoid steel bellow A 1 temperature, the relationship between the content of carbon and elongation to failure is not obvious. In the present investigation, the influence of carbon content on superplastic behaviour is studied using carbon steels based on Cr-Mo steel. In order to obtain the fine grain structure, a small amount of Ti and B were added and the content of carbon was controlled to be in the range of 0.24% to 0.83%. The largest value of elongation to failure was 644% which was obtained by the tensile test of the specimen containing 0.58% carbon. The temperature and strain rate at which the maximum value was obtained were 710°C and 5×10 -4 s -1 , respectively. Of all the specimens, this specimen had the minimum grain size. Moreover, the area fraction of carbide took the maximum value at the temperature where the largest elongation value was obtained. These results show that the addition of carbon has an effect on grain refinement by formation of carbide, but excess amounts of carbons (>0.6%) bring about premature failure because of coarse microstructure and larger carbide.

Original languageEnglish
Pages (from-to)43-48
Number of pages6
JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Volume83
Issue number12
Publication statusPublished - Dec 1 1997

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Steel
Carbon
steels
carbon
carbides
elongation
Carbides
Elongation
superplasticity
bellows
Bellows
Superplasticity
Iron alloys
Grain refinement
Crystal microstructure
carbon steels
tensile tests
Temperature
strain rate
Carbon steel

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry

Cite this

Influence of carbon content on superplastic behaviour in Ti and B doped Cr-Mo steels. / Aramaki, Masatoshi; Nakai, Osamu; Onodera, Ryuuta; Higashida, Kenji.

In: Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan, Vol. 83, No. 12, 01.12.1997, p. 43-48.

Research output: Contribution to journalArticle

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