Improvement of strengths - ductility balance by copper addition in 9%Ni steels

Nobuo Nakada, Junaidi Syarif, Toshihiro Tsuchiyama, Setsuo Takaki

Research output: Contribution to journalArticle

67 Citations (Scopus)

Abstract

Effect of Cu addition on mechanical properties of a cryogenic 9%Ni steel was studied by means of tensile testing, and then strength-ductility balance was discussed in the Cu bearing 9%Ni steel in connection with microstructural characteristics. Cu particles precipitated finely within martensite matrix on tempering. The Cu addition also increased the amount of reversed austenite formed along lath boundaries, because the Cu was condensed into the reversed austenite and changed the stability of austenite. On the other hand, yield strength and tensile strength of 9%Ni steel were increased by Cu addition owing to precipitation strengthening by the Cu particles without losing ductility. The improvement of uniform elongation by Cu addition was explained in terms of deformation-induced martensitic transformation of reversed austenite (TRIP assisted effect). It was concluded that the Cu addition increases the work-hardening rate through the TRIP assisted effect and suppresses the occurrence of necking deformation.

Original languageEnglish
Pages (from-to)137-144
Number of pages8
JournalMaterials Science and Engineering A
Volume374
Issue number1-2
DOIs
Publication statusPublished - 15 Jun 2004
Externally publishedYes

Fingerprint

Steel
ductility
Austenite
Ductility
Copper
austenite
steels
copper
Bearings (structural)
Martensitic transformations
Tensile testing
Tempering
Strain hardening
Martensite
work hardening
Cryogenics
tempering
Yield stress
martensitic transformation
Elongation

Keywords

  • 9%Ni steel
  • Copper
  • Precipitation strengthening
  • Reversed austenite
  • TRIP assisted effect
  • Work-hardening

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Improvement of strengths - ductility balance by copper addition in 9%Ni steels. / Nakada, Nobuo; Syarif, Junaidi; Tsuchiyama, Toshihiro; Takaki, Setsuo.

In: Materials Science and Engineering A, Vol. 374, No. 1-2, 15.06.2004, p. 137-144.

Research output: Contribution to journalArticle

Nakada, Nobuo ; Syarif, Junaidi ; Tsuchiyama, Toshihiro ; Takaki, Setsuo. / Improvement of strengths - ductility balance by copper addition in 9%Ni steels. In: Materials Science and Engineering A. 2004 ; Vol. 374, No. 1-2. pp. 137-144.
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