Effect of Cu addition on microstructure and mechanical properties in 9%Ni steels

Nobuo Nakada, Junaidi Syarif, Toshihiro Tsuchiyma, Setsuo Takaki

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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
Title of host publicationProceedings of an International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005
EditorsJ.M. Howe, D.E. Laughlin, J.K. Lee, U. Dahmen, W.A. Soffa
Pages449-460
Number of pages12
Volume1
Publication statusPublished - Dec 1 2005
EventInternational Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005 - Phoenix, AZ, United States
Duration: May 29 2005Jun 3 2005

Other

OtherInternational Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005
CountryUnited States
CityPhoenix, AZ
Period5/29/056/3/05

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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