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

Nobuo Nakada, Junaidi Syarif, Toshihiro Tsuchiyama, 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 - 2005
    EventInternational Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005 - Phoenix, AZ
    Duration: 29 May 20053 Jun 2005

    Other

    OtherInternational Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005
    CityPhoenix, AZ
    Period29/5/053/6/05

    Fingerprint

    Austenite
    Mechanical properties
    Microstructure
    Steel
    Ductility
    Bearings (structural)
    Martensitic transformations
    Tensile testing
    Tempering
    Strain hardening
    Martensite
    Cryogenics
    Yield stress
    Elongation
    Tensile strength

    Keywords

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

    ASJC Scopus subject areas

    • Engineering(all)

    Cite this

    Nakada, N., Syarif, J., Tsuchiyama, T., & Takaki, S. (2005). Effect of Cu addition on microstructure and mechanical properties in 9%Ni steels. In J. M. Howe, D. E. Laughlin, J. K. Lee, U. Dahmen, & W. A. Soffa (Eds.), Proceedings of an International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005 (Vol. 1, pp. 449-460)

    Effect of Cu addition on microstructure and mechanical properties in 9%Ni steels. / Nakada, Nobuo; Syarif, Junaidi; Tsuchiyama, Toshihiro; Takaki, Setsuo.

    Proceedings of an International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005. ed. / J.M. Howe; D.E. Laughlin; J.K. Lee; U. Dahmen; W.A. Soffa. Vol. 1 2005. p. 449-460.

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

    Nakada, N, Syarif, J, Tsuchiyama, T & Takaki, S 2005, Effect of Cu addition on microstructure and mechanical properties in 9%Ni steels. in JM Howe, DE Laughlin, JK Lee, U Dahmen & WA Soffa (eds), Proceedings of an International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005. vol. 1, pp. 449-460, International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005, Phoenix, AZ, 29/5/05.
    Nakada N, Syarif J, Tsuchiyama T, Takaki S. Effect of Cu addition on microstructure and mechanical properties in 9%Ni steels. In Howe JM, Laughlin DE, Lee JK, Dahmen U, Soffa WA, editors, Proceedings of an International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005. Vol. 1. 2005. p. 449-460
    Nakada, Nobuo ; Syarif, Junaidi ; Tsuchiyama, Toshihiro ; Takaki, Setsuo. / Effect of Cu addition on microstructure and mechanical properties in 9%Ni steels. Proceedings of an International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005. editor / J.M. Howe ; D.E. Laughlin ; J.K. Lee ; U. Dahmen ; W.A. Soffa. Vol. 1 2005. pp. 449-460
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    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.",
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