Contribution of soft cu particles to tensile deformation behavior in iron

Yuta Imanami, Masahiro Murakami, Nobuo Nakada, Toshihiro Tsuchiyama, Setsuo Takaki

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

Abstract

Dispersion strengthening is one of the most cffcctivc strengthening methods in metals. In particular, many kinds of hard particles, such as carbide and oxide, have been applied as dispersed particle in structural steel. On the other hand, precipitation of Cu, which is softer than the ferritc matrix, also draws attention as dispersed particle for strengthening, because nano-sized Cu particles arc easily dispersed uniformly by aging heat treatment within matrix, and besides, its Ostwald growth ripening is very slow. In this study, Cu and VC-dispcrsed ferritic steels with an identical yield strength were prepared, and then subjected to tensile testing and cold rolling in order to compare the effects of soft Cu and hard carbide (VC) particles on tensile deformation behavior of iron. As a result, Cu-dispcrscd steel exhibited lower work hardening rate and larger elongation. In particular, the local elongation is significantly larger than VC-dispersed steel. TEM observation reveals that the shape of VC within ferritc matrix is unchanged even after severe cold deformation and that tangled dislocation structure develops around VC panicles. This leads to the large work hardening rate is formed in carbide-dispersed steel. On the contrary. Cu particles were clearly elongated along the deformation direction with own plastic deformation in high strain region. For example, the average aspect ratio of the deformed Cu particles was elongated up to 7.2 after 70% cold rolling. In addition, tangled dislocation was hardly observed around the particles. Therefore, it is concluded that the large local elongation of Cu-dispcrscd steel is derived from the plastic deformation of Cu particles resulting in the reduction of the stress concentration at (ferritc / particle) interface and the formation of a void there.

Original languageEnglish
Title of host publicationProceedings of the 17th IFHTSE Congress
PublisherThe Japan Society for Heat Treatment (JSHT)
Pages526-528
Number of pages3
ISBN (Electronic)9780000000002
Publication statusPublished - Jan 1 2008
Event17th International Federation for Heat Treatment and Surface Engineering Congress 2008, IFHTSE 2008 - Kobe, Japan
Duration: Oct 26 2008Oct 28 2008

Publication series

NameProceedings of the 17th IFHTSE Congress
Volume2

Other

Other17th International Federation for Heat Treatment and Surface Engineering Congress 2008, IFHTSE 2008
CountryJapan
CityKobe
Period10/26/0810/28/08

Fingerprint

tensile deformation
Steel
Iron
iron
Carbides
Elongation
Cold rolling
Strengthening (metal)
steels
Strain hardening
Plastic deformation
carbides
elongation
cold rolling
work hardening
Ferritic steel
Tensile testing
Oxides
plastic deformation
Yield stress

All Science Journal Classification (ASJC) codes

  • Surfaces, Coatings and Films
  • Condensed Matter Physics
  • Mechanics of Materials

Cite this

Imanami, Y., Murakami, M., Nakada, N., Tsuchiyama, T., & Takaki, S. (2008). Contribution of soft cu particles to tensile deformation behavior in iron. In Proceedings of the 17th IFHTSE Congress (pp. 526-528). (Proceedings of the 17th IFHTSE Congress; Vol. 2). The Japan Society for Heat Treatment (JSHT).

Contribution of soft cu particles to tensile deformation behavior in iron. / Imanami, Yuta; Murakami, Masahiro; Nakada, Nobuo; Tsuchiyama, Toshihiro; Takaki, Setsuo.

Proceedings of the 17th IFHTSE Congress. The Japan Society for Heat Treatment (JSHT), 2008. p. 526-528 (Proceedings of the 17th IFHTSE Congress; Vol. 2).

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

Imanami, Y, Murakami, M, Nakada, N, Tsuchiyama, T & Takaki, S 2008, Contribution of soft cu particles to tensile deformation behavior in iron. in Proceedings of the 17th IFHTSE Congress. Proceedings of the 17th IFHTSE Congress, vol. 2, The Japan Society for Heat Treatment (JSHT), pp. 526-528, 17th International Federation for Heat Treatment and Surface Engineering Congress 2008, IFHTSE 2008, Kobe, Japan, 10/26/08.
Imanami Y, Murakami M, Nakada N, Tsuchiyama T, Takaki S. Contribution of soft cu particles to tensile deformation behavior in iron. In Proceedings of the 17th IFHTSE Congress. The Japan Society for Heat Treatment (JSHT). 2008. p. 526-528. (Proceedings of the 17th IFHTSE Congress).
Imanami, Yuta ; Murakami, Masahiro ; Nakada, Nobuo ; Tsuchiyama, Toshihiro ; Takaki, Setsuo. / Contribution of soft cu particles to tensile deformation behavior in iron. Proceedings of the 17th IFHTSE Congress. The Japan Society for Heat Treatment (JSHT), 2008. pp. 526-528 (Proceedings of the 17th IFHTSE Congress).
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