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Continuous and Discontinuous Yielding Behaviors in Ferrite-Cementite Steels

38 Pages Posted: 2 Jun 2020 Publication Status: Accepted

See all articles by Yanxu Wang

Yanxu Wang

National Institute for Materials Science - Innovative Structural Materials Association (ISMA)

Yo Tomota

National Institute for Materials Science - Innovative Structural Materials Association (ISMA); National Institute of Advanced Industrial Science and Technology (AIST)

Takahito Ohmura

National Institute for Materials Science - Innovative Structural Materials Association (ISMA)

Wu Gong

National Institute for Materials Science - Elements Strategy Initiative for Structural Materials (ESISM)

Stefanus Harjo

Japan Atomic Energy Agency - J-PARC Center; National Institute for Materials Science - Elements Strategy Initiative for Structural Materials (ESISM)

Masahiko Tanaka

National Institute for Materials Science - Synchrotron X-ray Station at SPring-8

Abstract

The continuous and discontinuous yielding behaviors in ferrite-cementite steels were complementarily investigated via nano- and macro-scale deformation examinations. The continuous yielding behavior was observed in heat-treated specimens with a lamellar or cementite-spheroidal structure even after strain-aging treatment. However, the discontinuous yielding behavior accompanied by the L├╝ders elongation appeared in ferrite-cementite steel that was recrystallized after cold rolling. The results obtained by electron microscopy, synchrotron X-ray, and neutron diffractions indicate that the ferrite-cementite interface of the heat-treated specimen is semi-coherent with a high internal stress field, whereas that of the recrystallized one is incoherent with a low internal stress field. Moreover, coherency strain, which depends on the total area of the ferrite-cementite interface, and thermal strain, which is governed by temperature, are the two factors that influence peak broadening. The nanoindentation tests revealed that the critical loads are significantly lower near the semi-coherent interface than those near the incoherent interface and the ferrite grain boundary; this suggests that dislocations are easily emitted from the semi-coherent interface.

Keywords: Yield behavior, Ferrite-cementite steel, Interface character, Nanoindentation, Neutron diffraction

Suggested Citation

Wang, Yanxu and Tomota, Yo and Ohmura, Takahito and Gong, Wu and Harjo, Stefanus and Tanaka, Masahiko, Continuous and Discontinuous Yielding Behaviors in Ferrite-Cementite Steels. Available at SSRN: https://ssrn.com/abstract=3604738 or http://dx.doi.org/10.2139/ssrn.3604738

Yanxu Wang (Contact Author)

National Institute for Materials Science - Innovative Structural Materials Association (ISMA) ( email )

Japan

Yo Tomota

National Institute for Materials Science - Innovative Structural Materials Association (ISMA)

Japan

National Institute of Advanced Industrial Science and Technology (AIST)

1-3-1 Kasumigaseki
Chiyoda-ku
Tokyo, 100-8921
Japan

Takahito Ohmura

National Institute for Materials Science - Innovative Structural Materials Association (ISMA)

Japan

Wu Gong

National Institute for Materials Science - Elements Strategy Initiative for Structural Materials (ESISM)

Japan

Stefanus Harjo

Japan Atomic Energy Agency - J-PARC Center ( email )

Japan

National Institute for Materials Science - Elements Strategy Initiative for Structural Materials (ESISM) ( email )

Japan

Masahiko Tanaka

National Institute for Materials Science - Synchrotron X-ray Station at SPring-8

Sayo
Japan

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