Tensile behavior of TRIP-aided multi-phase steels studied by in situ neutron diffraction

Journal Article · Wed Dec 01 04:00:00 EST 2004 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2004.08.016· OSTI ID:20634813

Tomota, Y ^[1]; Tokuda, H ^[2]; Adachi, Y ^[3]; Wakita, M ^[3]; Minakawa, N ^[4]; Moriai, A ^[4]; Morii, Y ^[4]

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1. Institute of Applied Beam Science, Graduate School of Science and Engineering, Ibaraki University, 4-12-1 Nakanarusawa-machi, Hitachi, Ibaraki 326-8511 (Japan)
2. Graduate Student of Ibaraki University, 4-12-1 Nakanarusawa-machi, Hitachi, Ibaraki 326-8511 (Japan)
3. Sumitomo Metal Industries Ltd., 1-8 Fuso-cho, Amagasaki 660-0891 (Japan)
4. Japan Atomic Energy Research Institute, Tokai-mura, Naka-gun, Ibaraki 319-1195 (Japan)

TRIP-aided multi-phase steels were made by thermo-mechanically controlled process, where the ferrite grain size and the amount of the retained austenite were changed by controlling process conditions. The tensile behavior of four steels was studied by in situ neutron diffraction. It is found that the retained austenite bearing about 1.0 wt% C is plastically harder than the ferrite matrix. The steel with a ferrite grain size of {approx}2.0 {mu}m showed tensile strength of 1.1 GPa and a uniform elongation of 18.4%, in which stress-induced martensitic transformation occurs during plastic deformation but a considerable amount of austenite remains even after the onset of necking. It is concluded that the enhancement of uniform elongation is caused mainly by the work-hardening due to the hard austenite and martensite, where the contribution of the transformation strain is negligible.

• OSTI ID: 20634813
• Journal Information: Acta Materialia, Journal Name: Acta Materialia Journal Issue: 20 Vol. 52; ISSN 1359-6454; ISSN ACMAFD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AUSTENITE
ELONGATION
FERRITE
GRAIN SIZE
MARTENSITE
NEUTRON DIFFRACTION
PHASE TRANSFORMATIONS
PRESSURE RANGE GIGA PA
STEELS
STRAIN HARDENING
STRAINS
STRESSES
TENSILE PROPERTIES