Effects of Solute Carbon on the Work Hardening Behavior of Lath Martensite in Low-Carbon Steel

Niino, Taku; Inoue, Junya; Ojima, Masahiro; Nambu, Shoichi; Koseki, Takafumi

doi:10.2355/tetsutohagane.tetsu-2019-109

Cited by 2 publications

(2 citation statements)

References 26 publications

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“…Noriyuki TSUCHIDA, 1) * Shota KURAMOTO, 2) Rintaro UEJI, 3) Wu GONG, 4) Stefanus HARJO, 4) Kosuke HIROI 4) and Yukihiko KAWAMURA 4) the precipitation behavior of carbides during tempering and reported that carbide precipitation was suppressed when prestraining was applied to the as-quenched martensite. Those studies reported that the precipitation behavior of carbides during low-temperature tempering was closely related to changes in the mechanical properties of martensitic steels.…”

Section: Change In Mechanical Properties Of High-strength Martensitic...mentioning

confidence: 99%

“…Martensite is one of the most important microstructures in steels and is also a key constituent in providing the high strength and large elongation in advanced high-strength steels. [1][2][3][4] Martensitic steels are usually quenched and tempered to improve their mechanical properties for use in various applications. 5) However, the elastic limit (EL) and yield strength (YS, 0.2% proof strength) of as-quenched martensitic steels are low, and thus are the subject of extensive research.…”

Section: Introductionmentioning

confidence: 99%

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Change in Mechanical Properties of High-Strength Martensitic Steel by the Combination of Pre-strain and Deformation Temperature

Tsuchida,

Kuramoto,

Ueji

et al. 2024

ISIJ Int.

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The effects of pre-strain on the mechanical properties of high-strength martensitic steels were investigated using either strain tempering (ST) or quenching and tempering (QT) samples. In the tensile tests at deformation temperatures between 296 and 573 K, the ST sample exhibited an increase in both the tensile strength (TS) and uniform elongation (U.El) at 473 to 523 K, whereas the QT sample showed an increase in U.El with little change in the TS and yield strength (YS). The results of in situ neutron diffraction experiments revealed an increase in the stress partitioning to the bcc phase with an increase in the deformation temperature from 296 to 523 K. The difference in the phase stress between the bcc and cementite phases decreased with an increase in the temperature due to the decrease in the cementite strength. Pre-strain of 0.5% increased the YS at 296 K with a slight work hardening; the initial dislocation density (ρ) decreased at 523 K, but increased significantly after yielding, leading to a better combination of TS and U.El. The combination of pre-strain, tempering, and deformation temperatures caused the change in ρ before deformation and the increase in ρ after yielding of the martensitic steel.

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Section: Change In Mechanical Properties Of High-strength Martensitic...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Change in Mechanical Properties of High-Strength Martensitic Steel by the Combination of Pre-strain and Deformation Temperature

Tsuchida,

Kuramoto,

Ueji

et al. 2024

ISIJ Int.

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Effects of Manganese on Microstructure and Work-hardening Behavior of Low-carbon Lath Martensitic Steel

Ueno,

Fujimura,

Mitsuhara

et al. 2024

Tetsu-to-Hagane

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Microstructures of lath martensite have been studied intensively to understand their effect on the mechanical properties of steels. It is, however, said that the relation between microstructural factors and mechanical properties has not been clarified yet. The plastic deformation behavior of fully lath martensitic steels has become important because they are applied to automobile body structures such as bumper reinforcement. It is, therefore, important to understand the microstructural factors that control the work-hardening behavior of fully martensitic steels. Although we could not clarify differences in microstructural factors when manganese (Mn) concentrations of steels are altered, the work-hardening of 8 mass%Mn martensitic steel is much higher than that of 5 mass%Mn martensitic steel. It was found using the digital image correlation (DIC) method, that the strain concentration due to the in-lath-plane slip deformation is more developed in 5 mass%Mn martensitic steel than 8 mass%Mn martensitic steel. Transmission electron microscope (TEM) observations revealed the existence of two types of fine twins inside laths. Long twins that are parallel to the longitude of the lath are observed both in 5 mass%Mn and 8 mass%Mn martensitic steels. Short twins that partially cross the laths, on the other hand, can only be found in 8 mass%Mn martensitic steel. Since twin boundaries are high angle boundaries, the short twins are supposed to prevent the development of in-lath-plane slip deformation. This seems to be the mechanism of higher work-hardening behavior observed in 8 mass%Mn martensitic steel.

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Effects of Solute Carbon on the Work Hardening Behavior of Lath Martensite in Low-Carbon Steel

Cited by 2 publications

References 26 publications

Change in Mechanical Properties of High-Strength Martensitic Steel by the Combination of Pre-strain and Deformation Temperature

Change in Mechanical Properties of High-Strength Martensitic Steel by the Combination of Pre-strain and Deformation Temperature

Effects of Manganese on Microstructure and Work-hardening Behavior of Low-carbon Lath Martensitic Steel

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