Characterization of age hardening mechanism of low-temperature aged low-carbon steel by transmission electron microscopy

Kawahara, Yasuhito; Maeda, Takuya; Kinoshita, Keisuke; Takahashi, Jun; Sawada, Hideaki; Teranishi, Ryo; Kaneko, Kenji

doi:10.1016/j.matchar.2021.111579

Cited by 10 publications

(1 citation statement)

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“…Speich et al 14) reported the hardening behavior during tempering at 373 K in 0.18 mass% C martensitic steel, which is similar behavior to our specimens tempered at 373 K. They then explained the hardening mechanism with C segregation into dislocations. However, considering that the recent TEM study has revealed the age-hardening in a ferritic steel at low temperature was due to C-clusters or fine metastable carbides, 29) precipitation hardening may also play an important role in the hardening of the as-quenched and 373 K-tempered steels in this study. In fact, the 0.3C steel, where the C segregation already more pronounced in as-quenched state, exhibited the same degree of hardening as other higher C steels with less C segregation.…”

Section: Change In Hardness and Microstructure Duringmentioning

confidence: 70%

Quantitative Analysis of Hardening Due to Carbon in Solid Solution in Martensitic Steels

et al. 2023

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The relationship between hardness and solute carbon concentration estimated via electrical resistivity measurement was investigated in as-quenched and tempered martensitic steels containing carbon of 0.3-0.6 mass%. As a result of corelating the amount of hardening due to carbon in solid solution with the solute carbon concentration, by the calculation to subtract precipitation strengthening, grain refinement strengthening, dislocation strengthening, and softening due to retained austenite from the total strengthening, we derived an equation of solid solution strengthening, where the hardening increases proportionally to the 1/2 or 2/3 power of the solute carbon concentration. It was confirmed that the effects of the factors other than solid solution strengthening due to carbon on hardness are relatively small in tempered specimens when the tempering temperature is less than 673 K; therefore, the change in hardness in tempered martensitic steels can be mostly explained by solute carbon concentration regardless of carbon content.

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Section: Change In Hardness and Microstructure Duringmentioning

confidence: 70%