TY - JOUR

T1 - Analysis of dislocation density by direct-fitting/modified Williamson-Hall (DF/mWH) method in tempered low-carbon martensitic steel

AU - MasuMura, Takuro

AU - Uranaka, Shohei

AU - Matsuda, Kyosuke

AU - Takaki, Setsuo

AU - tsuchiyaMa, Toshihiro

N1 - Publisher Copyright:
© 2020 The Iron and Steel Institute of Japan.

PY - 2020

Y1 - 2020

N2 - To calculate the dislocation density of tempered low-carbon martensitic steels (Fe-0.15%C alloy) by the direct-fitting/modified Williamson-Hall (DF/mWH) method, the unknown parameter A in tempered martensite was investigated. In the DF/mWH method, the dislocation density ρ is defined as ρ=2φ2/(πA2b2). Here, φ and b correspond to the slope of the DF/mWH plot and the magnitude of the Burgers vector, respectively. In low-carbon martensitic steels tempered at 573 - 873 K, φ and ρ were estimated by the DF/mWH method and the modified Williamson-Hall/Warren-Averbach method, respectively. As a result, these parameters decreased with increasing tempering temperature. By substituting φ and ρ in the above equation, the parameter A can be obtained as a function of the tempering parameter λ as follows: A = –1.53 × 10−5 × λ + 0.982 The parameter A in low-carbon martensitic steels tempered at 573 - 873 K for 18 ks was calculated to be 0.7 - 0.8. Using the parameters A and φ obtained by the DF/mWH method, dislocation density ρ can be easily estimated.

AB - To calculate the dislocation density of tempered low-carbon martensitic steels (Fe-0.15%C alloy) by the direct-fitting/modified Williamson-Hall (DF/mWH) method, the unknown parameter A in tempered martensite was investigated. In the DF/mWH method, the dislocation density ρ is defined as ρ=2φ2/(πA2b2). Here, φ and b correspond to the slope of the DF/mWH plot and the magnitude of the Burgers vector, respectively. In low-carbon martensitic steels tempered at 573 - 873 K, φ and ρ were estimated by the DF/mWH method and the modified Williamson-Hall/Warren-Averbach method, respectively. As a result, these parameters decreased with increasing tempering temperature. By substituting φ and ρ in the above equation, the parameter A can be obtained as a function of the tempering parameter λ as follows: A = –1.53 × 10−5 × λ + 0.982 The parameter A in low-carbon martensitic steels tempered at 573 - 873 K for 18 ks was calculated to be 0.7 - 0.8. Using the parameters A and φ obtained by the DF/mWH method, dislocation density ρ can be easily estimated.

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U2 - 10.2355/TETSUTOHAGANE.TETSU-2020-049

DO - 10.2355/TETSUTOHAGANE.TETSU-2020-049

M3 - Article

AN - SCOPUS:85096503190

VL - 106

SP - 826

EP - 834

JO - Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan

JF - Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan

SN - 0021-1575

IS - 11

ER -