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Research Papers

Tensile Flow Behavior of 9Cr–2WVTa Reduced-Activation Ferritic/Martensitic Steel

[+] Author and Article Information
Hamidreza Najafi

Assistant Professor
Department of Materials Engineering,
Science and Research Branch,
Islamic Azad University,
Tehran 14515-755, Iran
e-mail: hnajafi@srbiau.ac.ir

Contributed by the Materials Division of ASME for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received October 19, 2015; final manuscript received January 14, 2016; published online February 5, 2016. Assoc. Editor: Tetsuya Ohashi.

J. Eng. Mater. Technol 138(3), 031003 (Feb 05, 2016) (5 pages) Paper No: MATS-15-1266; doi: 10.1115/1.4032560 History: Received October 19, 2015; Revised January 14, 2016

Tensile flow behavior of 9Cr–2WVTa ferritic/martensitic (RAFM) steel in normalized-tempered condition has been studied based on Voce equation over the temperature range of 25–600 °C. Yield strength (YS) and ultimate tensile strength (UTS) decrease with increase in temperature. However, the elongation decreases with increase in temperature up to 400 °C and then increases beyond 400 °C. True stress–true plastic strain curves at all temperatures are adequately described by the Voce equation. While saturation stress (σs) decreases with temperature, the rate at which the stress approaches the saturation value (nV) increases with temperature. The variation of the stress increment up to saturation stress (σun) with temperature shows a plateau in the temperature range of 200–400 °C. Moreover, the product of σun and nVun·nV) is inversely proportional to the elongation. The relation of elongation to σun·nV can be described by a power law with the exponent of −1.63.

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Figures

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Fig. 1

Variation of YS and UTS of the RAFM steel with temperature

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Fig. 2

Variation in the percent elongation of the RAFM steel with temperature

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Fig. 3

True stress–true plastic strain curves of the RAFM steel at (a) 25–400 °C and (b) 500 and 600 °C

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Fig. 4

Variation of (a) saturation stress (σs) and (b) nV of the RAFM steel with temperature

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Fig. 5

Variation of stress increment up to saturation stress (σun) of the RAFM steel with temperature

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Fig. 6

Variation of stress increment up to saturation stress (σun) of a 9Cr–1Mo and 9Cr–2WVTa (RAFM) steel with temperature based on the initial stress (σi) and saturation stress (σs) obtained by Choudhary et al. [10] and Vanaja et al. [16]

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Fig. 7

Variation of the product of stress increment up to saturation stress (σun) and nV with temperature in the RAFM steel

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Fig. 8

Variation in the percent elongation of the RAFM steel with the product of stress increment up to saturation stress (σun) and nV. The fitted curve is also shown in the figure.

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