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論文

${it In situ}$ neutron diffraction study of phase stress evolution in a ferrous medium-entropy alloy under low-temperature tensile loading

Bae, J. W.*; Kim, J. G.*; Park, J. M.*; Woo, W.*; Harjo, S.; Kim, H. S.*

Scripta Materialia, 165, p.60 - 63, 2019/05

 被引用回数:20 パーセンタイル:80.06(Nanoscience & Nanotechnology)

Phase stress evolution of face-centered cubic (FCC) and deformation-induced body-centered cubic (BCC) phases was measured in recently developed ferrous medium-entropy alloy. This was done during tensile deformation at -137$$^{circ}$$C using ${it in situ}$ neutron diffraction measurement for the quantitative interpretation of the role of martensitic transformation on the improved low-temperature tensile properties. The strain-hardening rate curve exhibits two-stage hardening behavior, and the phase stress and stress contribution from the BCC phase increases significantly while that from FCC phase decreases during plastic deformation. This is a direct demonstration that BCC phase contributes significantly to the increase in strength and strain hardening.

口頭

Metastable austenitic steel deformation at low temperature

Harjo, S.; 川崎 卓郎; Gong, W.; 相澤 一也; 岩橋 孝明

no journal, , 

Austenitic stainless steel type 304 is well known as a metastable steel that may be transformed to have different crystal structures during plastic deformation leading increase in strength and elongation, i.e. transformation- induced plasticity (TRIP). TRIP in the JIS-SUS304 can be accelerated by decreasing the temperature for the deformation and increasing the strain rate, and the flow stresses are different by varying the temperatures, expecting that the transformation behavior may be different. To describe the relation between the flow stress and the transformation behavior, in situ neutron diffraction experiments during loading of the JIS-SUS304 at low temperatures are performed without any interruption, and time-resolving data will be discussed.

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