Stress Partitioning Behavior of Duplex Alloys Consisting of BCC and FCC Phases at Low Temperature

JPS Conf. Proc. 33, 011064 (2021) [6 pages]

Proceedings of the 3rd J-PARC Symposium (J-PARC2019)

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Takayuki Yamashita¹^,*, Shohei Tomono², Satoshi Morooka¹, Stefanus Harjo¹^,^†, Takuro Kawasaki¹, Tatsuya Nameki³, Norimitsu Koga⁴, and Osamu Umezawa⁵

¹J-PARC Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan

²Graduate School of Engineering, Yokohama National University, Yokohama 240-8501, Japan

³Micron EN project Office, Obayashi Corporation, Higashi-Hiroshima, Hiroshima 739-0152, Japan

⁴Faculty of Mechanical Engineering, Kanazawa University, Kanazawa 920-1192, Japan

⁵Faculty of Engineering, Yokohama National University, Yokohama 240-8501, Japan

Received November 28, 2019

In situ neutron diffraction measurements during tensile testing at room temperature and low temperature of a duplex stainless steel consisting of BCC and FCC phases have been performed. The deformation behavior, phase stresses and contributions of the constituent phases to the strength were analyzed and discussed. The steel showed good balance of strength and ductility at 200 K, and the phase stresses of the constituent phases at 200 K are larger than those at room temperature. Although the contributed stress to the strength of BCC phase was higher than that of FCC phase, the contribution portion to the strength of each constituent phases remained nearly constant as the test temperature changed. The strengthening with decreasing test temperature occurred in both BCC and FCC phases enhancing the work-hardening rate of the steel at low temperature.

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https://doi.org/10.7566/JPSCP.33.011064

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