Segregation behavior and phase instability of Eurofer97 after neutron irradiation to 72 dpa

JOURNAL OF NUCLEAR MATERIALS

卷:547

Article

Wang, Kun¹  Parish, Chad M.¹  Field, Kevin G.^1,2  Tan, Lizhen¹  Katoh, Yutai¹ 

[1] Oak Ridge Natl Lab, POB 2009, Oak Ridge, TN 37831 USA

[2] Univ Michigan, Ann Arbor, MI 48109 USA

关键词: Microstructures;    Neutron irradiation;    Phase instability;    Elemental segregation;    Analytical transmission electron microscopy;   

DOI  :  10.1016/j.jnucmat.2021.152834

来源: Elsevier

【 摘 要 】

A reduced activation ferritic/martensitic steel, Eurofer97, was neutron irradiated in the vicinity of 300 degrees C in the High Flux Isotope Reactor (HFIR) up to 72 dpa. Advanced analytical scanning transmission electron microscopy and conventional transmission electron microscopy were applied to investigate the radiation-induced segregation and phase instability behavior after neutron irradiation. Amorphization was observed in M23C6 carbides. Cr-rich clusters were seen within the matrix, near the lath boundaries and close to the M23C6 carbides. Cr enrichment and Fe depletion were detected at both prior austenite grain boundaries and lath boundaries, despite different segregation magnitude. In addition, the enrichment of Ni, the depletion of V, and tiny cavities (presumably helium bubbles) are also found at lath boundaries. This work interrogates the evolution of microstructures after neutron irradiation, which provides detailed understanding on the microstructural aspects controlling the mechanical integrity of Eurofer97 under high-dose neutron damage. (C) 2021 Elsevier B.V. All rights reserved.

【 授权许可】

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