12% Cr铁素体-马氏体钢在BN-350快堆中辐照至53dpa时的低温结构不稳定性

IF 3 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materialia Pub Date : 2025-03-13 DOI:10.1016/j.mtla.2025.102393

K.V. Tsay , D.A. Merezhko , Y.R. Kim , M.S. Merezhko

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引用次数: 0

摘要

发现EP-450双相铁素体/马氏体钢（燃料组件包装材料）在BN-350反应堆中，在远低于回火温度（410℃）的温度下，与中子长期照射（至53 dpa）时遭受辐射诱导的恢复和再结晶。这导致了钢相组成的结构不稳定，包括回火马氏体分数的减少和铁素体晶粒的生长。辐照钢的显微组织表现为马氏体板条粗化和亚晶生长，以及具有准平衡y结的粗铁素体晶粒的出现。TM的应力和缺陷状态是恢复和再结晶过程的驱动力。由于点缺陷的通量和位错的高迁移率的存在，在辐照下可能促进了亚边界和亚晶粒合并的大量迁移，从而导致钢中的结构重排。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Low-temperature structural instability of 12 % Cr ferritic–martensitic steel irradiated to 53 dpa in the BN-350 fast reactor

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Low-temperature structural instability of 12 % Cr ferritic–martensitic steel irradiated to 53 dpa in the BN-350 fast reactor

The EP-450 duplex ferritic/martensitic steel (material of an fuel assemblies’ wrapper) was found to suffer from radiation-induced recovery and recrystallization during long-term irradiation (to 53 dpa) with neutrons in the BN-350 reactor at a much lower temperature (410 °C) than tempering ones. This resulted in the structural instability of the phase composition of the steel, involving a decrease in the tempered martensite fraction and the growth of ferritic grains. The microstructure of irradiated steel showed coarsening martensitic laths and the growth of sub-grains, as well as the appearance of coarse ferrite grains with quasi-equilibrium Y-junctions. The driving force of the processes of recovery and recrystallization was the more stressed and defective condition of the TM. Structural rearrangement in steel was performed due to a mass migration of sub-boundaries and sub-grain coalescence, which might be facilitated under irradiation by the presence of fluxes of point defects and a high mobility of dislocations.

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来源期刊

Materialia MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

6.40

自引率

2.90%

发文量

345

审稿时长

36 days

期刊介绍： Materialia is a multidisciplinary journal of materials science and engineering that publishes original peer-reviewed research articles. Articles in Materialia advance the understanding of the relationship between processing, structure, property, and function of materials. Materialia publishes full-length research articles, review articles, and letters (short communications). In addition to receiving direct submissions, Materialia also accepts transfers from Acta Materialia, Inc. partner journals. Materialia offers authors the choice to publish on an open access model (with author fee), or on a subscription model (with no author fee).