CF8M 不锈钢中 b.c.c.-f.c.c.取向关系与奥氏体形态之间的联系。

IF 6.1 3区 材料科学 Q1 Biochemistry, Genetics and Molecular Biology
Maxime Mollens, Adrien Guery, Dominique Loisnard, François Hild, Stéphane Roux
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引用次数: 0

摘要

慢冷 CF8M 双相不锈钢用于核反应堆一级冷却剂管道的关键部件。这种钢可以承受严酷的使用条件,但在长期老化(数十载)后往往会变得更脆。因此,了解其具体的微观结构和时间演变至关重要。电子反向散射衍射(EBSD)分析表明,这种钢的微观结构由毫米级的铁素体晶粒组成,在这些晶粒内部生长着奥氏体板条包,其优选结晶取向与远离铁素体晶界的母体铁素体相有关。在这些奥氏体相成核的板条包中,板条形态和晶体取向适应了两种铁素体取向。总体而言,与其他经典取向关系相比,皮氏取向关系似乎与实验数据最为吻合。奥氏体板条包是平行的板状板条,以其法线 n 为特征。与 EBSD 测得的三维晶体取向相反,即使 n 只能从观测面上部分得知,我们仍引入了一种新方法来阐明粗糙界面下 n 与晶体取向之间的预期关系。检索到的法线 n 分布集中在一组离散的取向上。假设铁素体和奥氏体服从皮氏取向关系,则确定的板条法线接近于由相同取向关系给出的母相不变方向。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Link between b.c.c.-f.c.c. orientation relationship and austenite morphology in CF8M stainless steel.

Slow-cooled CF8M duplex stainless steel is used for critical parts of the primary coolant pipes of nuclear reactors. This steel can endure severe service conditions, but it tends to become more brittle upon very long-term aging (tens of years). Therefore, it is essential to understand its specific microstructure and temporal evolution. As revealed by electron backscatter diffraction (EBSD) analyses, the microstructure consists of millimetre-scale ferritic grains within which austenite lath packets have grown with preferred crystallographic orientations concerning the parent ferritic phase far from the ferrite grain boundaries. In these lath packets where the austenite phase is nucleated, the lath morphology and crystal orientation accommodate the two ferrite orientations. Globally, the Pitsch orientation relationship appears to display the best agreement with the experimental data compared with other classical relationships. The austenite lath packets are parallel plate-shaped laths, characterized by their normal n. A novel methodology is introduced to elucidate the expected relationship between n and the crystallographic orientation given the coarse interfaces, even though n is only partly known from the observation surface, in contrast to the 3D crystal orientations measured by EBSD. The distribution of retrieved normals n is shown to be concentrated over a set of discrete orientations. Assuming that the ferrite and austenite obey the Pitsch orientation relationship, the determined lath normals are close to an invariant direction of the parent phase given by the same orientation relationship.

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来源期刊
CiteScore
10.00
自引率
3.30%
发文量
178
审稿时长
4.7 months
期刊介绍: Many research topics in condensed matter research, materials science and the life sciences make use of crystallographic methods to study crystalline and non-crystalline matter with neutrons, X-rays and electrons. Articles published in the Journal of Applied Crystallography focus on these methods and their use in identifying structural and diffusion-controlled phase transformations, structure-property relationships, structural changes of defects, interfaces and surfaces, etc. Developments of instrumentation and crystallographic apparatus, theory and interpretation, numerical analysis and other related subjects are also covered. The journal is the primary place where crystallographic computer program information is published.
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