Quantitative Characterization of Grain Boundaries in Ultrafine-Grained Austenitic Stainless Steel by Cluster Analysis

IF 1.8 4区材料科学 Q2 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Physical Mesomechanics Pub Date : 2023-08-08 DOI:10.1134/S1029959923040045

P. V. Kuznetsov, A. V. Stolbovsky, I. V. Belyaeva

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Abstract

A method is proposed for analyzing the relative energy distributions of grain boundaries in ultrafine-grained materials measured by grain boundary grooving using a scanning tunneling microscope. The grain boundary energy distribution in a grain boundary ensemble is considered as a superposition of individual distributions or populations, which can be identified by cluster analysis based on statistical criteria and each of which has its own average energy, variance, and share in the total distribution. The analysis is performed for 12Cr15Mn9NiCu steel with a coarse-grained structure in the as-received state and with an ultrafine-grained structure produced by hot helical rolling and subsequent cold rolling. It is shown that the number of boundary populations and their main characteristics revealed by clustering depend on the steel structure. The results of cluster analysis of experimental distributions are compared with the EBSD measurement data on grain boundary misorientation distributions. Discrepancy between the clustering results for the energy and misorientation distributions of grain boundaries is discussed taking into account the difference in the type of information obtained.

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用聚类分析定量表征超细晶奥氏体不锈钢的晶界

提出了一种利用扫描隧道显微镜对晶界开槽测量的超细晶材料的晶界相对能量分布进行分析的方法。晶界系综中的晶界能量分布被认为是单个分布或总体的叠加，可以通过基于统计准则的聚类分析来识别，每个分布都有自己的平均能量、方差和在总分布中的份额。对12Cr15Mn9NiCu钢进行了分析，该钢在接收状态下为粗晶组织，在热斜轧和随后的冷轧过程中形成超细晶组织。结果表明，聚类所揭示的边界种群数量及其主要特征与钢结构有关。将实验分布的聚类分析结果与EBSD测量的晶界取向偏差分布数据进行了比较。考虑到所获得的信息类型的不同，讨论了晶界能量分布和取向错分布的聚类结果之间的差异。

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来源期刊

Physical Mesomechanics Materials Science-General Materials Science

CiteScore

3.50

自引率

18.80%

发文量

期刊介绍： The journal provides an international medium for the publication of theoretical and experimental studies and reviews related in the physical mesomechanics and also solid-state physics, mechanics, materials science, geodynamics, non-destructive testing and in a large number of other fields where the physical mesomechanics may be used extensively. Papers dealing with the processing, characterization, structure and physical properties and computational aspects of the mesomechanics of heterogeneous media, fracture mesomechanics, physical mesomechanics of materials, mesomechanics applications for geodynamics and tectonics, mesomechanics of smart materials and materials for electronics, non-destructive testing are viewed as suitable for publication.