Liquation cracking resistance and microstructural characteristics leading to low susceptibility in borated stainless steels for neutron absorbers

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization Pub Date : 2024-11-19 DOI:10.1016/j.matchar.2024.114568

Gitae Park , Yongjoon Kang , Chan Kyu Kim , Seolbin Jeong , Jung-Min Kim , Sang Woo Song

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引用次数: 0

Abstract

This study presents a comprehensive investigation of liquation cracking resistance in Borated Stainless Steels (BSSs) within the compositional range of ASTM A887 grade. Thermomechanical simulation was utilized to evaluate their hot cracking characteristics, providing valuable insights into the microstructural aspects. Cylindrical specimens were prepared from the three types of hot-rolled BSS sheets with varying boron content. The Gleeble simulator was employed to conduct on-heating and on-cooling hot ductility tests, specifically replicating the thermal cycles of the weld heat-affected zone, with a focus on the partially melted zone. The reduction in area was quantified as a measure of ductility, and in-depth microstructural analysis was conducted to unveil the underlying mechanisms contributing to liquation cracking susceptibility. BSSs corresponding to 304B3, B4, and B5 generally exhibited a lower brittle temperature range, and an increase in boron content was found to slightly reduce cracking susceptibility. This research clarifies the issues of low liquation cracking susceptibility in BSSs, offering valuable insights that significantly enhance their industrial performance as neutron absorbers in disposal of used nuclear fuel and nuclear power plants.

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用于中子吸收器的硼化不锈钢的抗液化开裂性和导致低敏感性的微观结构特征

本研究全面考察了 ASTM A887 等级成分范围内硼酸盐不锈钢（BSS）的抗液化开裂性能。研究利用热力学模拟来评估它们的热裂纹特性，从而为微观结构方面提供有价值的见解。从三种不同硼含量的热轧 BSS 板材中制备了圆柱形试样。使用 Gleeble 模拟器进行加热和冷却热延展性试验，特别是复制焊接热影响区的热循环，重点是部分熔化区。面积的减少被量化为延展性的衡量标准，并进行了深入的微观结构分析，以揭示导致液化裂纹易发性的根本机制。与 304B3、B4 和 B5 相对应的 BSS 通常表现出较低的脆性温度范围，并且发现硼含量的增加会略微降低开裂敏感性。这项研究澄清了 BSS 的低液化开裂敏感性问题，提供了宝贵的见解，可显著提高其作为中子吸收剂处理废旧核燃料和核电厂的工业性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.