通过母相重构对铅铋共晶中 15-15Ti 奥氏体钢的选择性浸出和铁素体化的新认识

IF 5.3 2区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Scripta Materialia Pub Date : 2024-08-26 DOI:10.1016/j.scriptamat.2024.116316
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引用次数: 0

摘要

在暴露于铅铋共晶的奥氏体钢的溶解腐蚀过程中,广泛观察到伴随铁素体化的选择性浸出现象。本研究提出了一种精炼的选择性浸出机制,涉及固态扩散和溶解-重熔过程。极点图分析表明,铁素体化遵循 Nishiyama-Wassermann 取向关系,与腐蚀环境或腐蚀行为无关。此外,奥氏体重构分析表明,铁素体的生长受到随机高角度晶界错位的阻碍。因此,上述结果表明,铁素体化最初是由固态扩散驱动的。随着晶粒内 LBE 通道的打开,铁素体的进一步生长受到溶解-再沉淀机制的帮助。此外,还观察到在Σ3孪晶边界形成了双取向铁素体晶粒,并讨论了这种形成对晶界和铁素体取向的选择性。
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New insights into selective leaching and ferritization in 15-15Ti austenitic steel in lead-bismuth eutectic through parent phase reconstruction

Selective leaching accompanied by ferritization is widely observed in the dissolution corrosion of austenitic steels exposed to lead-bismuth eutectic. This study proposes a refined mechanism for selective leaching involving solid-state diffusion followed by dissolution-reprecipitation processes. Pole figure analysis reveals that ferritization follows the Nishiyama-Wassermann orientation relationship, independent of corrosion environment or corrosion behavior. Moreover, austenite reconstruction analysis shows that the growth of ferrite is hindered by the misfits at random high-angle grain boundaries. Hence the above results suggest that ferritization is initially driven by solid-state diffusion. As LBE channels open within the grains, further growth of ferrite is assisted by the dissolution-reprecipitation mechanism. Additionally, the formation of dual-oriented ferrite grains at Σ3 twin boundary is observed, and the selectivity of this formation with respect to grain boundary and ferrite orientation is discussed.

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来源期刊
Scripta Materialia
Scripta Materialia 工程技术-材料科学:综合
CiteScore
11.40
自引率
5.00%
发文量
581
审稿时长
34 days
期刊介绍: Scripta Materialia is a LETTERS journal of Acta Materialia, providing a forum for the rapid publication of short communications on the relationship between the structure and the properties of inorganic materials. The emphasis is on originality rather than incremental research. Short reports on the development of materials with novel or substantially improved properties are also welcomed. Emphasis is on either the functional or mechanical behavior of metals, ceramics and semiconductors at all length scales.
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