Effect of surface nanocrystallization induced by mechanical grinding treatment on stress corrosion cracking behavior of 316 L austenitic stainless steel in boiling MgCl2 solution

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

Materials Characterization Pub Date : 2024-10-18 DOI:10.1016/j.matchar.2024.114458

Chongwen Yang , Xinli Jiang , Wenqian Zhang , Xuelin Wang

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Abstract

The effect of surface nanocrystallization prepared by surface mechanical grinding treatment (SMGT) on stress corrosion cracking (SCC) behavior of 316 L austenitic stainless steel was studied in boiling MgCl₂ solutions at 155 °C and 130 °C, respectively. The refined-grain structures of different morphologies produced by three different SMGT penetration depths were employed to assess how different microstructures and corrosive environments affected the SCC behavior of nanocrystallized surfaces. Results showed that in the 155 °C boiling MgCl₂ solution, the refinement of grains resulted in an increase in the critical stress for SCC initiation and progressively enhanced the ability to inhibit crack propagation with the SMGT penetration depth increasing from 20 μm to 60 μm. In the 130 °C MgCl₂ solution, the grain refinement still contributed to resisting crack propagation, but the threshold stress for SCC initiation on the surface with the deepest SMGT penetration depth of 60 μm was lower than that in the 155 °C MgCl₂ solution. This behavior was attributed to the significant martensitic phase transformation formed in SMGT with penetration depth of 60 μm, resulting in the mechanism of SCC transforming from anodic dissolution in MgCl₂ solution at 155 °C to hydrogen embrittlement at 130 °C.

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机械研磨处理诱导的表面纳米结晶对沸腾氯化镁溶液中 316 L 奥氏体不锈钢应力腐蚀开裂行为的影响

分别在 155 ℃ 和 130 ℃ 的沸腾氯化镁溶液中研究了通过表面机械研磨处理（SMGT）制备的表面纳米结晶对 316 L 奥氏体不锈钢应力腐蚀开裂（SCC）行为的影响。采用三种不同的 SMGT 穿透深度所产生的不同形态的细化晶粒结构来评估不同的微观结构和腐蚀环境如何影响纳米结晶表面的 SCC 行为。结果表明，在 155 °C 沸腾氯化镁溶液中，晶粒细化导致 SCC 发生的临界应力增加，并且随着 SMGT 穿透深度从 20 μm 增加到 60 μm，抑制裂纹扩展的能力逐渐增强。在 130 ℃ MgCl2 溶液中，晶粒细化仍有助于抵抗裂纹扩展，但在 SMGT 穿透深度最深为 60 μm 的表面上，SCC 引发的阈值应力低于 155 ℃ MgCl2 溶液中的阈值应力。出现这种情况的原因是在渗透深度为 60 μm 的 SMGT 中形成了显著的马氏体相变，导致 SCC 的机理从 155 ℃ 时氯化镁溶液中的阳极溶解转变为 130 ℃ 时的氢脆。

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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.