Effects of heat input on microstructure evolution and corrosion resistance of underwater laser cladding high-strength low-alloy steel coating

IF 4.8 2区 材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Materials Characterization Pub Date : 2024-10-28 DOI:10.1016/j.matchar.2024.114498
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Abstract

The effects of heat input on the microstructure evolution and corrosion resistance of the high-strength low-alloy (HSLA) steel coating obtained by wire-feed underwater laser cladding were studied. Optical digital microscope, scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), transmission electron microscope (TEM), electron back-scattered diffraction (EBSD), electrochemical tests, laser microscope and other characterization methods were used. As the heat input increased, the smoothness of the underwater cladding coating improved, with little changes in elemental distribution and phase composition. However, the content of acicular ferrite increased, while the amounts of lath bainite, lath martensite, and granular bainite decreased. As the heat input increased from 0.4 to 0.55 kJ/mm, the grain size increased from 25.3 to 55.9 μm, the proportion of low-angle grain boundaries rose from 61.3 % to 69.1 %, and the texture intensity of the (110) crystal plane increased from 16.22 to 23.83. Meanwhile, the dislocation density decreased from 4.9 × 1014 to 4.1 × 1014 m−2. These changes enhanced the corrosion resistance of underwater coating. As the heat input increased from 0.4 to 0.55 kJ/mm, the corrosion current density decreased from 2.13 × 10−5 to 3.35 × 10−6 A/cm2, and the corrosion potential increased from −0.823 to −0.529 V. Additionally, the depth-to-width ratio of the corrosion pits decreased from 0.255 to 0.053. This study laid the foundation for high-quality in-situ underwater repairs of ships and submarines made of high-strength steel.
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热输入对水下激光熔覆高强度低合金钢涂层微观结构演变和耐腐蚀性的影响
研究了热量输入对水下激光熔覆高强度低合金(HSLA)钢涂层微观结构演变和耐腐蚀性能的影响。采用了光学数码显微镜、扫描电子显微镜(SEM)、能量色散 X 射线光谱(EDS)、X 射线衍射(XRD)、透射电子显微镜(TEM)、电子背散射衍射(EBSD)、电化学测试、激光显微镜等表征方法。随着热输入的增加,水下包覆层的光滑度有所提高,元素分布和相组成变化不大。不过,针状铁素体的含量有所增加,而板条贝氏体、板条马氏体和粒状贝氏体的含量则有所减少。随着热输入从 0.4 kJ/mm 增加到 0.55 kJ/mm,晶粒尺寸从 25.3 μm 增加到 55.9 μm,低角度晶界比例从 61.3 % 增加到 69.1 %,(110) 晶面的纹理强度从 16.22 增加到 23.83。同时,位错密度从 4.9 × 1014 m-2 降至 4.1 × 1014 m-2。这些变化增强了水下涂层的耐腐蚀性。当输入热量从 0.4 kJ/mm 增加到 0.55 kJ/mm 时,腐蚀电流密度从 2.13 × 10-5 下降到 3.35 × 10-6 A/cm2,腐蚀电位从 -0.823 V 上升到 -0.529 V,此外,腐蚀坑的深宽比从 0.255 下降到 0.053。这项研究为高强度钢制成的舰船和潜艇的高质量水下原位修复奠定了基础。
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来源期刊
Materials Characterization
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.
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