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首页> 外文期刊>ISIJ international >Effects of Surface Microstructure on Selective Oxidation Morphology and Kinetics in N_2 + 5%H_2 Atmosphere with Variable Dew Point Temperature
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Effects of Surface Microstructure on Selective Oxidation Morphology and Kinetics in N_2 + 5%H_2 Atmosphere with Variable Dew Point Temperature

机译：表面微结构对可变露点温度的N_2 + 5％H_2气氛中选择性氧化形态和动力学的影响

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摘要

Starting surface microstructure has been shown to influence selective oxidation morphology and kinetics on cold-rolled grades of CMnSi advanced high strength steels (AHSSs). The research presented below examined this phenomenon after 120 and 1 800 s and under N_2 + 5%H_2 with 0℃ and -30℃ dewpoint temperatures (DPTs). Starting microstructures were altered by pre-annealing, which led to decarburization and grain growth. All samples were oxidized in a high temperature confocal scanning laser microscope (CSLM) at 850℃. External oxides were subsequently examined using secondary electron scanning electron microscopy (SE SEM) and energy-dispersive spectroscopy (EDS). Cross-sections were produced and examined in a focused ion beam scanning electron microscope (FIB-SEM). Oxidizing atmosphere, surface microstructure, and time all influenced selective oxidation behavior. High and low DPT atmospheres had expected effects. Variation between microstructures was only apparent in 1 800 s samples oxidized in a high DPT atmosphere. Decarburized samples oxidized at higher DPTs exhibited surfaces covered with discrete iron nodules which may facilitate reactive zinc wetting.
机译：原始表面微观结构已显示出对CMnSi高级高强度钢（AHSSs）冷轧钢种的选择性氧化形态和动力学的影响。下面介绍的研究在120和1800 s后以及在N_2 + 5％H_2和0℃和-30℃露点温度（DPT）下检查了这种现象。初始退火改变了初始的微观结构，导致脱碳和晶粒长大。所有样品均在850℃的高温共聚焦扫描激光显微镜（CSLM）上氧化。随后使用二次电子扫描电子显微镜（SE SEM）和能量分散光谱（EDS）检查外部氧化物。产生横截面并在聚焦离子束扫描电子显微镜（FIB-SEM）中检查。氧化气氛，表面微观结构和时间都影响选择性氧化行为。高低DPT气氛具有预期的效果。微观结构之间的差异仅在高DPT气氛下氧化的1800 s样品中才明显。在较高DPT下氧化的脱碳样品的表面覆盖着离散的铁结节，可能有助于反应性锌润湿。

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