摘要
利用光学显微镜、扫描电镜、能谱和XRD衍射物相分析等手段,研究了SPA-H钢经连铸连轧后表面黄色锈斑的形成原因。结果表明,黄色锈斑的外层主要由Fe2O3、里层由FeO组成,在钢板表面呈条带状分布;而无黄色锈斑的钢板表面主要是由FeO组成。黄色锈斑是由于在轧制过程中,钢表面的高温氧化产物(FeO)破裂,在随后的冷却过程中破裂处特别是裂纹的尖端形成大量的Fe2O3所致,高温氧化产物FeO的应变速率和该氧化膜的横向生长比较高,高温氧化膜开裂后,裂纹不能自愈,较低温度时合金表面发生了线性氧化。
The formation cause of yellow rusty stain on the surface of the SPA-H steel sheet in the continuous casting and continuous rolling process at elevated temperature was studied with optical microscopy, scanning electronic microscopy,energy spectrum and X-ray diffraction.The results show that the yellow rusty stain is distributed as belts on the steel sheet surface.The out-layer of the stain is composed of Fe2O3.while the inner-layer is mainly composed of FeO,The yellow rusty stain is mainly caused by the cracks of FeO on the steel surface in rolling and Fe2O3 formation in the cracks.The strain-rate of FeO and its transversal growth rate are relative high and can＇t be self-healed,consequently the surface of the steel will be occur linear oxidation at lower temperature.
出处
《金属热处理》
EI
CAS
CSCD
北大核心
2006年第1期62-65,共4页
Heat Treatment of Metals
关键词
SPA-H耐候钢
连铸连轧工艺
表面锈斑
SPA-H weather steel
continuous casting and continuous rolling process
surface rusty stain
