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目前双相不锈钢2205的主要质量异议愈来愈多地集中于表面缺陷问题。利用体视显微镜、光学显微镜、扫描电镜以及能谱分析等手段,对双相不锈钢2205热轧板表面的起皮缺陷进行了截面形貌、能谱及组织结构的金相分析。结果表明,钢板表面上的起皮缺陷呈波浪状分布,一端与基体连接,一端开裂在钢板表面;缺陷处存在点、链状的Al_2O_3颗粒和CaO-SiO_2-Al_2O_3-MgO系复合夹杂物,且奥氏体相的体积分数明显偏高(58.5%)。这可以引起该位置材料塑性的降低,即在材料中出现低塑性区,这正是起皮缺陷出现在该区域的主要原因。基于这样的分析,建立了描述起皮缺陷形成过程的唯象模型。
At present, the main quality objections of duplex stainless steel 2205 are more and more concentrated on the issue of surface defects. The morphology, energy spectrum and microstructure of the as-cut surface of 2205 hot-rolled duplex stainless steel were investigated by stereomicroscope, optical microscope, scanning electron microscope and energy spectrum analysis. The results show that the peeling defects on the surface of the steel plate are wavy, one end of which is connected to the substrate and the other end is cracked on the surface of the steel plate. There are point-chain Al 2 O 3 particles and CaO-SiO 2 -Al 2 O 3 -MgO composite inclusions in the defects The volume fraction of austenite phase is significantly higher (58.5%). This can lead to a reduction in the plasticity of the material at this location, ie, the presence of a low plastic zone in the material, which is the primary cause of skinning defects in this area. Based on this analysis, a phenomenological model describing the formation process of skin defects has been established.