2205双相不锈钢表面起皮缺陷研究

Study on Surface Peeling Defect of 2205 Duplex Stainless Steel

通过扫描电镜和能谱分析对2205双相不锈钢表面起皮缺陷进行了研究。对比了304、410S和2205钢高温变形抗力。结果表明,起皮缺陷中Fe、Cr、O的含量较高,为典型的次生氧化皮成分;低应变速率下,两相塑性差异较小,随着应变速率的增加,奥氏体和铁素体塑性差异增大。在高应变速率下,奥氏体和铁素体塑性变形不协调导致形成微裂纹,轧制时被拉长,酸洗后形成起皮缺陷。

The surface peeling defects of 2205 duplex stainless steel were investigated by SEM and EDS. The deformation resistances of 304, 410S and 2205 steel at high temperature we, re contrasted. The results show that the contents of Fe, Cr and O in peeling defect are higher, which is a typical secondary oxide composition. The differences of two phase plasticity are small at low strain rate. With the increasing strain rate, plasticity differences of austenite and fetrite increase. Uncoordinated austenite and ferdte plastic deformation leads to formation of micro-cracks at high strain rate, which is elongated during rolling and forms peeling defect after picking.