2101双相不锈钢表面缺陷机理分析

Surface Defect Mechanism Analysis of 2101 Duplex Stainless Steel

研究加热温度和时间对双相不锈钢表面缺陷的影响,结果表明在1 245℃加热的条件下,随着加热时间的延长内氧化程度加剧,加热过程中氧与表面的锰发生氧化反应,在动力学的作用下氧化的锰和硅原子从基体内向表面扩散。在氧含量较低的情况下,优先形成硅锰的氧化物并发生选择性氧化,并沿着锰和硅原子扩散形成的通道向基体内部扩散发生内氧化,导致钢板表面氧化均匀性变差,在经轧机轧后内氧化部位在压应力的作用下发生微裂纹,产生起皮、裂纹等缺陷。

The effect of heating temperature and time on the surface defects of duplex stainless steel was studied. The results showed that the oxidation of oxygen and manganese occurred during heating at 1 245 ℃, dynamically oxidized manganese and silicon atoms are diffused from the substrate to the surface. Under the condition of low oxygen content, silicon-manganese oxides are preferentially formed and selectively oxidized, and internal oxidation occurs along the diffusion channel formed by the diffusion of manganese and silicon atoms into the matrix, which leads to the poor oxidation uniformity on the surface of the steel plate, after rolling, micro-cracks, such as peeling and cracking, occur at the internal oxidation position under the action of compressive stress.