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为研究Si含量对双相钢可镀性的影响,对3种不同Si含量的双相钢进行了连续退火镀锌模拟实验。采用SEM和XPS分析表面氧化物和抑制层形貌,结果表明:Si含量的变化对表面氧化物的形貌有较大影响。Si含量从0.04%增加到0.1%,双相钢退火后在晶界处出现Si氧化物的偏析。XPS和EDS证实其为Mn2SiO4。晶内出现的氧化物为MnO和Cr2O3。Si含量增加到0.4%时,Si氧化物在晶界的偏析更加严重,晶界还出现了SiO x。Fe-Al抑制层在Si含量0.04%和0.1%时完整而致密,而Si含量为0.4%时出现了缺陷,这是由于SiO x难以被有效Al还原造成的。
In order to study the effect of Si content on the ductility of duplex steel, three types of dual phase steels with different Si contents were simulated by continuous annealing. The surface oxides and the inhibition layer morphology were analyzed by SEM and XPS. The results show that the change of Si content has a great influence on the morphology of the surface oxides. The content of Si increased from 0.04% to 0.1%, and the segregation of Si oxide appeared at the grain boundary after the dual phase steel was annealed. XPS and EDS confirmed that it was Mn2SiO4. Oxides present in the grain are MnO and Cr2O3. Si content increased to 0.4%, Si oxide segregation in the grain boundary more serious, but also the grain boundary SiOx. The Fe-Al suppression layer was intact and dense at Si contents of 0.04% and 0.1%, whereas defects occurred at a Si content of 0.4% because of the difficulty of SiOx reduction by effective Al reduction.