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应用透射电镜(TEM)和X射线能谱(EDX)对CSP工艺含钛耐候钢中的细小磷化物进行了研究.对成品钢板和经900℃压缩20%并等温30min的连铸坯分析结果表明:耐候钢中存在MxP型纳米级磷化物,x值为2～3,金属元素M为Fe、Ti及少量Cr或Ni,磷化物的结构为六方晶系,点阵常数a=0.609nm、c=0.351nm;成品钢板中磷化物尺寸多在20nm以下,而经过900℃压缩的连铸坯试样中磷化物的尺寸、形状不尽相同,较大的棒状磷化物长约300nm、宽约50nm,其他粒子在50nm以下,多呈方形.CSP工艺生产线中可能发生磷化物沉淀的阶段是热连轧的最后两个道次直至冷却到400～500℃的过程中;磷化物的析出可提高沉淀强化效果,但同时会使钢中的固溶磷浓度降低.
The results of TEM and X-ray diffraction (EDX) showed that the small phosphides in CSP titanium-containing weathering steels were studied.The results of the analysis of the finished steel slabs and the slab compressed at 20 ℃ and 900 ℃ for 30 min : Weathering steel exists MxP-type nano-phosphide, x value of 2 to 3, the metal element M is Fe, Ti and a small amount of Cr or Ni, phosphide structure hexagonal system, lattice constant a = 0.609nm, c = 0.351nm; the size of the phosphides in the finished steel plate is more than 20nm, while the size and shape of the phosphides in the slab sample after compression at 900 ℃ are not the same. The larger rod-shaped phosphide has a length of about 300nm and a width of about 50nm , The other particles below 50nm, mostly square.CSP process production line may occur phosphide precipitation stage is the last two hot continuous rolling until cooled to 400 ~ 500 ℃; precipitation of phosphine can increase the precipitation Strengthen the effect, but at the same time will reduce the concentration of dissolved phosphorus in steel.