论文部分内容阅读
对双辊薄带连铸(TRC)工艺条件下低碳钢铸带坯、热轧板的显微组织及力学性能进行研究,并与传统生产工艺(TP)的冷轧板产品进行了对比。铸带坯主要由200~300μm的不规则的多边形铁素体组成,并伴随着少量20μm左右的多边形铁素体。经一道次热轧后,厚度方向上组织严重不均:上下表层为细晶区,平均晶粒尺寸为10μm左右;中部为粗晶区,平均晶粒尺寸为40μm左右。粗晶区宽度约占整个板厚的50%。传统生产工艺的冷轧退火板的组织则较为均匀,平均晶粒尺寸约为15μm。薄带连铸热轧板与传统冷轧退火板相比具有较强的α织构和较弱的γ织构。薄带连铸热轧板的屈服强度、抗拉强度与传统工艺的冷轧退火板相当。但是,两者的拉伸曲线显著不同,前者表现为连续屈服,后者出现了屈服平台。
The microstructure and mechanical properties of the low carbon steel billet and hot rolled strip under two-roll strip casting (TRC) process were studied and compared with those of traditional cold rolled sheet (TP). The cast billet consists mainly of irregular polygonal ferrite of 200-300 μm with a small amount of polygonal ferrite of about 20 μm. After a series of hot rolling, the thickness direction of the serious uneven distribution: the upper and lower surface layer of fine grain, the average grain size of about 10μm; the middle of the coarse grain region, the average grain size of about 40μm. Coarse grain area width of about 50% of the entire thickness. The traditional production process of cold-rolled annealed board is more uniform, with an average grain size of about 15μm. Compared with the traditional cold-rolled annealed sheets, the strip-cast hot-rolled sheet has a stronger α texture and a weaker γ texture. The yield strength and tensile strength of the strip continuous casting hot-rolled sheet are comparable to those of the conventional cold-rolled annealed sheet. However, the tensile curves of the two are significantly different. The former shows continuous yielding and the latter yields the yielding platform.