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热轧态Q235钢经历加热奥氏体化、淬火马氏体相变、大塑性变形轧制、轧后退火等工艺处理,材料组织由最初的铁素体+珠光体转变为细化的板条马氏体,断口形貌也随之发生了显著变化。初始热轧态试样断口呈典型的韧窝状形貌,然而轧后马氏体试样的断口形貌主要为分层状特征。虽然轧后退火试样断口形貌与冷轧态的样品相似,但断口中出现数量众多的小韧窝。在该制备工艺下,材料不仅获得了16%的伸长率,表现出良好的塑性,而且抗拉强度高达1300 MPa。
Hot rolled Q235 steel undergoes the processes of heated austenitizing, quenched martensitic transformation, major plastic deformation and rolling, post-rolling annealing and the like, and the material structure changes from the initial ferrite + pearlite to refined slat Martensite, fracture morphology also followed a significant change. The fracture surface of the initial hot-rolled specimen showed a typical dimple morphology, however, the fracture morphology of the martensite specimen after rolling was mainly layered. Although the fracture morphology of annealed samples after rolling is similar to that of the cold rolled samples, a large number of small dimples appear in the fracture. Under this preparation process, the material not only achieves an elongation of 16%, exhibits good ductility, but also has a tensile strength as high as 1300 MPa.