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一、前言目前武钢生产的低碳钢以及低合金热轧板,经“米巴赫”(Miebach)焊机闪光焊拼卷后酸洗,最后经五机架连轧机进行冷轧,在连续轧制过程中,时常出现断带现象。产生断裂的部位包括基材和焊缝,尤其是焊缝部位的裂缝占很大比例。为了解决这个问题,我们着重对焊缝部位的断裂现象进行了研究。二、试验材料 1.试验材料试验钢种为AY1、AY2、A1F、B1F、08F、W08F、08AL、A1和AD2等。试验用料取自生产线上发生断裂的冷轧板、闪光焊接及酸洗后的热轧板。 2.试样制备 2.1将在现场取到的大块冷轧断带制成金相试样,并在邻近部位截取断口试样。 2.2将酸洗热轧板制成拉力、反复弯曲、
I. Introduction At present, low-carbon and low-alloy hot-rolled plates produced by Wuhan Iron and Steel Co., Ltd. are smoked and spun on the Miebach welder, pickled and then cold-rolled through a five-stand continuous rolling mill. During the process, broken tape often appears. Fracture sites include the base material and the weld, in particular, a large proportion of cracks in the weld area. In order to solve this problem, we focused on the fracture phenomenon of the weld site. Second, the test material 1 test material test steel grade AY1, AY2, A1F, B1F, 08F, W08F, 08AL, A1 and AD2 and so on. Test materials taken from the production line fracture of the cold-rolled plate, flash welding and pickling hot-rolled plate. 2. Sample Preparation 2.1 Large cold-rolled broken belt taken in the field made of metallographic specimens, and in the vicinity of the interception of fracture specimens. 2.2 The pickling hot-rolled plate made of tension, repeated bending,