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为了研究硅钢热轧板脆性随温度的变化,测定了不同温度下材料的冲击韧性值,得出3% Si-Fe的热轧板,存在一脆性转变温区,其上、下限温度分别约为+100°和0℃。在此范围内,冲击韧性对温度的变化极为敏感,变化量可达一个数量级以上;在此温区外,冲击韧性几乎不因温度而变化.可以解释为:3%Si-Fe的热轧板,在脆性转变温区的上限内处于塑性状态;低于下限温度时则处于脆性状态。因此,冷轧前将板卷预热到60—80℃是避免断裂的有效措施,此时,它处于塑性状态,也不致产生损坏最终磁性的时效现象。观察3%Si-Fe热轧板断口看出:脆性断口上占绝对优势的是沿{100}面的解理断裂,介于各解理面系间较窄的过渡区的晶面多属{110},在解理面上往往可以发现(110)滑移面露头的痕迹,解理的主要走向与这些滑移痕迹几乎平行,解理面上较大的解理台阶的面多属{110}:塑性断裂时,断口上存在大量区别于{110}面系的高指数面,即使在塑性断裂时也存在少量沿{100}的解理断裂。
In order to study the brittleness of the hot-rolled silicon steel with temperature changes, the impact toughness of the material at different temperatures were measured to obtain a 3% Si-Fe hot-rolled plate, there is a brittle transition temperature zone, the upper and lower temperature were about + 100 ° and 0 ° C. Within this range, impact toughness is extremely sensitive to temperature changes by more than an order of magnitude; impact toughness is almost invariant to temperature outside of this temperature range, which can be explained as: 3% hot-rolled sheet of Si-Fe , In the upper limit of the brittle transition temperature in a plastic state; below the minimum temperature is in a brittle state. Therefore, pre-heating the coil to 60-80 ° C prior to cold rolling is an effective measure to avoid breakage, in which case it is in a plastic state and does not cause aging which damages the final magnetism. The observation of 3% Si-Fe hot-rolled plate shows that the brittle fracture is dominated by the cleavage fracture along the {100} plane. The cleavage planes between the cleavage planes of the cleavage planes are mostly { 110}. On the cleavage plane, traces of outcrop of (110) slip surface can often be found. The main cleavage directions are nearly parallel to these slip traces. The cleavage steps on the cleavage plane are mostly { 110}: There are a large number of high-index planes on the fracture that are different from the {110} plane on plastic fracture. There are a few cleavage fractures along {100} even in the plastic fracture.