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对含钒钢生产和使用方面的一系列问题进行了研究。钒钢在连铸过程中较高的高温延性,使之具有较低的横裂敏感性,因而使潜在生产能力大大提高。不仅如此,浇铸过程中的冷却还可以导致颗粒析出,它们的分布有利于Ti-V-N钢的生产。轧制过程中,钒钢易于在较宽的温度范围进行再结晶,因而比其他微合金钢产生的轧制负荷低,特别是在温度降低之后。此外,再结晶的奥氏体晶粒大小在很宽的终轧温度范围保持稳定,因而性能相对来说不受影响,并且,此晶粒尺寸可以通过控制添加Ti和N进行细化。不仅如此,如果在两相区进行低温轧制,钒钢可以产生含有高位错密度和析出颗粒的显微组织,从而达到强度与韧性的良好配合。因而,通过适当的工艺(包括热轧、控轧、加速冷却和两相轧制)进行加工,可以得到一个性能范围宽且可以控制的钢种系列。本文对这些钢的性能进行了研究。钒钢在一定的热量输入范围是可以焊接的,并且有特殊优势,即由于使用了钒,特别是在热影响区冷却速率较慢的情况下,可以生成有利的热影响区组织。文章在钒对热影响区韧性的影响方面进行了论述。
A series of questions on the production and use of vanadium-containing steels have been studied. Vanadium steel in the casting process of high high temperature ductility, so that it has a lower sensitivity to transverse cracking, thus greatly increasing the potential production capacity. Not only that, cooling during casting can also lead to particle precipitation, their distribution favors Ti-V-N steel production. During the rolling process, vanadium steels tend to recrystallize over a wide temperature range and therefore have a lower rolling load than other microalloyed steels, especially after the temperature has dropped. In addition, the recrystallized austenite grain size remains stable over a wide range of finish rolling temperatures, so performance is relatively unaffected, and the grain size can be refined by the control of Ti and N additions. Moreover, vanadium steel can produce microstructures containing high dislocation density and precipitated particles if low-temperature rolling is carried out in the two-phase region so as to achieve a good combination of strength and toughness. As a result, a wide range of performance and controllable steels are available through the proper machining, including hot rolling, controlled rolling, accelerated cooling and two-phase rolling. In this paper, the performance of these steels has been studied. Vanadium steel is weldable over a range of heat input and has the special advantage that due to the use of vanadium, a particularly favorable HAZ texture can be produced, especially in the case of slow cooling rates in the HAZ. The article discusses the impact of vanadium on the toughness of the HAZ.