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对一种 C-Mn 钢和三种微合金钢的冷轧和退火钢带,在755℃双相处理后,虽能得到双相钢良好的强度,塑性和加工硬化特征的综合性能,但是一般要降低 R 值。在730℃双相处理提高了(?),但降低塑性。可以认为,少量马氏体的生成,尽管消耗了对深拉取向不利的铁素体,但是马氏体含碳量较高使塑性降低。大量含碳量低的马氏体的生成,也消耗了取向有利的铁素体,因此降低(?),但把塑性恢复到双相钢应有的水平。一种简单复合材料拉伸变形的计算机模拟表明,为了解决有代表性的双相钢的塑性,硬相也需要有一定的塑性变形。
For a C-Mn steel and three kinds of microalloyed steel cold-rolled and annealed strip, after the dual phase treatment at 755 ℃, although the dual-phase steel can get a good overall strength, plasticity and work hardening characteristics, but generally To reduce the R value. Biphasic treatment at 730 ° C increased (?) But decreased ductility. It is believed that the formation of a small amount of martensite reduces the ductility due to the higher carbon content of martensite despite the consumption of ferrite which is unfavorable for deep drawing. The formation of a large amount of martensite with a low carbon content also consumes ferrite oriented favorably, thereby decreasing (?) But recovering the ductility to the level that dual-phase steel should have. A simple computer simulation of the tensile deformation of the composite shows that in order to solve the ductility of a typical dual phase steel, the hard phase also needs some plastic deformation.