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本文中用拉伸试验、光学显微镜和电子显微镜研究了有序Fe-Si合金的形变行为和克服含硅6.5％硅钢脆性的途径,并对合金强化机制进行了讨论。实验表明,原子有序,特别是DO_3有序是含6.5％Si的Fe-Si合金高脆性原因。有序合金超位错滑移升高屈服强度和加工硬化。位错平面滑移,过早产生塞集和晶界上滑移灵便性差导致热轧后具有高的脆性。温轧和回复可以在相当程度上改善脆性。本文提出,温轧和在高温无序区短时加热淬火,有效地改善了含硅6.5％硅钢的脆性。
In this paper, tensile test, optical microscope and electron microscope were used to study the deformation behavior of ordered Fe-Si alloy and the way to overcome the brittleness of 6.5% silicon steel containing silicon. The strengthening mechanism was also discussed. Experiments show that the atomic order, especially the DO_3 ordering is the reason of the high brittleness of the Fe-Si alloy containing 6.5% Si. Order super alloy dislocation slippage increased yield strength and work hardening. Dislocation plane slip, premature plugging and slippery slip on the grain boundaries lead to high brittleness after hot rolling. Warm rolling and recovery can improve brittleness to a considerable extent. In this paper, the brittleness of 6.5% silicon steel containing silicon is effectively improved by warm-rolling and short-time heating quenching in the high-temperature disorder zone.