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Ordered phases and microhardness of Fe-6.5%Si steel sheet after hot rolling and annealing

机译：Fe-6.5％Si钢板热轧和退火后的有序相和显微硬度

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摘要

Fe-6.5%Si steel was hot rolled and heat treated in the laboratory. The grain interplanar spacing and microhardness of the steel were measured, and the ratio of diffraction peaks intensity of the A2 disordered phase and the DO_3 ordered phase was analyzed under different cooling conditions. With the increasing of cooling rate, indentation morphology of Vickers microhardness for the experimental steel was transformed from a sink-in type into a pile-up type, and the strain-hardening exponent decreased. As annealing temperature was decreased below 700 ℃, DO_3 and B2 ordered phases are formed, resulting in a higher microhardness. When annealing temperature was greater than 800 ℃, ordered phase is transformed from B2 to DO_3, microhardness of the steel decreased. Indentation morphologies of Vickers microhardness become a sink-in type when annealing temperature was lower than 650 ℃. While annealing temperature was 700-900 ℃, the surface indentation morphologies of samples was a pile-up type. With the increase of annealing temperature, the amount of DO_3 ordered phases and the strain-hardening exponent decreased. The ordered phases in Fe-6.5%Si steel could cause the difficulty of dislocation movement and brittleness at room temperature during plastic deformation.
机译：在实验室中对Fe-6.5％Si钢进行热轧和热处理。测量了钢的晶面间距和显微硬度，并分析了在不同冷却条件下A2无序相和DO_3有序相的衍射峰强度比。随着冷却速率的提高，实验钢的维氏显微硬度压痕形态从沉入型转变为堆积型，应变硬化指数降低。当退火温度降低到700℃以下时，形成DO_3和B2有序相，导致较高的显微硬度。当退火温度大于800℃时，有序相从B2转变为DO_3，钢的显微硬度降低。当退火温度低于650℃时，维氏显微硬度的压痕形态变为沉陷型。当退火温度为700-900℃时，样品的表面压痕形态为堆积型。随着退火温度的升高，DO_3有序相的数量和应变硬化指数减小。 Fe-6.5％Si钢中的有序相可能会导致塑性变形过程中室温下位错运动和脆性变得困难。

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