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作者应用径迹显微照相技术(PTA)研究了硼在奥氏体晶界的非平衡偏聚。实验结果表明,含硼10ppm的Fe-30wt%Ni奥氏体合金,在1050℃以上,不产生硼的平衡晶界偏聚和硼化物析出;但当该合金试样从1050℃以上温度水冷和空冷时,产生硼的非平衡晶界偏聚。这种偏聚是在试样的冷却过程中产生的,其特点是,在一定的冷却速度下,冷却开始温度越高,偏聚量越大;而在一定的冷却开始温度下,试样的冷却速度越小,偏聚量越大。
The authors studied the non-equilibrium segregation of boron in the austenite grain boundaries using track photomicrography (PTA). The experimental results show that the boron-containing 10wt% Fe-30wt% Ni austenitic alloy does not produce equilibrium boron boundary segregation and boride precipitation at temperatures above 1050 ℃. However, when the alloy specimen is cooled from above 1050 ℃ Air-cooled, resulting in boron non-equilibrium grain boundary segregation. This segregation is generated during the cooling of the sample, which is characterized by a certain cooling rate, the higher the cooling start temperature, the greater the amount of segregation; and at a certain cooling start temperature, the sample of the The smaller the cooling rate, the greater the amount of segregation.