Segregation of Boron in Ultra Low Carbon Microalloyed Steels Containing Copper during Continuous Cooling
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摘要: 用硼径迹显微照相技术研究含铜超低碳微合金钢从1 150℃以5℃/s冷却到850℃过程中硼的晶界偏聚的形成与发展的过程。统计分析了冷却到不同温度时富集因子与贫化区宽度的变化,研究表明在冷却初始阶段硼-空位复合体迅速扩散到晶界上,使晶界上的硼迅速增加,在1 090℃达到极大值,冷却到1 090~940℃区间时,随着温度的降低晶界上的硼发生明显的反向扩散,晶界上的硼逐渐减少,继续降低温度,随着析出物的出现反向扩散变弱,晶界上硼的偏聚量又开始增加。Abstract: By means of particle tracking autoradiography(PTA),the segregation of boron to grain boundaries in ultra low carbon microalloyed steels during cooling from 1 150℃ to 850℃ at 5℃/s was investigated.The enrichment factors and widths of boron depletion zone were measured at different temperatures,and the effect of copper on the segregation of boron was analyzed.It is found that the concentration of boron on the grain boundary increases in the beginning cooling stage and reaches its maximum at about 1 090℃;after that,it decreases gradually to a minimum with temperatures decreasing to 940℃;and then,it increases again.
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Key words:
- ultra low carbon microalloyed steels /
- copper /
- boron /
- grain boundary segregation
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