Experimental investigation on segregation and remelting behaviors of boron-containing steel with low carbon
Experimental investigation on segregation and remelting behaviors of boron-containing steel with low carbon
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低碳含硼钢偏析及重熔行为实验研究
DOI：
10.1016/j.rinp.2018.11.059
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发表时间：
2019-03
影响因子：
5.3
通讯作者：
Lei Jialiu
中科院分区：
文献类型：
--
作者：
Zhu Hangyu;Sun Jian;Wang Wei;Wang Weisheng;Lei Jialiu
硼在低碳钢中能显著改善钢的淬透性和热塑性。然而，由于含硼钢的偏析和重熔行为，在连铸过程中经常出现裂纹、中间裂纹甚至漏钢等缺陷。利用光学显微镜观察了裂纹周围的形貌特征。利用二次离子质谱（西姆斯）和高温共聚焦激光扫描显微镜（CLSM）分别观察了硼在晶界处的偏聚和分布，以及裂纹周围的重熔现象。结果表明，裂纹区存在BN颗粒，硼在晶界处富集。由于硼的偏析，冷却过程中在1420-1400 °C和1340-1330 °C下观察到液相，硼含量甚至为0.0013wt%。根据硼的偏聚和重熔行为，揭示了低温和高温脆性区。
Boron in low carbon steel can improve hardenability and hot ductility remarkably. However, defects including cracks, internal half way cracks, and even breakouts commonly appear during the continuous casting process, due to the segregation and remelting behaviors of boron-containing steel. In the present investigation, morphology characteristics around the crack were observed by optical microscope (OM). The segregation and distribution of boron around grain boundary were observed by secondary ion mass spectroscopy (SIMS), and the remelting phenomenon around the crack was observed by the high temperature confocal laser scanning microscope (CLSM). Results show that BN particles are detected in the crack region, Boron is concentrated at grain boundaries. Due to the boron segregation, liquid phase is observed at 1420–1400 °C and 1340–1330 °C in cooling process with boron content even of 0.0013 wt%. The low and high temperature brittle zones are revealed based on boron segregation and remelting behavior.
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影响因子：
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