硼的添加对热轧和回火后低碳贝氏体钢显微组织和力学性能的影响

doi:10.11890/1006-7191-116-473

Acta Metallurgica Sinica (English Letters) ›› 2011, Vol. 24 ›› Issue (6): 473-486.DOI: 10.11890/1006-7191-116-473

硼的添加对热轧和回火后低碳贝氏体钢显微组织和力学性能的影响

兰亮云¹,邱春林¹,赵德文²,²

1. 东北大学轧制技术及连轧自动化国家重点实验室
2.

收稿日期:2011-02-25 修回日期:2011-03-27 出版日期:2011-12-25 发布日期:2011-12-22
通讯作者: 兰亮云

Effect of boron addition on the microstructures and mechanical properties of thermomechanically processed and tempered low carbon bainitic steels

Liangyun LAN¹, Chunlin QIU¹, Ping ZHOU^1,2, Dewen ZHAO¹,Canming LI^1,2, Xiuhua GAO¹, Linxiu DU¹

1. The State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China
2. Technical Research and Development Center, Laiwu Steel Group,Laiwu 271104, China

Received:2011-02-25 Revised:2011-03-27 Online:2011-12-25 Published:2011-12-22
Contact: Liangyun LAN

摘要/Abstract

Abstract: Thermomechanical process and tempering heat treatment were employed to produce the experimental steel plates. The effect of boron addition on the microstructure and mechanical properties of low carbon bainitic steels was studied in this paper. Microstructure observation and crystallographic features were conducted by using optical microscopy, SEM, TEM and electron back scattering diffraction (EBSD) analysis. The results showed that under the same rolling processes and heat treatment conditions, a substantial increase in strength is obtained by addition of boron into steel, but accompanied by an obvious drop in toughness. New martensite phase forms along the grain boundaries on tempering at 650 ℃ mainly due to boron segregation, which can further deteriorate impact toughness of the boron bearing steel. The EBSD analysis showed that high angle grain boundary is not responsible for the deteriorated toughness of the boron bearing steel because it has relatively higher percentage of high angle grain boundary than the boron free steel. The low toughness of the boron bearing steel is mainly attributed to the coarse boride precipitated particles according to the results of fractograph observation.

Key words: Low carbon bainitic steel, Boron, Tempering, Microstructure, Brittle fracture

兰亮云邱春林赵德文. 硼的添加对热轧和回火后低碳贝氏体钢显微组织和力学性能的影响[J]. Acta Metallurgica Sinica (English Letters), 2011, 24(6): 473-486.

Liangyun LAN, Chunlin QIU, Ping ZHOU, Dewen ZHAO,Canming LI, Xiuhua GAO, Linxiu DU. Effect of boron addition on the microstructures and mechanical properties of thermomechanically processed and tempered low carbon bainitic steels[J]. Acta Metallurgica Sinica (English Letters), 2011, 24(6): 473-486.

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硼的添加对热轧和回火后低碳贝氏体钢显微组织和力学性能的影响

Effect of boron addition on the microstructures and mechanical properties of thermomechanically processed and tempered low carbon bainitic steels

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