Effect of Controlled Rolling and Cooling Process on Microstructures and Mechanical Properties of Low Carbon Bainitic Steel AH80DBD

doi:10.20057/j.1003-8620.2022-00050

Abstract

Abstract: The effect of microstructure on impact properties of AH80DBD low carbon bainite steel is analyzed by macro-fractography, scanning fractography, metallography and transmission electron microscope. The experimental results show that by cooling rate 22℃/s after rolling, the microstructure with better impact toughness (-20℃ Axy 204-235J) is granular bainite+Lath Bainite+fine M-A. With distance between lath 200-400nm, by cooling rate 12 ℃/s after rolling, the distance between lath is~800nm, and the-20 ℃ A_kv of steel is only 41-57J. Therefore, the cooling rate of AH8ODB is greater than 20 ℃/s during production.

Key words: AH80DBD Low Carbon Bainitic Steel, Cooling Rate After Rolling, Impact Energy, Microstructures Performance

摘要： 通过宏观断口、扫描断口、金相组织、透射电镜等方法分析了AH80DBD低碳贝氏体钢的组织结构对冲击性能的影响。试验结果表明：该钢轧后冷速22℃/s时，冲击韧性较好(-20℃AKV 204～235 J),其组织为粒状贝氏体+板条贝氏体+细小的M-A,板条间距200～400 nm,而轧后冷速12℃/s时，板条间距～800 nm, -20℃A_kv 41～57 J,因此，AH80DBD钢在生产过程中冷却速率应≥20℃/s。

关键词: AH80DBD低碳贝氏体钢, 轧后冷速, 冲击功, 组织性能

Chen Yinze, Li Na, Song Liwei, Ma Zhiqiang. Effect of Controlled Rolling and Cooling Process on Microstructures and Mechanical Properties of Low Carbon Bainitic Steel AH80DBD[J]. Special Steel, 2023, 44(1): 97-100.

陈尹泽, 李娜, 宋立伟, 马志强. 控轧控冷工艺对低碳贝氏体高强钢AH80DBD组织和力学性能的影响[J]. 特殊钢, 2023, 44(1): 97-100.

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Effect of Controlled Rolling and Cooling Process on Microstructures and Mechanical Properties of Low Carbon Bainitic Steel AH80DBD

控轧控冷工艺对低碳贝氏体高强钢AH80DBD组织和力学性能的影响

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