新型槽帮钢的连续冷却转变曲线及微观组织

doi:10.13251/j.issn.0254-6051.2023.06.034

摘要/Abstract

摘要： 采用膨胀仪、光学显微镜和维氏硬度计研究新型槽帮钢的连续冷却转变行为, 获得连续冷却转变(CCT)曲线。结果表明, CCT曲线存在高温铁素体-珠光体转变区、中温贝氏体转变区和低温马氏体转变区。随着冷却速度的增大, 室温硬度不断提高, 微观组织由铁素体-珠光体向贝氏体和马氏体过渡, 最终形成单一马氏体组织。在实测冷却曲线中, 当冷却速度小于0.14 ℃/s时, 组织主要为高温铁素体-珠光体转变区;当冷却速度为0.14~0.81 ℃/s时主要为高温、中温复合转变区, 室温组织主要为铁素体、珠光体和贝氏体;当冷却速度为0.81~1.62 ℃/s时为高温、中温和低温复合转变区, 室温组织为铁素体、珠光体、贝氏体和马氏体;当冷却速度为4.05 ℃/s时为中温、低温两相转变区, 高温转变区消失, 室温组织为贝氏体和马氏体;当冷却速度高于8.10 ℃/s时, 为马氏体单相转变区。随着冷却速度由0.06 ℃/s提高到40.5 ℃/s, 微观组织由铁素体-珠光体过渡为贝氏体-马氏体, 直至单相马氏体组织, 其室温显微硬度由195 HV5(冷速为0.06 ℃/s)增大到515 HV5(冷速为40.5 ℃/s)。

关键词: 槽帮钢, 连续冷却转变, 微观组织, 显微硬度, CCT曲线

Abstract: Continuous cooling transformation behavior of a new-type slot edge steel was studied by thermal dilatometer, optical microscope and Vickers hardness tester, and the continuous cooling transformation (CCT) curves were obtained. The results show that the CCT curve diagram includes high temperature ferrite-pearlite transition zone, middle temperature bainite transition zone and low temperature martensite transition zone. When the cooling rate is less than 0.14 ℃/s, it is mainly the high temperature ferrite-pearlite transition zone. When the cooling rate is 0.14-0.81 ℃/s, the room temperature microstructure is mainly composed of ferrite, pearlite and bainite. When the cooling rate is 0.81-1.62 ℃/s, the room temperature microstructure is composed of ferrite, pearlite, bainite and martensite. When the cooling rate is 4.05 ℃/s, the high temperature transformation zone disappears, and the room temperature microstructure is bainite and martensite. When the cooling rate is higher than 8.10 ℃/s, it is a single-phase transformation zone of martensite. With the cooling rate increasing from 0.06 ℃/s to 40.5 ℃/s, the microstructure changes from ferrite+pearlite to bainite +martensite, and finally to single-phase martensite, and the room temperature microhardness increases from 195 HV5 (0.06 ℃/s) to 515 HV5 (40.5 ℃/s).

Key words: slot edge steel, continuous cooling transformation, microstructure, microhardness, CCT curves

中图分类号:

徐海峰, 李海, 李凤敏, 付胜敏, 明科宇, 郁言. 新型槽帮钢的连续冷却转变曲线及微观组织[J]. 金属热处理, 2023, 48(6): 191-196.

Xu Haifeng, Li Hai, Li Fengmin, Fu Shengmin, Ming Keyu, Yu Yan. Continuous cooling transformation curves and microstructure of new-type slot edge steel[J]. Heat Treatment of Metals, 2023, 48(6): 191-196.

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