1.湖南华菱湘潭钢铁有限公司技术中心 湘潭 411101
2.安徽工业大学 马鞍山 243002
潘锡泉(1986—),男,本科,工程师;E-mail: 101373@mail.hnxg.com.cn
郑成思(1986—),男,博士,副教授;E-mail: zhengchengsi@ahut.edu.cn
收稿:2024-12-30,
修回:2025-02-17,
录用:2025-02-21,
纸质出版:2025-09-30
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潘锡泉,陈立,李为龙等.锑微合金化HRB500低温钢动态CCT曲线及显微组织[J].特殊钢,2025,46(05):104-109.
Pan Xiquan,Chen Li,Li Weilong,et al.Dynamic CCT Curve and Microstructures of Antimony Micro-alloyed HRB500 Low-temperature Steel[J].Special Steel,2025,46(05):104-109.
潘锡泉,陈立,李为龙等.锑微合金化HRB500低温钢动态CCT曲线及显微组织[J].特殊钢,2025,46(05):104-109. DOI: 10.20057/j.1003-8620.2024-00290.
Pan Xiquan,Chen Li,Li Weilong,et al.Dynamic CCT Curve and Microstructures of Antimony Micro-alloyed HRB500 Low-temperature Steel[J].Special Steel,2025,46(05):104-109. DOI: 10.20057/j.1003-8620.2024-00290.
为了揭示锑微合金化铁素体低温钢在连续冷却相变过程中显微组织和硬度的变化及原因,采用Gleeble 3800热模拟试验机测定了实验钢的动态连续冷却转变曲线(动态CCT曲线),通过光学显微镜对不同冷速下实验钢的微观组织结构进行表征,并采用显微硬度仪测试其维氏硬度。结果表明,当冷速保持在0.1 ℃/s时,实验钢的微观组织由多边形铁素体与珠光体构成;当冷速处于0.3~1 ℃/s内,微观组织表现为多边形铁素体、珠光体以及粒状贝氏体;当冷速提升至3~40 ℃/s,微观组织表现为多边形铁素体与板条状贝氏体。由于细晶强化和粒状贝氏体强化,当冷速为0.1~1 ℃/ s时,硬度上升较快,从172.1HV增大至207.7HV;由于组织细化和板条状贝氏体比例增大,冷速为3~40 ℃/s时,硬度随着冷速增大而从214.9HV线性增大至261.8HV。锑微合金化铁素体低温钢合适的控冷区间为3~40 ℃/ s。
In order to reveal the change and reason of microstructure and hardness of antimony micro-alloyed ferrite cryogenic steel during continuous cooling transformation, hot compression tests were conducted on a Gleeble 3800 thermal simulator and the dynamic continuous cooling transformation (CCT) curves of the experiment steel were determined based on the experiments. The microstructure and the Vickers hardness at different cooling rates was characterized by optical microscope and microhardness tester, respectively.The results show that when the cooling speed remains at 0.1 ℃ / s, the microscopic organization of experimental steel is composed of polygonal ferrite and beads; when the cooling speed is within 0.3 ℃-1 ℃ / s, the microstructure appears as polygonal ferrite, pearlosite and granular bainite; When the cooling speed is increased to 3 ℃/ s,-40 ℃/ s, the microstructure appears as polygonal ferrite and plated bainite. Due to fine grain and granular bainite strengthening, the hardness increases rapidly from 172.1HV to 207.7HV when the cooling rate is 0.1 ℃/s-1 ℃/s. Due to the refinement of the microstructure and the increase of the proportion of plated bainite, when the cooling rate is 3 ℃/s-40 ℃/s, the hardness increases linearly from 214.9 HV to 261.8 HV with the cooling rate. The suitable controlled cooling interval of Sb-alloyed ferritic cryogenic steel is 3 ℃/s-40 ℃/s.
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