1.安徽工业大学,冶金工程学院,马鞍山,243032
2.大冶特殊钢有限公司,黄石,435001
3.高品质特殊钢湖北省重点实验室,黄石,435001
周杨(1995—),男,本科,工程师;E-mail:zhouyang2023945@citicsteel.com
收稿:2025-12-12,
修回:2026-01-08,
录用:2026-01-13,
网络首发:2026-02-09,
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周杨,杨娥,谢毓敏等.4330V低合金高强钢CCT曲线测定与分析[J].特殊钢,
Zhou Yang,Yang E,Xie Yumin,et al.Determination and Analysis of CCT Curve of 4330V Low Alloy High Strength Steel[J].Special Steel,
为研究4330V低合金高强度钢的连续冷却转变行为,利用热膨胀仪进行了不同冷却速度0.05~30 ℃/s的连续冷却转变试验,采用光学显微镜、场发射扫描电镜及显微硬度计分别对不同冷却速度下相变后的材料组织形貌和维氏硬度进行检测分析,并绘制了其过冷奥氏体连续冷却转变(CCT)曲线。结果表明,当冷却速度为0.05~0.15 ℃/s时,组织主要为贝氏体+铁素体,属于高温、中温两相复合转变区,其硬度值均在450 HV以下;当冷却速度为0.2~1 ℃/s时,组织主要为贝氏体+马氏体,属于中温、低温两相复合转变区,其硬度在472~577 HV;当冷却速度≥3 ℃/s时,组织全为马氏体,属于低温马氏体转变区,硬度值均在593 HV以上。
To study the continuous cooling transformation behavior of 4330V low alloy high strength steel, experiments were conducted at different cooling rates 0.05-30 ℃/s using a quenching dilatometer. Optical microscopy, field emission scanning electron microscopy, and microhardness tester were used to detect and analyze the microstructure and Vickers hardness of the material after phase transformation at different cooling rates, and the continuous cooling transformation (CCT) curve of its supercooled austenite was plotted. The results showed that when the cooling rate was 0.05-0.15 ℃/s, the microstructure was mainly bainite + ferrite, belonging to the high-temperature and medium-temperature two-phase composite transformation zone, and the hardness values were all below 450 HV; when the cooling rate was 0.2-1 ℃/s, the microstructure was mainly bainite + martensite, belonging to the medium-temperature and low-temperature two-phase composite transformation zone, and the hardness was between 472-577HV; when the cooling rate was greater than or equal to 3 ℃/s, the microstructure was fully martensitic, belonging to the low-temperature martensitic transformation zone, and the hardness values were all above 593 HV.
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