Mg和Zr对FH40级船板钢连续冷却转变曲线的影响
发布时间：2019-06-18 20:50
【摘要】：以FH40高强度级别船板钢为研究对象,利用真空感应炉冶炼了不同Mg、Zr成分的实验钢,采用Gleeble-3800热模拟试验机测定了实验钢连续冷却转变曲线(CCT)。采用金相显微镜系统研究了实验钢连续冷却条件下的组织演变规律,并探讨了Mg、Zr单独和复合添加对实验钢CCT曲线中铁素体和贝氏体相区的作用规律。结果表明,Mg、Zr及Mg-Zr添加均能影响过冷奥氏体和珠光体开始转变温度;Mg和Mg-Zr添加抑制了铁素体转变,促进了贝氏体转变,在5~30℃/s冷却速度范围内均获得以贝氏体为主的组织;Zr添加扩大了铁素体区,减小了贝氏体区,冷却速度提高至20℃/s以上可得到以贝氏体为主的组织。研究结果对进一步明确Mg、Zr对低碳微合金钢组织特征的作用规律,指导Mg、Zr及Mg-Zr处理在工业上的应用具有重要意义。
[Abstract]:Taking FH40 high strength ship plate steel as the research object, the experimental steel with different Mg,Zr composition was smelted by vacuum induction furnace, and the continuous cooling transformation curve (CCT). Of the experimental steel was measured by Gleeble-3800 thermal simulation testing machine. The microstructure evolution of experimental steel under continuous cooling condition was studied systematically by metallographic microscope, and the effect of Mg,Zr alone and compound addition on Ferrite and bainitic phase zone in CCT curve of experimental steel was discussed. The results show that the initial transformation temperature of supercooled Austenite and pearlite can be affected by the addition of Mg,Zr and Mg-Zr. The addition of Mg and Mg-Zr can inhibit the transformation of ferrite and promote the transformation of bainite, and the microstructure dominated by bainite can be obtained in the cooling rate range of 5 鈮，
本文编号：2501785
[Abstract]:Taking FH40 high strength ship plate steel as the research object, the experimental steel with different Mg,Zr composition was smelted by vacuum induction furnace, and the continuous cooling transformation curve (CCT). Of the experimental steel was measured by Gleeble-3800 thermal simulation testing machine. The microstructure evolution of experimental steel under continuous cooling condition was studied systematically by metallographic microscope, and the effect of Mg,Zr alone and compound addition on Ferrite and bainitic phase zone in CCT curve of experimental steel was discussed. The results show that the initial transformation temperature of supercooled Austenite and pearlite can be affected by the addition of Mg,Zr and Mg-Zr. The addition of Mg and Mg-Zr can inhibit the transformation of ferrite and promote the transformation of bainite, and the microstructure dominated by bainite can be obtained in the cooling rate range of 5 鈮，
本文编号：2501785
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