张婧,赵志博,辛文彬,谷静远,罗果萍,彭军

• 1:内蒙古科技大学材料与冶金学院
• 2:内蒙古科技大学白云鄂博共伴生矿资源高效综合利用省部共建协同创新中心

摘要(Abstract)：

利用Gleeble-3800热/力模拟机研究了Nb-V-Ti-N微合金钢的动态连续冷却转变规律，并探讨了再结晶区变形后冷速对其组织及性能的影响。结果表明：当冷速由0.1℃/s增大至30℃/s时，实验钢发生铁素体、珠光体、贝氏体和马氏体相变，冷速区间分别为0.1～30℃/s、0.1～8℃/s、3～30℃/s和15～30℃/s;随着冷速的增大，铁素体、珠光体和贝氏体相变温度分别由785、682和498℃降低到625、553和415℃,而马氏体相变温度则由342℃升高为365℃。当冷速由3℃/s增大至8、20和30℃/s时，钢中大角度晶界占比由0.734不断减少到0.509;平均有效晶粒尺寸先由10.62μm减小到7.46μm后增大到9.61μm,最小值在20℃/s获得；平均KAM值先由0.419°略降低到0.407°后升高到0.691°,最小值在8℃/s获得。此外，当冷速由0.1℃/s增大至30℃/s,实验钢的显微硬度由(197±23.3) HV0.1逐渐增加到(316±11.8) HV0.1,屈服强度由(475±67.1) MPa增加到(818±33.9) MPa。分析可知，为了获得良好的强度-韧性配合，实验钢再结晶区变形后适宜的冷速为8℃/s。

关键词(KeyWords)： Nb-V-Ti-N微合金钢;冷却速率;组织演变;动态连续冷却转变曲线;力学性能

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(52104333,51804170,51874186)

作者(Author): 张婧,赵志博,辛文彬,谷静远,罗果萍,彭军

DOI: 10.13289/j.issn.1009-6264.2023-0030

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