采用热膨胀法测定6种不同成分低碳贝氏体钢的连续冷却转变（CCT）曲线。CCT曲线表明,加入微量硼能使含钒低碳贝氏体钢在大于0.3℃/s的冷速下获得贝氏体组织,而V-N微合金化的低碳贝氏体获得全贝氏体的临界冷速要高于V-B钢,且贝氏体转变的开始温度也要较V-B钢高20℃左右。在含钒、氮低碳贝氏体钢中加入钼、铬将会促进钢的贝氏体相变,但钼的作用要优于铬;钼、铬的加入可使含钒、氮低碳贝氏体钢的贝氏体转变温度降低至少30℃,且贝氏体组织得到了细化,钢的维氏硬度也提高了HV 10～30。
The continuous cooling transformation（CCT） curves of experimental steels were tested with heat dilatometer.The results show that the low carbon steel containing V and B can obtain fully bainitic microstructures more than 0.3℃/s of cooling rate.Compared to V-B steel,low carbon steels microalloying with V-N have higher critical cooling rate to achieve fully bainite,also bainite start temperature is about 20℃ higher than V-B steel.The element of Mo and Cr additions to V-N microalloyed low carbon steels can promote bainite transformation and Mo is more effective than Cr.Adding Mo and Cr into V-N microalloyed low carbon bainitic steels can lower bainite transformation temperature at least 30℃ and refine bainitic microstructures,thus increase the Vickers hardenss HV10-30.
参考文献
| [1] | 李纪委,刘庆锁.超低碳贝氏体钢的研究现状[J].天津理工大学学报,2008(01):56-59. |
| [2] | 贺信莱;尚成嘉.高性能低碳贝氏体钢-成分、工艺、组织、性能与应用[M].北京:冶金工业出版社,2008 |
| [3] | 杨才福;张永权;祖荣祥.钒氮微合金化钢的开发与应用[M].北京:钢铁研究总院,2002 |
| [4] | 李培松,肖丽俊,谢植.低碳钢中AlN和BN竞相析出热力学分析[J].钢铁研究学报,2009(05):16-18,50. |
| [5] | 杨善武;贺信莱 .硼在超低碳钢铁素体相变中的行为[J].金属学报,1999,35(01):23. |
| [6] | Cizek P;Wynne B P;Davies C H J et al.Effect of Composition and Austenite Deformation on the Transformation Characteristics of Low Carbon and Ultralow-Carbon Microalloyed Steels[J].Metallurgical and Materials Transactions,2002,33A:1331. |
| [7] | 周乐育,刘雅政,方圆,黄全伟,宋仁伯.铬对C-Si-Mn-Nb铁素体贝氏体双相钢相变规律的影响[J].钢铁研究学报,2009(07):37-41. |
| [8] | 孙本茂;王执福;公志光 .铬和钼对奥氏体-贝氏体钢的组织和性能的影响[J].铸造,1996,1:25. |
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