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03℃/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HV10~30。
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 03℃/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.
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