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针对高速列车焊接构架用钢的性能要求,设计了一种低成本的Mn-Cu微合金低碳钢,并对该实验钢的连续冷却转变规律以及冷却工艺对组织演变的影响进行了研究。结果表明,实验钢在较宽的冷速范围(1~30℃/s)内均可以获得先共析铁素体和中温相变组织。冷却速度和卷取温度对最终组织形态和细化有着重要影响,轧制结束后立即加速冷却至500~600℃,再缓冷,可以获得以细小准多边形铁素体、针状铁素体和粒状贝氏体为主的混合组织。经实验室控轧控冷验证了具有该组织形态的12 mm中厚钢板屈服强度可达540 MPa,同时拥有良好的塑性和低温韧性。
Aiming at the performance requirements of high-speed train welding steel, a low cost Mn-Cu microalloyed low carbon steel was designed. The continuous cooling transformation of the experimental steel and the influence of cooling process on microstructure evolution were studied. The results show that the pro-eutectoid ferrite and mesophase transformation can be obtained in a wide range of cooling rate (1 ~ 30 ℃ / s). The cooling rate and the coiling temperature have an important influence on the final microstructure and grain refinement. After the rolling is completed, the cooling is accelerated to 500-600 ° C, and then slowly cooled to obtain fine quasi-polygonal ferrite, acicular ferrite and Granular bainite-based mixed tissue. Laboratory controlled rolling and controlled cooling verify that the 12 mm thick steel plate with this structure has a yield strength of 540 MPa and good ductility and low temperature toughness.