600MPa级热轧双相钢分段冷却精度控制及组织性能研究

• 作 者: 孙明军 赵楠 夏小明
• 机 构: 东北大学材料各向异性与织构教育部重点实验室材料科学与工程学院,上海梅山钢铁股份有限公司技术中心,上海梅山钢铁股份有限公司热轧板厂,
• 出 处: 热加工工艺
• 发表日期: 2017年13期
• 关键词: 双相钢 Pa 成形性 分段冷却 温卷 精度控制 屈强比 模型控制 纤维织构 试验钢

研究了热轧双相钢分段冷却精度的控制方法以及对中温和低温卷取双相钢组织性能的影响。结果表明:根据不同化学成分及相变区特点,采用合适的分段冷却工艺及模型控制方法,可生产出组织性能优良的热轧双相钢。中温卷取双相钢的强度比低温卷取的偏低,主要原因是空冷时间较长,铁素体转变的驱动力及形核点降低,以及第二段冷却Cr、Mo元素的淬透性不能充分发挥影响,但其屈强比和扩孔率较低温卷取钢稍好。两种成分及工艺的双相钢均形成了明显的γ-纤维织构,说明试验双相钢具有良好的成形性。

The control method of the subcooling accuracy of the hot-rolled dual-phase steel and the influence on the microstructure and properties of the coiled dual-phase steel were studied. The results show that hot rolled dual phase steel with excellent microstructure and properties can be produced according to the characteristics of different chemical compositions and phase transformation zones by the suitable sub - cooling technology and model control method. The strength of dual-phase steel coiling at low temperature is lower than that at low temperature coiling. The main reason is the longer air-cooling time, the lower driving force and nucleation point of ferrite transformation and the hardenability of Cr and Mo elements Can not give full play to its impact, but the yield strength and hole expansion rate of the lower temperature coiling slightly better. Two-phase steel with both composition and process formed obvious γ-fiber texture, indicating that the test dual-phase steel has good formability.