轧制温度对深冲纯铁CH1T盘条组织和力学性能的影响

Influence of Rolling Temperature on Microstructure and Mechanical Properties of Deep Drawing Pure Iron CH1T Wire Rod

研究了不同轧制温度对热轧盘卷显微组织和力学性能的影响,并分析了φ6.5 mm的CH1T纯铁热轧盘卷显微组织中异常长大铁素体的原因。结果表明：最佳工艺为加热温度（1120±10）℃、均热温度（1100±10）℃、吐丝温度（890±15）℃,使用带槽夹送辊传送;降低轧制温度能有效消除异常组织,能使组织均匀化,晶粒细化,CH1T纯铁抗拉强度提高;平辊夹送辊与轧件接触位置的铁素体晶粒尺寸大于其他位置的铁素体晶粒尺寸,造成混晶现象,且较大尺寸的铁素体晶粒在线材横截面的分布区域与位置随圈数的不同呈现一定的规律性。

The effects of different rolling temperatures on microstructure and mechanical properties of hot rolled coil were studied. The reason of abnormal growth of ferrite in microstructure of pure iron CHIT of φ6.5 mm hot rolled coil was analyzed. The results show that the optimum process is heating temperature of （1120±10）℃, uniform heating temperature of （1100±10）℃, spinning temperature of （890±15）℃, and using grooved pinch roll to transfer; reducing rolling temperature can efficiently eliminate the abnormal microstructure, make microstructure homogenized, grain refined, and the mechanical properties of the pure iron CHIT enhanced. Ferrite grain sizes at contact position between flat roller pinch roller and the rolled piece are larger than those at other positions, which forms the mixed crystal phenomenon. The larger sizes of ferrite grain in the distribution area and position of the cross section of the wire rod show a certain regularity with the different numbers of turns.