Abstract: The numerical simulation on process parameters of AISI4340 Steel Φ600 mm cast bloom to 300 mm x 300 mm square billet breakdown has been carried out by Deform-3D software. The effects of heating temperature, rolling speed, reduction ratio and two passes reduction on rolling bloom center deformation and material flow are studied, the equivalent stress and material deformation characteristics of the center during the deformation process are analyzed to get forming law of Φ600 mm round continuous casting bloom rolling into 300 mm square bloom. The results show that the heating temperature has little effect on die strain of the core at 1 070 ~ 1 140 °C ,and the variation range is about 2.3%. When the rolling speed is 1.0 ~ 2. 0 m/s and the total reduction is fixed ,it is better to weld the core defects at deformation of first big then small

Key words: AISI4340 Steel, , Φ600 mm Cast Bloom, Breakdown, Equivalent Strains, Simulation, Deform-3D

摘要： 利用Deform-3D软件对AISI4340钢Φ600 mm铸坯至300 mm×300 mm坯的开坯过程工艺参数进行了数值模拟。通过对加热温度、轧制速度、压下率、2道次压下对铸坯心部变形和材料流动影响的研究,分析了开坯成形过程中心部等效应力和材料变形特点,获得了Φ600圆连铸坯开坯成300 mm方坯的成形规律。结果表明:在1 070～1 140℃内,加热温度对心部的应变影响较小,变化幅度在2.3%左右。当轧制速度选1.0～2.0 m/s、总压下量一定的情况下,先大后小更利于心部缺陷的焊合。

关键词: AISI4340钢, Φ600mm铸坯, 开坯, 等效应变, 模拟, Deform-3D,