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为了制定船板钢的控制轧制工艺,采用MMS-300热/力模拟试验机研究了315 MPa级船板钢的热变形行为。结果表明:在高温、低速率、大变形量条件下,315 MPa级船板钢易于发生动态再结晶;随着变形间隔时间的增长,未再结晶温度逐渐降低。如果采用高变形温度、低应变速率和大变形量变形,通过动态再结晶可细化奥氏体晶粒;同时,二阶段开轧温度应低于932℃,通过变形带的生成可进一步细化奥氏体晶粒。
In order to develop the control rolling process of ship steel, the thermal deformation behavior of 315 MPa-class shipbuilding steel was studied by MMS-300 heat / force simulator. The results show that the dynamic recrystallization of 315 MPa-class ship steel tends to occur at high temperature, low rate and large deformation. With the increase of deformation interval, the temperature of non-recrystallization gradually decreases. If the high deformation temperature, low strain rate and large deformation deformation, dynamic recrystallization can be refined austenite grains; the same time, the second-stage rolling temperature should be lower than 932 ℃, through the deformation zone can be further refined Austenite grains.