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根据用凸轮式塑性计和淬火-变形膨胀仪分别对一种Ti-V微合金钢的奥氏体变形行为和连续冷却转变行为所做的研究,设计了钢板轧制程序,以得到:(ⅰ)再结晶奥氏体,(ⅱ)未再结晶奥氏体,(ⅲ)变形铁素体+未再结晶奥氏体。研究了奥氏体状态和冷却速度对最终显微组织和机械性能的影响。为了从理论上解释最终铁素体晶粒尺寸随不同热机械加工工艺制度的变化,除了要考虑铁素体成核点的密度外,还必须考虑铁素体晶粒长大动力学,说明了膨胀仪研究在确定某一钢最佳变形工艺制度和冷却速度方面的好处。拉伸和冲击性能的范围宽,是由于所研究的显微组织不同造成的。屈服强度随变形铁素体、贝氏体或马氏体量的增多而提高,随铁素体晶粒尺寸的减小而提高,冲击韧性受铁素体晶粒尺寸和轧制平面出现分层的影响最为强烈。
According to the researches on austenite deformation behavior and continuous cooling transformation behavior of a Ti-V microalloyed steel with a cam-type plastometer and a quench-deformation dilatometer respectively, a rolling schedule of the steel plate is designed to obtain: (i ) Recrystallized austenite, (ii) unrecrystallized austenite, (iii) deformed ferrite + unrecrystallized austenite. The effect of austenite state and cooling rate on the final microstructure and mechanical properties was investigated. In order to theoretically explain the final ferrite grain size with different thermo-mechanical processing system changes, in addition to taking into account the density of ferrite nucleation points, but also must consider the ferrite grain growth kinetics, indicating Dilatometer study in determining the best deformation of a steel process system and the cooling rate of the benefits. The wide range of tensile and impact properties is due to the different microstructures studied. Yield strength increases with increasing amount of deformable ferrite, bainite or martensite, increases with decreasing ferrite grain size, and impact toughness is delaminated by ferrite grain size and rolling plane The most strongly affected.