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本文主要采用高温压缩和高温扭转变形方法,研究了0.04％V低碳钢和Ti处理16Mn钢的高温变形行为和动态再结晶规律。 研究工作主要有:1)金属材料高温变形与动态再结晶(DRX)行为。2)绘制热形变奥氏体的组织状态图。3)形变参数对热形变奥氏体动态再结晶晶粒尺寸的影响。结果表明,应变速率,形变量ε,形变温度T和原始晶粒尺寸D_0对(σ-ε)曲线和DRX行为有很大的影响。热形变奥氏体DRX晶粒尺寸dr不仅与Z[Z=·exp(Q/RT)]参数有关,而且在完全DRX区的一定形变量范围内还与形变量ε有关。dr随ε增大而减小。当形变量达到一临界值时,趋向一恒定值。超过此临界值,DRX晶粒尺寸dr不再与形变量ε有关,而仅决定于Z参数。
In this paper, high-temperature compression and high-temperature torsional deformation were used to study the deformation behavior and dynamic recrystallization at high temperature of 0.04% V mild steel and Ti-treated 16Mn steel. The main research work includes: 1) High temperature deformation and dynamic recrystallization (DRX) behavior of metallic materials. 2) Draw the hot deformed austenite organizational state diagram. 3) Effect of Deformation Parameters on Dynamic Recrystallization Grain Size of Hot Deformed Austenite. The results show that strain rate, deformation ε, deformation temperature T and original grain size D 0 have a great influence on (σ-ε) curve and DRX behavior. DRX grain size dr of hot-deformed austenite is not only related to the Z [Z = · exp (Q / RT)] parameter but also depends on the amount of deformation, ε, within a certain amount of deformation in the complete DRX region. dr decreases as ε increases. When the deformation reaches a critical value, tends to a constant value. Above this critical value, DRX grain size dr no longer depends on the deformation ε, but only on the Z parameter.