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首页> 外文会议>International Conference on Microalloying for New Steel Processes and Applications; 20050907-09; Basque Country(ES) >Grain Refinement by Rapid Transformation Annealing of Cold Rolled Low Carbon Steels
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Grain Refinement by Rapid Transformation Annealing of Cold Rolled Low Carbon Steels

机译：冷轧低碳钢的快速相变退火细化晶粒

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摘要

A novel thermal treatment, rapid transformation annealing (RTA), has been applied to six different cold rolled low-carbon (LC) steel sheets with the aim of refining their microstructure. The process involves rapid heating to just above the austenite (γ) to ferrite (α) transformation temperature and subsequent rapid cooling to room temperature. Grain sizes around 2 μm in two different Nb-Ti HSLA steels, 5 μm in a Ti-LC steel and 6 μm in a plain LC (0.037%C) steel have been produced using fast cooling rates (200℃/s). Non-equiaxed structures are obtained in a Nb-Ti HSIF steel and in a plain LC (0.135%C) (CM) steel due to their higher Mn content. However, very fine equiaxed grains (2 μm) are obtained by rapid intercritical annealing (RIA) in the CM steel. Irrespective of the microalloying concept, the grain growth of recrystallized α grains before their transformation was inhibited in CM and in both HSLA steels. This inhibition is connected with the overlapping of α recrystallization and α-γ transformation processes which is essential in order to achieve extreme grain refinement either by RTA or RIA.
机译：一种新颖的热处理，快速转变退火（RTA）技术已应用于六种不同的冷轧低碳（LC）钢板，目的是改善其显微组织。该过程包括快速加热到刚好高于奥氏体（γ）到铁素体（α）的转变温度，然后迅速冷却到室温。使用快速冷却速率（200℃/ s），已在两种不同的Nb-Ti HSLA钢中形成了大约2μm的晶粒，在Ti-LC钢中形成了5μm的尺寸，而在普通LC（0.037％C）中形成了6μm的尺寸。由于Nb-Ti HSIF钢和Mn含量较高，因此在Nb-Ti HSIF钢和普通LC（0.135％C）（CM）钢中获得非等距结构。但是，通过CM钢中的快速临界退火（RIA），可以获得非常细的等轴晶粒（2μm）。与微合金化概念无关，在CM和两种HSLA钢中，重结晶的α晶粒在相变之前的晶粒长大都受到抑制。这种抑制作用与α重结晶和α-γ转变过程的重叠有关，这对于通过RTA或RIA实现极高的晶粒细化至关重要。

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