Influence of heating rate on anisothermal recrystallization in low and ultra-low carbon steels
Influence of heating rate on anisothermal recrystallization in low and ultra-low carbon steels
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DOI：
10.1016/s0921-5093(00)01882-7
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发表时间：
2001-05
期刊：
影响因子：
6.4
通讯作者：
D. Muljono;M. Ferry;D. Dunne
中科院分区：
文献类型：
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作者：
D. Muljono;M. Ferry;D. Dunne
通过高速退火实验，研究了加热速度对碳含量在0.003- 0.05%C范围内的钢的再结晶动力学、晶粒尺寸和织构的影响。将钢冷轧至70%的压下量，随后以50至1000°C s-1的加热速率退火至600至900°C的峰值温度（Tp）。为了最小化与高温下快速等温重结晶相关的掩蔽效应，所有样品在达到Tp的0.05 s内进行水淬。对于所研究的钢，非等温再结晶速率和最终晶粒尺寸随加热速率的增加而减小。这些结果不支持先前的工作，其中得出的结论是，超快速软化（这与在高加热速率下观察到的再结晶温度降低和晶粒尺寸增加有关）发生在加热速率超过500°C s−1时。目前的结果，连同模拟使用的非等温退火模型，表明“超快速软化”很可能是这些早期的实验的一个文物。
High-rate annealing experiments were carried out to study the effect of heating rate on the recrystallization kinetics, grain size and texture of steels with a range of carbon levels (0.003–0.05% C). The steels were cold-rolled to 70% reduction and subsequently annealed at heating rates from 50 to 1000°C s−1to peak temperatures (Tp) in the range 600 to 900°C. To minimise masking effects associated with rapid isothermal recrystallization at high temperature, all samples were water-quenched within 0.05 s of reaching Tp. For the steels investigated, the rate of anisothermal recrystallization and the final grain size decrease with increasing heating rate. These results do not support previous work in which it was concluded that ultra-rapid softening (which was associated with an observed decrease in recrystallization temperature at high heating rate and increase in grain size) occurs at heating rates in excess of 500°C s−1. The present results, together with simulation using an anisothermal annealing model, indicate that ‘ultra-rapid softening’ is likely to be an artefact of these earlier experiments.