Study on the Hot Ductility of Low Carbon Steel Q345B Bloom
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摘要: 采用Gleeble 1500热模拟机对Q345B钢在1×10-4s-1和1×10-3s-1应变速率下的热塑性进行了研究。研究表明:在1×10-4s-1的应变速率下,试样在600~TL℃的温度范围内存在两个脆性区,即高温脆性区,为1 217~TL℃,低温脆性区,为600~930℃;在1×10-3s-1的应变速率下,试样在600~TL℃的温度范围内不存在高温脆性区,仅存在低温脆性区,为600~915℃。影响Q345B钢热塑性的主要因素是S偏析、应变速率、铁素体的析出以及细小的AlN粒子的析出。Abstract: Hot ductility of low carbon steel Q345 B bloom was tested by Gleeble 1500 thermo-mechanical simulator at the strain rate of 1×10-4s-1and 1×10-3s-1respectively.The results indicated that there were two brittle zones at the temperature ranging from 600~TL℃ when the strain rate was at 1×10-4s-1,that is,high temperature brittle zone (1 217~TL℃) and low temperature brittle zone (600~930℃).When the strain rate was at 1×10-3s-1,however,there was only low temperature brittle zone (600~915℃) at the temperature ranging from 600~TL℃.The main factors influencing hot ductility of this steel were S segregation,strain rate,proeutectoid ferrite as well as precipitation of fine AlN particles.
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Key words:
- low carbon steel /
- ductility /
- strain rate /
- precipitates
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