摘要
采用分段式冷却模式,研究不同的空冷时间、卷取温度、冷却速度对高扩孔钢显微组织和力学性能的影响。结果表明：随着空冷时间的延长,试验钢铁素体体积分数逐渐增加,钢的强度逐渐下降,伸长率及扩孔率逐渐提高;冷速在150℃/s时,马氏体组织转变导致钢板扩孔性能明显下降;当卷取温度为450℃、中间空冷时间为6~9 s、冷却速度为50℃/s时,可获得扩孔性能优良的600 MPa级高扩孔钢。
The effects of different air cooling time, coiling temperature and cooling rate on the microstructure and mechanical properties were studied by subsection cooling mode. The results showed that the volume fraction of ferrite,the elongation and the hole-expansion rate increased while the strength decreased with the air-cooling time increasing. The hole-expansion rate decreased significantly due to the martensite transformation at the cooling rate of 150 ℃ / s. The 600 MPa grade high hole-expanding ratio steel was produced at the cooling temperature of 450 ℃,the cooling time of 6-9 s and the cooling rate of 50℃ / s.
出处
《钢铁研究》
CAS
2016年第4期30-33,共4页
Research on Iron and Steel
关键词
高扩孔钢
冷却工艺
微观组织
扩孔率
steel with high hole-expanding ratio
cooling process
microstructure
hole expansion ratio
