CAJ | 학술논문

固定化学成分和其他工艺参数，研究了紧凑式带钢生产卷取温度变化(625和579℃对Ti微合金化高强钢组织和力学性能的影响。热轧带钢的力学性能测试表明，卷取温度降低后，屈服强度降低205 MPa，而-20℃冲击功由11.7 J增加到47 J。采用光学金相、电子显微术等手段分析了钢中组织和析出物，625℃卷取带钢为铁素体组织，579℃卷取带钢组织更为细小，贝氏体特征明显；而卷取温度降低后纳米尺寸碳化物的数量显著减少，由此降低了沉淀强化效果，造成强度大幅下降，并与组织细化一起改善材料的韧性。卷取温度是 Ti 微合金化高强钢生产中重要的工艺参数，需要严格控制。
고정화학성분화기타공예삼수，연구료긴주식대강생산권취온도변화(625화579℃대Ti미합금화고강강조직화역학성능적영향。열알대강적역학성능측시표명，권취온도강저후，굴복강도강저205 MPa，이-20℃충격공유11.7 J증가도47 J。채용광학금상、전자현미술등수단분석료강중조직화석출물，625℃권취대강위철소체조직，579℃권취대강조직경위세소，패씨체특정명현；이권취온도강저후납미척촌탄화물적수량현저감소，유차강저료침정강화효과，조성강도대폭하강，병여조직세화일기개선재료적인성。권취온도시 Ti 미합금화고강강생산중중요적공예삼수，수요엄격공제。
Keeping chemical composition and other parameters unchanged, the effects of coiling temperature (625 and 579℃) on the microstructure and properties of Ti-microalloyed high strength steel were investigated during compact strip production (CSP). Experimental results of mechanical properties show that compared with steel strips coiled at 625 ℃, the yield strength of steel strips coiled at 579 ℃ decreases by 205 MPa, but the impacting energy at -20 ℃increases from 11.7 J to 47 J. Optical microscopy and electron microscopy were used to study the microstructure and precipitates in the steel. It is found that the primary microstructural constituent of steel strips coiled at 625℃is ferrite grains, but the microstructure of steel strips coiled at 579℃is finer and characterized with bainite grains. The volume fraction of nanometer carbides in steel strips significantly reduces with decreasing coiling temperature, which weakens the precipitation hardening effect and causes a marked reduction of strength. However, the toughness is improved due to grain refinement and volume fraction decreasing of precipitates. Coiling temperature needs to be strictly controlled, because it is a more important parameter of producing Ti-microalloyed high strength steel.