TSCR流程生产钛微合金化高强耐候钢中的析出物

运用电子显微镜和化学相分析等多种实验手段研究了Ti微合金化高强耐候钢中的析出物,并在热力学计算的基础上分析了其析出过程.结果表明:钢中主要存在TiC,TiCN,Ti₄C₂S₂,TiN等析出物,连轧前TiN的析出过程已基本完成;大量纳米尺寸的TiC球形析出物粒子在铁素体的位错线上分布;Ti含量增加改变了MC相的粒度分布,小尺寸粒子的体积分数显著增加,增强了沉淀强化的效果.

Precipitates of Ti-microalloyed high-strength weather-resisting steel produced by TSCR process

Many experimental methods such as electron microscopy and chemical phase analysis were used to study the precipitates of high-strength weather-resisting steel with titanium addition, and the precipitation process was analyzed based on thermodynamics calculations. The results showed that the main particles in the steel were TiC, TiCN, Ti₄C₂S₂ and TiN, and almost TiN particles have precipitated before hot rolling. A large number of nanometer TiC particles distributed on dislocations in ferrite. The size distri- bution of MC phase changed with increasing titanium content. The obvious increase in volume fraction of small scale particles heightened the yield strength of the steel through precipitation strengthening.