Mn含量及卷取温度对TSCR流程生产Ti微合金高强钢组织与力学性能的影响

在TSCR流程上研究Mn含量和卷取温度对Ti微合金高强度钢组织与力学性能的影响。结果表明,随着钢中Mn含量的升高,铸坯与热轧成品板组织细化,其强度显著提高;而卷取温度的降低虽使热轧板组织得到细化,但抑制了纳米尺寸含Ti相的充分析出,热轧板强度降低。由此可见,在细化组织的同时提高纳米尺寸析出物数量是生产Ti微合金化高强钢的关键所在。

Effect of Mn content and coiling temperature on the microstructure and mechanical properties of Ti-microalloyed high-strength steel produced by TSCR process

The effects of Mn content and coiling temperature on the microstructures and mechanical properties of Ti-microalloyed high strength steel produced by TSCR process were investigated. The results show that higher Mn content causes finer microstructures for the continuous casting slab and hot-rolled plate, and raises the strength of Ti-microalloyed steel dramatically. On the other hand, lower coiling temperature causes finer microstructure for the hot-rolled plate; however, the full precipitation of nanometer-sized Ti-contained phases will be inhibited, and the overall strength of steel is decreased as a result. Hence, both the grain refinement and the increase of the amount of nanosized precipitates are crucial to the production of Ti-microalloyed high strength steel.