高硼钢的组织与性能

用真空感应炉制备硼分布均匀的高硼钢,分析了其铸态和热轧态的显微组织.钛的加入减少了在晶界处析出的铁硼相Fe2B,FeB的数量,改善了其在GB的分布状态.钛硼相TiB2弥散地分布在铁素体基体上.确定了高硼钢热轧成形的合理工艺参数为加热温度1080～1120℃,初轧温度1070～1110℃,终轧温度810～850℃,道次压下量约10%～20%.采用多道次循环轧制,随后的冷却方式为空冷.热轧后高硼钢的力学性能得到明显提高.

Microstructure and Properties of High-Boron Steel

The as-cast and hot rolling microstructures of high-boron steel prepared from vacuum induction furnace were investigated, in which the element B was uniformly distributed. Titanium added into it had a significant effect on decreasing the amount of Fe2B and FeB precipitated at grain boundaries and increasing the distribution of boron within the grain and grain boundaries, with precipitations of TiB2 distributing dispersively and uniformly on ferritic matrix. The hot rolling conditions were determined reasonably by simulation, i.e., the soaking temperature was 1080-1120°C, slab rolling temperature was 1070-1110°C, finish rolling temperature was 810-850°C and pass reduction ratio was 10%-20%. After multi-pass rolling and subsequent air-cooling, the mechanical properties of the high-boron steels were enhanced significantly.