支架用热轧变形高钛钢板TiC析出及力学性能分析

TiC precipitation and analysis on mechanical properties of hot rolled deformation high titanium steel plate for support

选择支架用热轧态真空冶炼高钛钢板作为测试材料,通过控制轧制变形程度获得特定结构的马氏体组织,对比了不同轧制变形程度下的钢材组织形貌和TiC析出相变化,同时测试了钢材的力学性能变化。研究结果表明:逐渐增大热轧变形量后,得到了更细小的晶粒,并且形成了宽度尺寸更小的马氏体板条束;形成的TiC颗粒尺寸更加均匀且显著缩小,并实现充分碎化且分布均匀;形成了比例更大、粒径不超过Φ15 nm的TiC颗粒,奥氏体的变形程度也明显增大,生成了更细小的纳米TiC颗粒;试样获得了更高的拉伸强度与屈服强度,形成了更大的非均匀伸长率,均匀伸长率则保持恒定,试样的冲击性能也呈现增大趋势。

The hot-rolled vacuum-smelted high titanium steel plate for support was selected as the test material,and the martensitic structure with a specific structure was obtained by controlling the degree of rolling deformation degree.Then,the microstructure and TiC precipitated phase changes of the steel under different rolling deformation degrees were compared,and the changes of mechanical properties of the steel were tested at the same time.The research results show that after gradually increasing the hot rolling deformation amount,the finer grains are obtained,and the martensite lath bundles with smaller width dimensions are formed;the sizes of TiC particles are more uniform and significantly reduced,and the TiC particles are fully fragmented and uniformly distributed;a larger proportion of TiC particles with a particle size of no more thanΦ15 nm is formed,and the degree of austenite deformation also increases significantly,forming finer nano-TiC particles;the specimen reaches higher tensile strength and yield strength,forms a larger non-uniform elongation,while the uniform elongation remains constant,and the impact performance of specimen also shows an increasing trend.