利用Hopkinson压杆加载装置对国产轧制态X70管线钢进行了冲击压缩实验, 研究了其在高速冲击过程中的组织演变和动态应力--应变行为. 结果表明: 轧制态X70管线钢是以针状铁素体为主的混合组织; 在$\dot{\varepsilon}\leq$2.5$\times$10$^{3}$s$^{-1}$条件下, 铁素体板条内形成了大量的位错胞亚晶结构, 随着应变率增加, 针状铁素体组织显著细化, 致使X70管线钢产生了明显的增强增塑现象.
The dynamic impact compression experiments for the X70 pipeline steel in rolling condition were carried out using the Hopkinson pressure bar. The structural evolution occurred during the plastic deformation under high strain rate, and the dynamic stress--strain behavior were investigated. The results show that the acicular ferrite dominated microstructure can be obtained for the X70 pipeline steel through rolling processing, and a lot of dislocation cells form in the ferrite laths and the ferrite laths are remarkably fragmentated under the strain rate lower than 2.5$\times$10$^{3}$s$^{-1}$, which leads to the increase in both the strength and the plasticity of the steel.
参考文献
| [1] |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%