对一种低碳锰钢进行了Ar3之上不同终轧温度及卷取温度的TMCP工艺。OM和TEM观察表明，终轧变形在奥氏体再结晶区进行时，利于获得均匀分布的铁素体和一定量的贝氏体组织。终轧温度降低到800℃，实验钢产生了形变诱导铁素体相变。当冷速增加到60℃/s且卷取温度为400℃左右时，铁素体在晶内形核受到抑制，铁素体沿原奥氏体晶界分布，晶粒得到细化，贝氏体体积分数增加，强度有较大的提高，但延伸率较低，屈强比较高。通过控制终轧温度为800-850℃、冷却速度为40℃/s左右以及卷取温度为550℃左右时，低碳锰钢可以获得仿晶界型铁素体/贝氏体的复相组织，其中铁素体晶粒尺寸为8-8.5µm，贝氏体体积分数在20％左右，综合性能较好。
Thermo-mechanical controlled process (TMCP) experiments with various finish rolling temperature (FRT) and coiling temperature (CT) have been carried out on a low carbon manganese steel at temperatures above Ar3. OM and TEM observations indicate that the ferrite in uniform distribution and a certain amount of bainite could be obtained. Deformation induced ferrite transformation (DIFT) occurred when the FRT decreased to 800℃. Accelerated cooling (60℃/s) to 400℃ (CT) refines the allotriomorphic ferrite grain but retards the nucleation of intragranular ferrite with its distribution on prior austenite grain boundary as well as the volume fraction of bainite increased, and the strength increased but the elongation decreased and yield ratio became much higher on the steel. The good combination of mechanical properties of the steel with grain boundary allotriomorphic ferrite/banite could be gained by controlling FRT (800℃-850℃), cooling rate (40℃/s) and CT (550℃), in which ferrite grain size was about 8-8.5µm and the volume fraction of bainite about 20%.
参考文献
| [1] | |
| [2] | |
| [3] | |
| [4] | |
| [5] | |
| [6] | |
| [7] | |
| [8] | |
| [9] | |
| [10] |
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