高碳珠光体钢挤压变形过程中的组织演变

Microstructure Evolution of High Carbon Pearlitic Steel in Extrusion Deformation Process

在试验温度为650℃的情况下,对原始材料组织为层片状高碳珠光体的T8钢进行等通道角多道次挤压变形,同时根据AFM、TEM和SEM表征了材料在挤压变形过程中其渗碳体片层的组织演变过程。结果表明,层片状渗碳体有较强的塑性变形性能,通过产生扭折、断裂及弯曲等方式来缓和塑性变形所带来的剧烈影响;从二维角度观察到的变形过程及结果与从三维立体角度观察的相吻合。

The equal channel angular multi-pass extrusion deformation for T8 high carbon pearlitic steel whose structure is lamellar was conducted at 650 %, and the microstructure evolution processes of T8 steel were characterized by AFM, TEM and SEM. The results show that the lamellar cementite layer has the strong performance of plastic deformation, the severe impact caused by plastic deformation were relaxed by torsion, fracture and bending. The deformation processes and results observed from the angle of two-dimensional and three-dimensional is consistent.