结构钢层状撕裂研究

通过对管线钢在不同温度、不同应力状态下拉伸试验,研究了温度及应力 状态对层状撕裂的影响。初步研究发现,对由连铸然后经控制轧制生产的管线钢层 状撕裂几乎总是沿中心线偏析带发生。室温下层状撕裂机制很可能为微孔聚集型。 低温下则可能沿偏析带产生脆性开裂。消除或减轻中心线偏析程度是解决层状撕裂的关键。

THE STUDY OF DELAMINATION IN THE STRUCTURAL STEELS

The influence of temperature and stress state on delamination in the pipe-line steel has been studied by tensile tests at different temperature and stress states. It is found that the' delamination always takes place along the centerline segregation band in pipe-line steel produced by continuous casting and then controlled rolling. At room temperature, the delamination appears to be caused by micrbvoid nucleation and coalecence. And the delamination appears to be caused by the cleavage cracking along (100) plane at low temperatur.e. The best way to eliminate the delamination is to reduce the degree of centerline segregation.