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利用光学和扫描电子显微镜观察2CR13管线钢在冲击载荷下变形以及断裂的过程,分析了石油输送管道用2CR13管线钢在服役过程中的变形及断裂行为。研究表明:在该材料的变形过程中,由于管线钢是由马氏体和铁素体组成的材料,铁素体强度低,而马氏体强度高,所以变形首先会在铁素体中进行,随着变形量的增加,应力不断增加,材料在微观组织中会出现明显的沿着力的方向分布、进而扩展到马氏体的裂纹。裂纹的扩展与所受的应力大小有很大关系。最终,在2CR13变形的整个过程中,将会观察到3种裂纹方式:夹杂物断裂、相界面断裂和马氏体基体断裂。
The deformation and fracture of 2CR13 pipeline steel under impact load were observed by optical and scanning electron microscopy. The deformation and fracture behavior of 2CR13 pipeline steel during service were analyzed. The results show that in the deformation process of the material, the pipeline steel is composed of martensite and ferrite, and the ferrite has low strength and high martensite strength, so the deformation is firstly carried out in the ferrite , With the increase of the deformation, the stress increases continuously, the material will appear in the microstructure along the direction of the force distribution, and then extended to the martensite cracks. Crack expansion and the size of the stress suffered a great relationship. Finally, three modes of cracking were observed throughout the deformation of 2CR13: inclusions, interfacial fracture and martensite fracture.