Akademik Veri Yönetim Sistemi
3rd International Conference of Engineering Against Failure, ICEAF 2013, Kos, Yunanistan, 26 - 28 Haziran 2013, ss.126-132
In this study, fractographical and microstructural examinations of an eutectoid steel failed in the service condition were carried out to investigate the effect of heat treatment on the failure. The fracture surface was initially examined by scanning electron microscope to determine the fracture type and possible paths for crack propagation. In the next step, the cross section of the steel was prepared by metallographical techniques and the matrix phases were determined using light microscope in the etched condition. It is concluded that (i) the steel has a mixture fracture consisting of typical intergranular fracture and quasi cleavage fracture, (ii) the matrix exhibits segregation regions as band structure and it includes burst martensite in addition to retained austenite, (iii) several internal cracks are formed in the matrix due to the quenching effect, (iv) burst martensitic regions are very effective on the formation of intergranular fracture and retained austenite possibly plays an important role to form quasi cleavage fracture under loading.