Papers by Keyword: Abnormal Microstructure

Abstract: In hot rolling process of 2205 duplex stainless steel, it was found that bright line defects are mainly located at where is about distance of 200 mm from two sides of hot rolled plate. The forming reason of bright line defects is studied by means of metallographic microscope, scanning electron microscope (SEM) combined with energy dispersive spectrometer (EDS). It is concluded that the formation of bright line defects has associated with sticking and that the temperature reduction on the edge of hot rolling plate causes a high percentage of austenite phase which is network structure. In order to prevent or avoid the happening of the sticking phenomenon, it is necessary to uniformly distribute the oxide on the strip surface by controlled rolling process.

Abstract: The present studies are to investigate the microstructure features and macroscopical hardness during transformation from austenite to pearlite without and with 12T magnetic field on Fe-1.1%C alloy. It is found that 12T magnetic field can increase the area fraction of abnormal microstructure and the average width of secondary cementite in Fe-1.1%C alloy by remarkably decreasing the Gibbs energy needed for the ferrite transformation. The macroscopical hardness of the specimens heated with 12Tmagnetic field is lower than the specimens without magnetic field. The reason is that the magnetric field increase the lamellar spacing of pearlite