1. School of Material Science and Engineering, University of Science and Technology Beijing, Beijing 100083,China 2. Institute for Engineering Steel, Central Iron and Steel Research Institute, Beijing 100081, China 3. China Petroleum Engineering and Construction Corporation, Beijing 100120, China
Microstructures and Mechanical Properties of X100 Pipeline Steel Strip
1. School of Material Science and Engineering, University of Science and Technology Beijing, Beijing 100083,China 2. Institute for Engineering Steel, Central Iron and Steel Research Institute, Beijing 100081, China 3. China Petroleum Engineering and Construction Corporation, Beijing 100120, China
ժҪ Dynamic CCT (continuous cooling transformation) curves and effects of microstructures and M/A islands of X100 hot rolled strip on mechanical properties were studied by means of a thermal simulator, a scanning electron microscope (SEM), a transmission electron microscope (TEM), a digital micro-hardness tester and Image-Pro Plus analysis software. The results show that high contents of C and Mo can make transformation lines of acicular ferrite and bainite shift rightward. High Mo tested strip has higher strength and micro-hardness and lower toughness than the other one because lath bainite appears instead of quasi-polygonal ferrite. Tested strip with granular bainite, lath bainite and M/A islands has better mechanical properties and in the microstructures lath bainite content is around 36��5% and M/A islands are fine and disperse in the matrix.
Abstract��Dynamic CCT (continuous cooling transformation) curves and effects of microstructures and M/A islands of X100 hot rolled strip on mechanical properties were studied by means of a thermal simulator, a scanning electron microscope (SEM), a transmission electron microscope (TEM), a digital micro-hardness tester and Image-Pro Plus analysis software. The results show that high contents of C and Mo can make transformation lines of acicular ferrite and bainite shift rightward. High Mo tested strip has higher strength and micro-hardness and lower toughness than the other one because lath bainite appears instead of quasi-polygonal ferrite. Tested strip with granular bainite, lath bainite and M/A islands has better mechanical properties and in the microstructures lath bainite content is around 36��5% and M/A islands are fine and disperse in the matrix.
2014, Vol. 21 
