Mechanical Properties and Fracture Characteristics of Ultra-microduplex Structure in High Carbon Steel
The ultra-microduplex structure was fabricated in the high carbon steel with a fully pearlitic structure after severe plastic deformation.The microstructures,before and after the deformation,were observed by scanning electron microscopy (SEM),transmission electron microscopy (TEM)and atomic force microscope (AFM).The mechanical properties of the ultra-microduplex structure were investigated using mini-tensile tests and the morphologies of fracture surfaces were both observed with scanning electron microscopy (SEM).The results show that the sizes of ferrite grains and cementite particles were about 0.4 μm and 0.1 ~0.2 μm,respectively.AFM observationis consistent with the SEM and TEM results.The tensile strength of the ultra-microduplex structure and the lamellar pearlite are almost at the same level,but after warm deformation,the yield strength was obviously increased and correspondingly,the elongation and the reduction of area were 19.2%,32.1%,respectively,which are markedly higher than those of the lamellar pearlite.The tensile fracture of the ultra-microduplex structure is typical ductile fracture,however the fracture of original lamellar pearlite appears a mixture of cleavage fractures and quasi cleavage fractures.
Ultra-microduplex structure pearlite mechanical properties fracture characteristics
Xiong Yi Guo Zhiqiang He Hongyu
School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471 School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471
国际会议
上海
英文
227-227
2012-10-19（万方平台首次上网日期，不代表论文的发表时间）