Based on a system of macro & micro fracture appearance observation, energy spectrum analysis, metallurgical structure inspection and hardness test, the fracture mechanism and cause of specimen of 16Mn steel were obtained. The results showed that the large load was the main reason for the 16Mn steel specimen fracture, the fracture surfaces were different dimensional equiaxed dimples and some spherical particles which contain higher Mn, Si and O. The spherical particles may be an oxide which may be caused by the manufacturing process.
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