The size and content of secondary carbide have an important effect on the mechanical properties and wear resistance of high carbon high alloy martensitic steel.In this paper,the evolution behavior of secondary carbide during forging and spheroidizing annealing process were studied by scanning electron microscope and transmission electron microscope,and its effects on mechanical properties and wear resistance of high carbon high alloy martensitic steel were also studied with abrasion wear testing machine.The results show that spheroidizing annealing significantly increases the content and size of secondary carbide in forged and air-cooled steel.The secondary carbide refine the austenite grain size by pinning grain boundary and reduce the solid solution content of alloying elements in martensite,which effectively improves the impact toughness of experimental steel.The micron-sized secondary carbide and ductile martensite matrix hinder abrasive cutting and reduce the microscopic fracture on worn surface effectively,which improves the wear resistance of experimental steel.
high carbon high alloy martensitic steelsecondary carbidehardnessimpact toughnesswear resistance
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