Abstract
A batch of medical orthopedic screwdriver T15 products require a torque of 7.5 N·m, and the torque test after mass production is lower than 6.5 N·m, which cannot meet the process requirements. The fracture morphology and microstructure were characterized by stereo microscope (SM), optical microscope (OM) and field emission electron microscope (SEM), respectively. Their mechanical properties were evaluated by Vickers hardness tester and torque tester. The research results indicate that the failure of T15 screwdriver was predominantly by the mechanism of ductile fracture which occurred at the point of maximum torque force at the outermost shear plane. By increasing the solid solution temperature to 1050 °C and using surface shot peening treatment, microstructure and segregation milling tool marks were eliminated, surface compressive stress was increased, and the torque reached 7.8 N·m.
Published Version
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