Abstract
Microstructural defects have been considered to be detrimental to fatigue life of SLM-produced TC4. To improve the fatigue property of the alloy, pulsed magnetic field (PMT) treatment, an efficient post-processing technique, was utilized in this work. The evolution concerning fatigue life, microstructure, stress state, and fatigue fracture behavior influenced by PMT was investigated. After the treatment, the average fatigue life under a certain load is increased by 471.13%, and the reliability of the life of the specimen is improved. The mechanism that PMT action on the microstructure lies in dislocation motion. It can be found dislocation density decreased evidently with more uniform distribution. Furthermore, with the influence of dislocation, superficial and internal residual stress (RS) of the material, in terms of magnitude, decreased by more than 60% and 10%, respectively. And superficial RS changed from a tensile state to a compressive state. Besides, the treated specimen exhibited better fracture behavior by comparatively analyzing microstructure alongside fatigue initiation. According to this comparison related to the primary slip system and dislocation, improvement of PMT on fatigue performance of SLM-ed TC4 can be validated.
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