Abstract
The role of annealing heat treatment (AHT)in high-temperature oxidation resistance at 700 ℃ of the laser powder bed fused (LPBFed) Ti6Al4V alloy subjected to massive laser shock peening treatment (MLSPT) was investigated. AHT transformed the acicular martensitic α′ phase into stable α and β phases and released the tensile residual stresses, significantly improving the isotropy of the LPBFed specimens. The excellent gradient compressive residual stresses, gradient microhardness, dislocation structures, nanocrystalline, and nanotwins on the obtained dense plastic deformation layer after AHT-MLSPT contributed decisively to the high-temperature oxidation resistance of the LPBFed specimens.
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