Fatigue properties of selective laser melted Ti-6Al-4V alloy subjected to laser shock processing
Source abstract
Abstract
As a superior surface treatment technology, laser shock processing (LSP) is of great value for improving the fatigue performance of additively manufactured metallic components. In this article, the effects of LSP on the microstructure and fatigue performance of selective laser melted (SLM) Ti-6Al-4V alloy were investigated. The microstructure, microhardness, high-cycle fatigue performance, and fatigue fracture morphology of SLM-built Ti-6Al-4V samples before and after LSP were characterized. The microstructure features of SLM samples before and after LSP during cyclic loading were examined with a transmission electron microscope (TEM). The results indicate that the fatigue strength of SLM samples increases by 12.5%, and the α` phase undergoes grain refinement after LSP. The microhardness of LSP-treated samples increased by 8%, and a hardened layer with a thickness of 500 μm was formed. TEM analysis suggests the formation of highly dense dislocations, dislocation networks, and substructures in LSP-treated samples during cyclic deformation. The cyclic deformation after LSP promotes the rearrangement of dislocations and the formation of subgrain boundaries. The grain refinement of the α` phase, deformed substructures, and gradient compressive residual stress layer after LSP enhanced the fatigue strength.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Surface Treatment and Residual Stress · Additive Manufacturing Materials and Processes · High Entropy Alloys Studies
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (40)
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