Fine-grained low-stress electrospark-laser-ultrasonic hybrid additive manufacturing method

CN122252633APending Publication Date: 2026-06-23TAIZHOU VOCATIONAL COLLEGE OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
TAIZHOU VOCATIONAL COLLEGE OF SCI & TECH
Filing Date
2026-04-21
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

Traditional laser additive manufacturing technology struggles to simultaneously achieve synergistic optimization of stress control and microstructure refinement. This results in minute deformations of components in aerospace and energy equipment fields affecting assembly accuracy and service safety, while coarse grain structures reduce strength and toughness.

Method used

A cyclic additive manufacturing method combining electrical discharge deposition, laser remelting, and ultrasonic impact is employed to deposit metal substrates layer by layer, forming fine-grained, low-stress components.

Benefits of technology

The surface of the additively manufactured component exhibits a compressive stress state and has an ultrafine equiaxed grain structure, which significantly improves fatigue life and service reliability, and enhances tensile mechanical properties and toughness.

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Abstract

This invention relates to the field of additive manufacturing technology and discloses a fine-grained, low-stress electrical discharge-laser-ultrasound composite additive manufacturing method. The method comprises the following steps: performing electrical discharge deposition-laser remelting-ultrasound impact cyclic additive manufacturing on a metal substrate surface to obtain the additively manufactured component. The additively manufactured component prepared by this method exhibits a compressive stress state on its surface, which is beneficial for suppressing fatigue crack initiation and propagation, significantly improving the fatigue life and service reliability of the component. Furthermore, the additively manufactured component prepared by this method possesses significant fine-grained microstructure characteristics and achieves a synergistic improvement in strength, plasticity, and toughness.
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