Microstructure and Mechanical Properties of Wire Laser Additive Manufactured Deposits and Their Tungsten Inert Gas Welds

Materials, Journal Year: 2025, Volume and Issue: 18(6), P. 1308 - 1308

Published: March 16, 2025

Ti-6Al-4V (Ti64) alloy is widely utilized in the aerospace industry due to its high strength, fatigue resistance, corrosion and cryogenic properties. However, raw material costs machining difficulties necessitate development of efficient manufacturing processes. This study evaluates mechanical reliability microstructure Ti64 components fabricated using wire laser additive (WLAM) subsequently joined via tungsten inert gas (TIG) welding. The WLAM process produces refined microstructures with superior properties by minimizing defects; however, insufficient optimization may result a lack fusion (LOF) porosity. Microstructural analysis revealed that deposits exhibited fine basket-weave α structure an average α-lath width 1.27 ± 0.69 μm, while TIG-welded region coarsened α-lath, reaching 3.02 2.06 which led reduction ductility. Tensile testing demonstrated properties, yield strength 910 MPa, ultimate tensile 1015 elongation 12.8%, outperforming conventional wrought alloys. Conversely, joints reduced 812 917 7.5%, primarily attributed microstructural coarsening weld region. findings this confirm enhances Ti64, whereas TIG welding introduce structural weaknesses. research provides insight into evolution behavior WLAM-fabricated components, valuable implications for their application structures.

Language: Английский

Improved Thin-Kerf Processing in Cf/SiC Composite by Waterjet-Guided Nanosecond Laser Decreases Oxidation and Thermal Effect

Materials, Journal Year: 2025, Volume and Issue: 18(7), P. 1560 - 1560

Published: March 29, 2025

As a hard and brittle material, the processing of Cf/SiC ceramic matrix composites (CMCs) faces significant challenges, especially in small-sized shapes. To address this challenge, laser with gas-assisted nanosecond (GNL) waterjet-guided (WNL) modes were applied to fabricate thin kerfs composite. The surface morphology, microstructure, chemical composition processed composite investigated comparatively. results revealed that coupling helium GNL mode could make full use energy, but resulted spattering kerf margin recast layer surface, accompanied by obvious oxidation, while waterjet WNL decreased oxidation significantly removed remelting debris, which produced clear flat surface. Due taper caused energy dissipation, single-path had limited depth. maximum depth prepared was about 328 μm, 302 μm. multi-path through composite, medium obviously influenced morphology microstructure underlying region. varied transited from top layer, covered oxide particles some cracks, bottom featured micro-grooves small oxides. consistently smooth clean broken carbon fiber residual SiC matrix. slow dissipation open environment bigger HAZ relatively serious local phase transformation degradation. isolation condition rapid cooling restrained almost keeping original microstructure. thicknesses GNL- WNL-processed 200 μm 100 respectively. lower thermal damage is instructive for

Language: Английский

Effects of rotating speed on microstructure and mechanical properties of Al/Ti friction stir welding joints with trailing support

Journal of Manufacturing Processes, Journal Year: 2025, Volume and Issue: 146, P. 44 - 54

Published: May 1, 2025

Language: Английский