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Updated: Jun 4, 2025
Production of Single Tracks of Ti-6Al-4V by Directed Energy Deposition to Determine the Layer Thickness for Multilayer Deposition
Published on: March 13, 2018
Formation of the Cu+Nb Interlayer in the Inconel 718/Ti6Al4V Multi-Material Obtained by Selective Laser Melting
Arseniy Repnin1, Evgenii Borisov1, Anatoly Popovich1
1Institute of Machinery, Materials, and Transport, Peter the Great St. Petersburg Polytechnic University (SPbPU), Polytechnicheskaya, 29, 195251 Saint Petersburg, Russia.
This study explored Inconel 718/Ti6Al4V multi-materials using copper and niobium interlayers fabricated via selective laser melting (SLM). The interlayers influenced interfacial microstructure and mechanical properties, achieving a 910 MPa ultimate tensile strength.
Area of Science:
- Materials Science
- Metallurgy
- Additive Manufacturing
Background:
- Inconel 718 and Ti6Al4V are critical alloys in aerospace and energy sectors.
- Joining dissimilar materials like Inconel 718 and Ti6Al4V presents significant challenges.
- Selective Laser Melting (SLM) offers potential for creating complex multi-material structures.
Purpose of the Study:
- To investigate the interfacial characteristics of Inconel 718/Ti6Al4V multi-materials with Cu and Nb interlayers produced by SLM.
- To analyze the microstructure, chemical/phase composition, and hardness of the interfacial zones.
- To determine the effect of interlayers on the mechanical properties, specifically ultimate tensile strength.
Main Methods:
- Fabrication of Inconel 718/Ti6Al4V multi-material samples using Selective Laser Melting (SLM).
- Microstructural analysis of interfacial zones.
- Chemical and phase composition analysis of interfacial regions.
- Microhardness testing across the multi-material interface.
- Tensile testing to evaluate ultimate tensile strength.
Main Results:
- Island macro-segregation observed at all interfacial zones.
- Sharp chemical transitions at Ti6Al4V/Nb and Cu/Inconel 718 interfaces; gradual transition at Cu/Nb interface (approx. 700 μm width).
- No new phases detected; typical alloy and interfacial phases present.
- Microhardness varied significantly across the interface: 270 (Ti6Al4V) → 190 (Nb) → 120 (Cu) → 300 HV (Inconel 718).
- Achieved an ultimate tensile strength of 910 MPa for the multi-material samples.
Conclusions:
- Cu and Nb interlayers effectively facilitate the joining of Inconel 718 and Ti6Al4V via SLM.
- Interlayer composition and microstructure significantly influence interfacial properties and hardness distribution.
- The fabricated multi-material components exhibit promising mechanical performance with high tensile strength.
