Effect of heat input on microstructure and mechanical properties of pulsed laser welded joints in Ti6Al4V/Nb dissimilar alloys

Gao, Xiaolong; Liu, Jing; Zhang, Lin Jie

doi:10.1007/s00170-017-1134-z

Cited by 16 publications

(5 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It can be seen from the phase diagram of Ti-Nb binary alloy that Nb and Ti can form an infinite solid solution. Gao et al [17] have confirmed through experiments that no IMC brittle phase was formed during the welding process of Ti6Al4V/Nb dissimilar alloys. Gao et al [18] avoided the formation of a Ti x Cu y brittle phase by preventing the mixing of Ti and Cu in the melt pool through the Nb interlayer and successfully prepared Ti6Al4V/Cu welded joints.…”

Section: Introductionmentioning

confidence: 92%

Laser Additive Manufacturing of TC4/AlSi12 Bimetallic Structure via Nb Interlayer

et al. 2022

View full text Add to dashboard Cite

The TC4/AlSi12 bimetallic structures (BS) with Nb interlayer transition were fabricated by laser additive manufacturing (LAM). The results showed that the TC4/AlSi12 BS with Nb interlayer prepared with optimized process parameters can be divided into three regions (the TC4 region, Nb region and the AlSi12 region) and two interfaces (the TC4/Nb interface and the Nb/AlSi12 interface). The high melting point (Ti, Nb) solid solution formed in the Nb region acted as a diffusion barrier between the TC4 alloy and the AlSi12 alloy, thereby effectively inhibiting the formation of Ti-Al intermetallic compounds (IMCs). With the decrease of the laser output power for AlSi12 deposition, the NbAl3 IMC changed from layered to dispersed distribution, while γ-TiAl and Ti5Si3 IMC disappeared, thus significantly reducing the crack susceptibility of the BS deposited layer. The tensile strength of TC4/AlSi12 BS with Nb interlayer was about 128MPa, and the fracture was located near the Nb/AlSi12 interface.

show abstract

Section: Introductionmentioning

confidence: 92%

Laser Additive Manufacturing of TC4/AlSi12 Bimetallic Structure via Nb Interlayer

et al. 2022

View full text Add to dashboard Cite

show abstract

“…[8][9][10] Therefore, high quality welding of titanium and nickel alloys can combine their advantages and increase the design flexibility and hence the product functionality. 11,12 However, the direct joining of Ti alloys with Ni alloys is highly challenging due to the formation of brittle phases, cracks, and residual stresses in the weldment. This is owing to the difference in physical and chemical properties of these alloys, resulting in degradation of mechanical properties of the joint.…”

Section: Introductionmentioning

confidence: 99%

Dissimilar P-TIG welding between Inconel 718 and commercially pure Titanium using niobium interlayer

Shehbaz

Junaid

Khan

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part E:

View full text Add to dashboard Cite

The formation of brittle intermetallics is a challenge for the direct joining of commercially pure titanium (CpTi) and Inconel 718 (IN718) alloy. In the present work, dissimilar weldments using the P-TIG (Pulsed-Tungsten Inert Gas) welding technique were produced, with elemental Niobium (Nb) as an interlayer. The insertion of Nb acted as a barrier and suppressed the interdiffusion of Ti and Ni across the interlayer resulting in no TixNiy intermetallic compounds (IMCs) at the CpTi/IN718 dissimilar joint. Titanium (Ti) and Nb on CpTi side joined by solid solution (Ti, Nb) strengthening mechanism. Nickel (Ni) joined with Nb at IN718 side via eutectic reaction, where a diffused layer comprising of NbNi3, and Nb7Ni6 IMCs was found. Owing to the formation of brittle IMCs (NbNi3, Nb7Ni6), the diffused layer at Nb/IN718 interface exhibited the microhardness of ∼782 HV, which is ∼64% higher than the Nb/CpTi interface and considered highest in comparison to the other regions of the joint. The maximum tensile strength of the weldment was 150 MPa, which is significantly less than CpTi (360 MPa) and IN718 (850 MPa) base alloys possibly due to the presence of cracks in the diffused layer and the welded joint.

show abstract

“…However, in general, a problem arises when the direct joining of the two alloys is compromised by the formation of brittle Ni/Ti IMCs [13][14][15][16][17]. This problem can be overcome, however, by the choice of a proper welding process, input process parameters, and the insertion of a suitable metallic interlayer between the base alloys [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Investigating Nanoindentation Creep Behavior of Pulsed-TIG Welded Inconel 718 and Commercially Pure Titanium Using a Vanadium Interlayer

Shehbaz

Khan

Junaid

et al. 2021

Metals

View full text Add to dashboard Cite

In a dissimilar welded joint between Ni base alloys and titanium, creep failure is a potential concern as it could threaten to undermine the integrity of the joint. In this research, the mechanical heterogeneity of a Pulsed TIG welded joint between commercially pure titanium (CpTi) and Inconel 718 (IN718) with a vanadium (V) interlayer was studied through a nanoindentation technique with respect to hardness, elastic modulus, and ambient temperature creep deformation across all regions (fusion zones and interfaces, mainly composed of a dendritic morphology). According to the experimental results, a nanohardness of approximately 10 GPa was observed at the V/IN718 interface, which was almost 70% higher than that at the V/CpTi interface. This happened due to the formation of intermetallic compounds (IMCs) (e.g., Ti2Ni, NiV3, NiTi) and a (Ti, V) solid solution at the V/IN718 and V/CpTi interfaces, respectively. In addition, nanohardness at the V/IN718 interface was inhomogeneous as compared to that at the V/CpTi interface. Creep deformation behavior at the IN718 side was relatively higher than that at different regions on the CpTi side. The decreased plastic deformation or creep effect of the IMCs could be attributed to their higher hardness value. Compared to the base metals (CpTi and IN718), the IMCs exhibited a strain hardening effect. The calculated values of the creep stress exponent were found in the range of 1.51–3.52 and 2.52–4.15 in the V/CpTi and V/IN718 interfaces, respectively. Furthermore, the results indicated that the creep mechanism could have been due to diffusional creep and dislocation climb.

show abstract

Effect of heat input on microstructure and mechanical properties of pulsed laser welded joints in Ti6Al4V/Nb dissimilar alloys

Cited by 16 publications

References 24 publications

Laser Additive Manufacturing of TC4/AlSi12 Bimetallic Structure via Nb Interlayer

Laser Additive Manufacturing of TC4/AlSi12 Bimetallic Structure via Nb Interlayer

Dissimilar P-TIG welding between Inconel 718 and commercially pure Titanium using niobium interlayer

Investigating Nanoindentation Creep Behavior of Pulsed-TIG Welded Inconel 718 and Commercially Pure Titanium Using a Vanadium Interlayer

Contact Info

Product

Resources

About