Effect of welding parameters on functionality of dissimilar laser-welded NiTi superelastic (SE) to shape memory effect (SME) wires

Mehrpouya, Mehrshad; Gisario, Annamaria; Broggiato, G. B.; Puopolo, M.; Vesco, Silvia; Barletta, Massimiliano

doi:10.1007/s00170-019-03514-7

Cited by 25 publications

(22 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Sci. 2019, 9, x FOR PEER REVIEW 4 of 12 Residual stress is always present in products printed by SLM [9,10], as presented in Figure 4. Because new layers are printed on other solidified layers, flake behavior is the result of an accumulative process.…”

Section: Deformation In the Selective Laser Melting (Slm)mentioning

confidence: 99%

“…However, large differences in the melting temperatures, thermal conductivities, and thermal expansions of steel and aluminum, as well as low solubility, makes it quite difficult to join them. A variety of methods have been applied to join dissimilar materials, such as mechanical assembling (e.g., riveting, clinching, screwing) and heat joining (e.g., friction stir welding [1,2], arc welding [3,4], laser welding [5][6][7][8][9], hot-dip aluminizing [10]).…”

Section: Introductionmentioning

confidence: 99%

“…Hybrid parts manufactured by selective laser melting were investigated [12]. The concept of multi-material fabrication by SLM has been reported in the literature [8][9]; however, these products were printed by physically mixing powders before layering. Figure 1.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Applying Selective Laser Melting to Join Al and Fe: An Investigation of Dissimilar Materials

2019

View full text Add to dashboard Cite

Combining aluminum and steel is a major goal of automobile manufacturers and other industries because the hybrid material reduces the weight of components. However, differences in chemical properties, thermal expansion, and physical characteristics of aluminum and steel are barriers to achieving this goal. In this article, selective laser melting (SLM), which is widely used in industrial fields, was applied to join dissimilar materials by printing aluminum on a steel substrate. Defects of joining during the SLM process, characteristics of the intermetallic reaction layer, and the effects of the process parameters were investigated. The analysis indicates that flake behavior could affect the quality of joining. The phases of the intermetallic layer found in this study were in agreement with other research, but the morphology of the layer was much different. A formula to estimate the join quality in terms of density energy is proposed. The results indicate that the SLM process is a promising method to manufacture a hybrid material.

show abstract

Section: Deformation In the Selective Laser Melting (Slm)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Applying Selective Laser Melting to Join Al and Fe: An Investigation of Dissimilar Materials

2019

View full text Add to dashboard Cite

show abstract

“…Figure 5 reports the results of the DSC tests on laser-welded NiTi–NiTiCu wires. The DSC curves show the phase transformation from the martensite phase (lower temperature) to the austenite phase (higher temperature) during the heating process and reversely from austenite to martensite in the cooling process (Mehrpouya et al, 2019c-d). The austenite phase includes austenite start (A S ) and austenite finish (A f ) in the heating curve, and the martensite phase includes martensite finish (M f ) and martensite start (M S ) in the cooling curve.…”

Section: Resultsmentioning

confidence: 99%

Investigation on the functionality of laser-welded NiTi to NiTiCu shape memory wires

Mehrpouya

Gisario

Barletta

et al. 2020

Journal of Intelligent Material Systems and Structures

Self Cite

View full text Add to dashboard Cite

NiTi shape memory wires are widely used in several markets, mainly for medical and aerospace applications, due to their excellent properties including superelasticity and shape memory effect. The combination of NiTi alloys with other alloys can provide high flexibility in the design of various smart structures. Nevertheless, the joining of NiTi alloys is really challenging because of the effect of thermal history on the functionality of welded joints. In fact, the temperature can change the microstructure and the balance of the material composition in the welding area, and, consequently, it leads to some alterations in the transformation temperature of the welded zone. The present study reports the effect of laser parameters, namely, laser power and scan speed, on the functionality of laser-welded NiTi to NiTiCu wires. The experimental findings allowed us to identify the best operational windows of the laser parameters, stating welding by high-power diode laser as an extremely promising technique in joining of dissimilar NiTi wires.

show abstract

“…Normally, when the working temperature of the Ni-Ti alloy is lower than transformation temperature, it will exhibit super-elasticity; otherwise, it will exhibit shape memory effect. The integration of Ni-Ti alloys with different shape memory properties should greatly increase the exibility for engineering applications [10][11][12][13]. Researchers [12] proposed a novel shape memory alloy actuator that contained two different material compositions in one monolithic piece of actuator wire.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Integrated Ni-Ti Alloys Possessing Both Super-elastic and Shape Memory Properties by Laser Powder Bed Fusion

Shen

2021

Preprint

View full text Add to dashboard Cite

Purpose: Integrated Ni-Ti alloys possessing both super-elastic (SE) properties and shape memory effects (SMEs) greatly increase the flexibility of designing complex systems and have broad application prospects. However, existing research mainly focuses on connecting ready-made SE parts and SME parts though welding. Method: In this paper, laser powder bed fusion (LPBF) was used to fabricate integrated Ni-Ti alloys. First, SE parts with high relative density were fabricated with a Ni-rich powder. Then, different process parameters were used to fabricate the SME parts with a Ti-rich powder based on the SE parts. The integrated component with the best mechanical properties herein was selected. Metallographic analysis, energy dispersive X-ray spectroscopy, differential scanning calorimetry and micro-hardness analyses were carried out for this sample. Findings: The results show that the integrated component possessed both SE and SME properties at room temperature. Moreover, at the junction of the two materials, the grains were continuous and complete, which indicates that the joint had good quality. Originality: Our work confirms that LPBF is a feasible method to fabricate integrated Ni-Ti alloys possessing both SE and SME properties.

show abstract

Effect of welding parameters on functionality of dissimilar laser-welded NiTi superelastic (SE) to shape memory effect (SME) wires

Cited by 25 publications

References 29 publications

Applying Selective Laser Melting to Join Al and Fe: An Investigation of Dissimilar Materials

Applying Selective Laser Melting to Join Al and Fe: An Investigation of Dissimilar Materials

Investigation on the functionality of laser-welded NiTi to NiTiCu shape memory wires

Fabrication of Integrated Ni-Ti Alloys Possessing Both Super-elastic and Shape Memory Properties by Laser Powder Bed Fusion

Contact Info

Product

Resources

About

Effect of welding parameters on functionality of dissimilar laser-welded NiTi superelastic (SE) to shape memory effect (SME) wires

Cited by 25 publications

References 29 publications

Applying Selective Laser Melting to Join Al and Fe: An Investigation of Dissimilar Materials

Applying Selective Laser Melting to Join Al and Fe: An Investigation of Dissimilar Materials

Investigation on the functionality of laser-welded NiTi to NiTiCu shape memory wires

Fabrication of Integrated Ni-Ti&nbsp;Alloys Possessing Both Super-elastic and Shape Memory Properties by Laser Powder Bed Fusion

Contact Info

Product

Resources

About

Fabrication of Integrated Ni-Ti Alloys Possessing Both Super-elastic and Shape Memory Properties by Laser Powder Bed Fusion