Welding and Joining of NiTi Shape Memory Alloys: A Review

Oliveira, J.P.; Miranda, Rosa Maria Mendes; Fernandes, Francisco Manuel Braz

doi:10.1016/j.pmatsci.2017.04.008

Cited by 285 publications

(83 citation statements)

References 269 publications

(497 reference statements)

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“…In the XRD analysis, the tested samples wire-cut from the IN-738 ingot was approximately 10 mm in width and 20 mm in length. Although the analyzed region varies with the 2θ angle, it changed not much when 2θ varied between 30 • and 80 • [34]. The fracture features of the cracked specimens were also inspected by a FESEM.…”

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

Liquation Cracking in the Heat-Affected Zone of IN738 Superalloy Weld

Chen

Shiue

et al. 2018

Metals

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Abstract:The main scope of this study investigated the occurrence of liquation cracking in the heat-affected zone (HAZ) of IN738 superalloy weld, IN738 is widely used in gas turbine blades in land-based power plants. Microstructural examinations showed considerable amounts of γ' uniformly precipitated in the γ matrix. Electron probe microanalysis (EPMA) maps showed the γ-γ' colonies were rich in Al and Ti, but lean in other alloy elements. Moreover, the metal carbides (MC), fine borides (M 3 B 2 and M 5 B 3 ), η-Ni 3 Ti, σ (Cr-Co) and lamellar Ni 7 Zr 2 intermetallic compounds could be found at the interdendritic boundaries. The fracture morphologies and the corresponding EPMA maps confirmed that the liquation cracking in the HAZ of the IN738 superalloy weld resulted from the presence of complex microconstituents at the interdendritic boundaries.

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Section: Materials and Experimental Proceduresmentioning

confidence: 99%

Liquation Cracking in the Heat-Affected Zone of IN738 Superalloy Weld

Chen

Shiue

et al. 2018

Metals

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“…To evaluate the effect of selected input factors on the output parameters, the signal-to-noise ratios and means for each factor were calculated [32][33][34]. The signalto-noise ratio and mean for the responses such as impact strength and hardness are presented in Table 3.…”

Section: Sn Ratio Analysismentioning

confidence: 99%

Investigation on TIG welding parameters of 2205 duplex stainless steel

Ravichandran¹,

Sait²,

Vignesh³

2022

Int. J. Automot. Mech. Eng.

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TIG welding process parameters were analysed for joining duplex stainless-steel plates. Signal to noise (SN) ratio and Analysis of Variance (ANOVA) analyses were applied for investigating the selected welding parameters. The selected parameters were current (A), gas flow rate (L/min) and speed (mm/min). The purpose of this work is to produce weld joints with maximum impact of strength and hardness. L9 orthogonal array was selected according to the aforementioned factors with three levels. The impact strength of the joints was found using the Izord impact testing machine and hardness of all joints was measured using the Brinell Hardness machine. From the SN ratio analysis, it was observed that for the high impact strength, the required welding current was 150 A, gas flow rate was 14 L/min and the welding speed was 210 mm/min while for high hardness, the welding current was 190 A, gas flow rate was 12 L/min and the welding speed was 175 mm/min. ANOVA analysis indicated that the gas flow rate was the most significant one for both impact strength and hardness of the joints.

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“…The use of shape memory alloys has increased in recent years, thanks to its functional properties such as shape memory and super flexibility [1].…”

Section: Introductionmentioning

confidence: 99%

“…Shape memory alloys have two main features: Super flexibility and shape memory effect. NiTi, which is the most widely used in these alloys, has high strength and ductility properties [1]. Shape memory alloys are capable of reversible thermoelastic phase conversion.…”

Section: Introductionmentioning

confidence: 99%

Microstructural Characterisations of Welded Shape Memory Alloys

Doğan

Sari

2019

Celal Bayar Üniversitesi Fen Bilimleri Dergisi

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Today, with the development of technology, different welding methods were applied for different alloys. In this work, changing of functional properties after using welding methods for NiTi alloy samples were aimed. However, two different welding methods were employed for the same alloy and results were compared to each other and commented on them. In the present study, samples were welded with TIG and Laser welding and their cross section of welded zone was examined. Then these samples were examined in optical microscope and SEM. The advantages and disadvantages of both welding methods were reported. The basic distinction of TIG and laser welded samples examined in microscope were the scale of HAZ (Heat Affected Zone) of TIG welded samples. Nevertheless, due to more thermal input was applied for materials in TIG welded parts, more molten materials were detected, or heat effects were attained in this practice. In laser welding, heat input was less, and this could be recognized from the observed micrographs. When SEM figures were investigated, While HAZ was obviously distinguished from border of welding bath and the base metal was been separated from HAZ too. The twin structures were not observed in optical microscope; for that reason, they were investigated in SEM to see these twins in laser welded area.

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Welding and Joining of NiTi Shape Memory Alloys: A Review

Cited by 285 publications

References 269 publications

Liquation Cracking in the Heat-Affected Zone of IN738 Superalloy Weld

Liquation Cracking in the Heat-Affected Zone of IN738 Superalloy Weld

Investigation on TIG welding parameters of 2205 duplex stainless steel

Microstructural Characterisations of Welded Shape Memory Alloys

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