Obtaining and characterization of Ni-Ti/Ti-Mo joints welded by TIG process

Costa, Josiane Dantas; Sousa, Mikarla Baía de; Fook, Nathália Cristina Morais Lia; Alves, José Jaílson Nicácio; Araújo, Carlos José de; Prasad, Shiva; Campos, Ana Regina Nascimento; Santana, Renato Alexandre Costa de

doi:10.1016/j.vacuum.2016.08.016

Cited by 16 publications

(4 citation statements)

References 44 publications

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“…An Experiment Design (DOE) associated to response surface methodology (RSM) was used as an optimization tool. The use of these optimization techniques has increased in recent years in different areas of knowledge [1,[14][15][16][17]. A complete factorial design of two levels and three factors (2³) was used, with three replications at the center point and, therefore, a total of 11 experiments were conducted in this study, for a quantitative assessment of the influence of the parameters current (A), welding speed (S), powder feed rate (F) and dilution.…”

Section: Factorial Designmentioning

confidence: 99%

Study on influence of the PTA-P welding process parameters on corrosion behavior of Inconel 625 coatings

et al. 2019

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In the present work, PTA welding process was used to investigate the influence of welding parameters on the dilution, microhardness and corrosion resistance of Inconel 625 alloy coatings on the API 5L X70 grade steel. The electrochemical impedance spectroscopy (EIS) and linear potentiodynamic polarization (LPP) measurements were used to study the protection properties of the deposited layer when immersed in a 3.5% NaCl solution. The results of EIS and LPP have shown that the corrosion resistance results were more satisfactory for coatings with higher dilution index. The results also showed that the dilution values D (%)varied from 15.33% to 4.39% at the maximum (18.99 kJ/cm) and the minimum (8.34 kJ/cm) welding energy levels. The most relevant dilution value obtained was 4.39%.

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Section: Factorial Designmentioning

confidence: 99%

Study on influence of the PTA-P welding process parameters on corrosion behavior of Inconel 625 coatings

et al. 2019

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“…Table 5 shows the values obtained by the Tafel extrapolation method. Calculation of the corrosion current was based on the Stern-Geary equation 31,32 :…”

Section: Characterization Of the Alloysmentioning

confidence: 99%

Influence of Zirconium Percentage on Microhardness and Corrosion Resistance of Ti50 Ni50-xZrx Shape Memory Alloys

et al. 2019

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To obtain high temperature shape memory alloys of the lower cost Ni-Ti-X system, elements such as Hf and Zr are introduced to modify the thermal and mechanical properties of these alloys. This work studied the production and characterization of Ti 50 Ni 50-x Zr x alloys (x = 0, 5, 10 at.%) with the aim of improving their thermal, mechanical and corrosion resistance properties. In the resulting alloys, transformation of phase B2 into phase B19' occurred in a single stage. The addition of zirconium led to an increase of transformation temperatures, as well as the appearance of second phase particles in the grain boundaries of the matrix. The increase in zirconium percentage favored the increase of corrosion resistance from 520.23KΩ to 1007.30KΩ and of microhardness from 346HV to 543HV for the N0 and N10 alloys, respectively.

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“…32–34 Few researchers have explored FSW, µPAM, EBW, CDW, resistance welding, ultrasonic spot welding, GMAW, friction welding, and TIG welding of NiTinol SMA. 35–41 Similar to LBW, DPTIG is also capable of supplying lesser HI on thin sheets. 42 In this work, NiTinol is joined using minimal HI.…”

Section: Introductionmentioning

confidence: 99%

The effect of heat input on weld-bead geometry, mechanical, phase transformation temperature, and corrosion properties of autogenous double pulse TIG welded nitinol sheets

Manoj Samson,

Deepan Bharathi Kannan,

Shravan Kumar

2024

Proceedings of the Institution of Mechanical Engineers, Part E:

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This research aims to analyze the welding of 1 mm thick NiTinol sheets using an autogenous double pulse tungsten inert gas (DPTIG) welding process. The effect of heat input (HI) on bead geometry, microstructure, hardness, tensile strength, phase transformation temperature (PTT), and corrosion behavior was studied. The lower (111.25 J/mm), and higher (120.14 J/mm) HI produced an average grain size of 26 μm and 36 μm, respectively. The microstructure of the fusion zone (FZ) had coarser columnar grains with intermetallic phases such as Ni3Ti, and TiO2. The grain size in the FZ increased with the increase in HI. Sample P (111.25 J/mm) showed a higher hardness of 280.54 HV and tensile strength of 566 MPa due to a higher proportion of austenite phase (99.4%), the smaller grain size of 26 µm, a larger fraction of high angle grain boundary (HAGB) of 75.8%, and higher kernel average misorientation (KAM) value of 4.93. Compared to base metal (BM), sample P (111.25 J/mm), and sample S (120.14 J/mm) exhibited a reduction in tensile strength of 19.14% and 32.29%, respectively. The decline in hardness and tensile strength was attributed to the formation of intermetallic phases, a decrease in the Ti/Ni ratio, coarser grain formation, and a decrease in HAGB fraction and KAM values. The fractured tensile samples showed a mixed mode of fracture with dimples and cleavage facets. Compared to BM, Sample Q (118.05 J/mm) exhibited lesser variation in temperature hysteresis values for austenite and martensite temperatures, with a deviation of 0.4°C and 3.1°C, respectively. All the welded samples had better corrosion behavior than the BM due to a higher Ti/Ni ratio.

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Obtaining and characterization of Ni-Ti/Ti-Mo joints welded by TIG process

Cited by 16 publications

References 44 publications

Study on influence of the PTA-P welding process parameters on corrosion behavior of Inconel 625 coatings

Study on influence of the PTA-P welding process parameters on corrosion behavior of Inconel 625 coatings

Influence of Zirconium Percentage on Microhardness and Corrosion Resistance of Ti50 Ni50-xZrx Shape Memory Alloys

The effect of heat input on weld-bead geometry, mechanical, phase transformation temperature, and corrosion properties of autogenous double pulse TIG welded nitinol sheets

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