Microstructural analysis of friction welded joints in TiNi alloy

Shinoda, Takeshi; Owa, Tomonobu; Magula, V.

doi:10.1080/09507119909447361

Cited by 12 publications

(6 citation statements)

References 8 publications

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“…There is a clear distinction between TMAZ and HAZ. Similar observations have been reported by Shinoda et al (1992), Shinoda et al (1999). The average grain size of the weld was 15 ± 3 µm.…”

Section: Microstructure Of Weldssupporting

confidence: 90%

“…They observed that the microstructure was the B2 structure in the as-welded condition, and the microstructure changed to B19′ and R phases after post-weld heat treatment. Ni 3 Ti and NiTi 2 precipitates were observed in the base metal, and these precipitates disappeared in the friction welded samples due to dissolution (Shinoda et al, 1999).…”

Section: Introductionmentioning

confidence: 96%

“…They also reported that the ultimate tensile strength (UTS) of friction welded joints exhibited similar strength of the base metal when heat treatment was performed after welding (Shinoda et al, 1991;Shinoda et al, 1992). In another study, Shinoda et al (1999) investigated the microstructural analysis of rotary friction welded NiTi alloy. They observed that the microstructure was the B2 structure in the as-welded condition, and the microstructure changed to B19′ and R phases after post-weld heat treatment.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure and Mechanical Property Correlation Between Rotary Friction Welded Nitinol–Nitinol Joints

et al. 2021

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In the present study, a rotary friction process was used to join nitinol in a similar welding combination. Macro- and microstructure characteristics of the weld zone were compared with adjacent zones and the base metal. The hardness and tensile properties of the joints were evaluated, and the results were discussed in relation to the weld microstructure. The weld macrostructure revealed a uniform flash around the circumference of the weld. The optical microstructure of the welded sample revealed fine recrystallized grains at the weld interface due to heavy deformation followed by dynamic recrystallization. The phase transformation behavior of the base metal and welded samples was studied by using a differential scanning calorimeter (DSC). The drift in phase transformation temperatures after rotary friction welding may be attributed to fine grain formation at the weld interface. Friction welded samples exhibited improved yield strength and hardness values compared to the base metal due to grain refinement at the weld interface.

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Section: Microstructure Of Weldssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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Microstructure and Mechanical Property Correlation Between Rotary Friction Welded Nitinol–Nitinol Joints

et al. 2021

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“…Increasing the applied pressure, the grain size in the dynamically recrystallized zone decreased. The UTS of the welded joints was similar to that of the base material, but with a lower elongation to fracture [66,68]. Post-weld heat treatments were seen to improve the functional properties of the welds, which were then similar to those of the base material.…”

Section: Friction Weldingmentioning

confidence: 99%

Welding and Joining of NiTi Shape Memory Alloys: A Review

Oliveira

Miranda

Fernandes

2017

Progress in Materials Science

285

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“…Solid-state welding methods can minimize the degradation of mechanical and functional properties observed in traditional fusion-based methods. Frictionbased welding methods involve the formation of HAZ and thermo-mechanically affected zone [19,20]. Furthermore, friction welding is limited to geometries with rotational symmetry and has seen little research in welding of nitinol wires.…”

Section: Introductionmentioning

confidence: 99%

High strength impact welding of NiTi and stainless steel wires

Li¹,

Panton²,

Mao³

et al. 2020

Smart Mater. Struct.

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This work demonstrates the use of a solid-state microwelding process to create very high strength welds between superelastic NiTi and themselves as well as stainless steel (SS) wires. Vaporizing foil actuator welding (VFAW) uses the pressure from a vaporized metal foil to impact weld the wires by driving them into one another. The small scale nature of this explosive-like process allows its use in factories. Advanced techniques were used to examine the structures and properties of the welds that were created. The NiTi/SS welds had the typical wavy interface of ideal impact welds, with no thermally induced defects such as chemical segregation near the interface or brittle intermetallic formation. These latter two are significant issues in traditional fusion based methods. Microhardness tests show that the NiTi/NiTi and NiTi/SS weld interfaces were locally strengthened compared to the softening of other welding processes. Lap shear tests show that NiTi/SS welds made by VFAW present much higher joint efficiency (near 100%) compared to less than 60% for other traditional joining technologies. Tensile cycling of both the NiTi/NiTi and the NiTi/SS welds shows similar stabilization of the pseudoelastic curves as the NiTi base metal. The irrecoverable strains of the NiTi/NiTi welds and NiTi/SS welds after cycling were comparable to that in the NiTi base metal. The unparalleled performance of these high-strength solid-state similar and dissimilar welds of nitinol is a solution to the increasing demands of applications in various industrial fields including the medical, aerospace and electronic sectors.

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Microstructural analysis of friction welded joints in TiNi alloy

Cited by 12 publications

References 8 publications

Microstructure and Mechanical Property Correlation Between Rotary Friction Welded Nitinol–Nitinol Joints

Microstructure and Mechanical Property Correlation Between Rotary Friction Welded Nitinol–Nitinol Joints

Welding and Joining of NiTi Shape Memory Alloys: A Review

High strength impact welding of NiTi and stainless steel wires

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