Microstructure and mechanical properties of ultrasonic pulse frequency tungsten inert gas welded Ti-22Al-25Nb (at.%) alloy butt joint

Shao, Liping; Wu, Sujuan; Datye, Amit; Zhao, Haitao; Petterson, Miles; Peng, Wenya

doi:10.1016/j.jmatprotec.2018.03.018

Cited by 13 publications

(3 citation statements)

References 18 publications

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“…Different types of welding arc have a significate influence on the microstructure and mechanical properties of welding seam. Ultrasonic pulsed frequency [ 36 ] and low‐frequency arc [ 37 ] were demonstrated to improve the quality of butt joint of titanium alloy. However, the research about the effect of different arc types on the titanium WAAM deposits was less.…”

Section: Resultsmentioning

confidence: 99%

Effects of Trace Boron Addition and Different Arc Types on Microstructure and Mechanical Properties of TC11/TC17 Dual Alloy Fabricated by Wire Arc Additive Manufacturing

et al. 2022

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Wire arc additive manufacturing (WAAM) provides an efficient and low‐cost potential for manufacturing TC11/TC17 dual titanium alloy. In this work, six deposition samples were fabricated for the test of microstructure and mechanical properties by the combination of trace boron addition and different arc types (direct current (DC), high frequency pulsed current (HC), low frequency pulsed current (LC)). Results show that the epitaxial growth β columnar grains were formed except for the combination of low frequency pulsed current and trace boron addition (LCB). A special microstructure of coarser α phases surrounding thin α phases was formed by the effect of LC arc or trace boron addition. Some TiB particles exhibited a specific orientation relationship with surrounding α phases, but not all: (0001)α||(001)TiB and <11‐20>α||[010]TiB. About mechanical properties, the elongation decreased with trace boron addition, and comprehensive mechanical properties of LC method was better than that of DC or HC methods whether it contained trace boron or not, with tensile strength of 1057 MPa and elongation of 14.4% in the longitudinal direction. Meanwhile, the strength of LCB group is highest than that of other groups, which is caused by the refined β grains and the uniform distribution of TiB particles.

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Section: Resultsmentioning

confidence: 99%

Effects of Trace Boron Addition and Different Arc Types on Microstructure and Mechanical Properties of TC11/TC17 Dual Alloy Fabricated by Wire Arc Additive Manufacturing

et al. 2022

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“…But this does not mean that simply increasing the pulse frequency can always refine the grains, and too high welding pulse frequencies will cause the weld structure deterioration. Shao et al [ 32 ], reported that too high a pulse frequency reduced the mechanical properties of the welded joint. Because the effect of the pulse current is too strong in the molten pool at a higher welding frequency.…”

Section: Resultsmentioning

confidence: 99%

Microstructure and Mechanical Properties of Fe-36Ni and 304L Dissimilar Alloy Lap Joints by Pulsed Gas Tungsten Arc Welding

Wang

Shen

et al. 2020

Materials

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High-quality joining of dissimilar alloys between Fe-36Ni alloy and 304L stainless steel is essential in the manufacturing of LNG tanker. In this study, lap joints of Fe-36Ni and 304L dissimilar alloys were fabricated by a pulsed gas tungsten arc welding (P-GTAW) process. The effects of low-frequency pulse on the appearance, microstructure and mechanical properties of the Fe-36Ni/304L lap joints was investigated. With the increase of frequency, the feature sizes of α (the transition angle of the upper surface of Fe-36Ni to the surface of the weld bead) and R (shortest distance between weld root and weld surface) exhibited downtrend and uptrend, respectively, while La (the maximum weld width of lower sheet) and P (the maximum weld penetration of lower sheet) changed in a smaller range. Fusion zone (FZ) is mainly composed of γ phase and M23C6 during solidification, and M23C6 particles are distributed on the grain boundaries of the cells, which reduced the mechanical properties of joint. The average hardness between 110 HV1 and 136 HV1 is lower than that of the base metals. Fractures of all joints located at the Fe-36Ni side near the weld, and a dimple fracture in all samples indicated a ductile fracture. This study found that the heat input values remain 198.86 J mm−1 and increased pulse frequency can improve the maximum tensile force. The average maximum tensile force of the lap weld is 11.95 kN when pulsed frequency is 15 Hz.

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“…There is also a significant activation of the technological environment, which ultimately leads to a significant increase in the performance of the taps. [1][2][3][4][5][6][7][8]…”

Section: Introductionmentioning

confidence: 99%

Study on the Ultrasonic Vibration Impact on the Performance of Taps when Thread Cutting in Workpieces Made of Difficult-to-Machine Materials

Golovkin

Batishcheva

Papshev

2022

KEM

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Materials with high mechanical properties are increasingly used in modern mechanical engineering in order to enhance the performance and service life of critical parts. Since these are difficult-to-machine materials, serious problems can arise due to low tool life or even with its breakage during mechanical processing. The greatest difficulties are connected with the processing of small-diameter holes, since, for example, breakage of drills or taps occurs when drilling and tapping. It should also be noted that when threading in workpieces made of difficult-to-machine materials, the cutting teeth of the taps are chipped. One of the possible solutions to this problem is the use of physicochemical processing methods, in particular, the transmission of forced ultrasonic oscillations to the tap.

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Microstructure and mechanical properties of ultrasonic pulse frequency tungsten inert gas welded Ti-22Al-25Nb (at.%) alloy butt joint

Cited by 13 publications

References 18 publications

Effects of Trace Boron Addition and Different Arc Types on Microstructure and Mechanical Properties of TC11/TC17 Dual Alloy Fabricated by Wire Arc Additive Manufacturing

Effects of Trace Boron Addition and Different Arc Types on Microstructure and Mechanical Properties of TC11/TC17 Dual Alloy Fabricated by Wire Arc Additive Manufacturing

Microstructure and Mechanical Properties of Fe-36Ni and 304L Dissimilar Alloy Lap Joints by Pulsed Gas Tungsten Arc Welding

Study on the Ultrasonic Vibration Impact on the Performance of Taps when Thread Cutting in Workpieces Made of Difficult-to-Machine Materials

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