Ultrasonic vibration assisted laser welding of nickel-based alloy and Austenite stainless steel

Zhou, Siyu; Ma, Guangyi; Wu, Dongjiang; Chai, Dongsheng; Lei, M.K.

doi:10.1016/j.jmapro.2017.12.023

Cited by 85 publications

(21 citation statements)

References 37 publications

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“…The variation in microhardness in the CMZ was attributed to the solidification heterogeneities, such as solidification type (cellular and cellular-dendritic) and grain sizes, interdendritic phase (MC-type carbide and eutectic Laves/γ) types and sizes, and residual stress and strain levels. The microhardness variation observed in the CMZ can also be influenced by the crystallographic orientation of its grains, as indicated by Zhou et al [58]. The intense nucleation of grains with different crystalline orientations in the TZ-S/C resulted in different mechanical properties of each grain.…”

Section: Mechanical Propertiesmentioning

confidence: 92%

Microstructural and Mechanical Characterization of the Transition Zone of 9%Ni Steel Cladded with Ni-Based Superalloy 625 by GTAW-HW

Farias

Filho

Azevedo

2018

Metals

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9%Ni steel was recently used for the first time in the field of injection unit (IU) for the injection of CO2 into oil wells. Because such steels are operated in H2S medium and are susceptible to sulfide stress cracking, their pipes are cladded with Ni-based superalloy 625 by using gas tungsten arc welding with a hot wire to prevent this phenomenon from occurring. The transition zone of substrate/clad can have high hardness and low toughness, and promote failure of the component during service; therefore, it is very important to know its characteristics. In this work, this transition zone was analyzed through optical and scanning electron microscopy with energy dispersive X-ray spectrometry and electron backscatter diffraction, as well as Vickers microhardness, shear and bend tests. Metallographic analysis identified type I and II boundaries with distinct chemical gradients, MC-type carbides, Laves/γ eutectics, peninsulas macrosegregation, crystallographic texture close to <100> in the clads, residual strain, and drop of microhardness across the transition zone. The clads were approved in the shear and bend tests. This work proposes a new type II boundary formation mechanism in dissimilar welds of steels that do not exhibit the allotropic transformation δ → γ during the welding thermal cycle and do not experience a change in the solidification mode.

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Section: Mechanical Propertiesmentioning

confidence: 92%

Microstructural and Mechanical Characterization of the Transition Zone of 9%Ni Steel Cladded with Ni-Based Superalloy 625 by GTAW-HW

Farias

Filho

Azevedo

2018

Metals

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“…On the other hand, full control of mechanical vibrations is only possible when they are introduced by a well-tested and rigidly mounted vibrating system [2,9,[13][14][15][18][19][20] or modulation of the electric arc [21][22][23] or laser beam [3]. The improvement of structural features and mechanical properties is obtained in various zones of welds or coatings, i.e., in the weld itself and in the heat-affected zone.…”

Section: Introductionmentioning

confidence: 99%

A Novel Method of Supporting the Laser Welding Process with Mechanical Acoustic Vibrations

et al. 2020

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The research described in this article presents a new contactless method of introducing mechanical vibrations into the base material during CO2 laser welding of low-carbon steel. The experimental procedure boiled down to subjecting a P235GH steel pipe with a 60 mm diameter, 3.2 mm wall thickness and 500 mm length to acoustic signals with a resonant frequency during the welding process. Acoustic vibrations with a frequency of 1385, 110 and 50 Hz were introduced into the pipe along the axis and transversely from the outer surface. The obtained welds were then subjected to structural tests and Vickers hardness measurements. The results of comparative tests show the impact of such introduced vibrations on the granular structure of the welds, as well as on their microhardness in specific areas, such as the face, penetration depth and the heat-affected zone. The effectiveness of the proposed method of introducing vibrations in the scope of grain size and shape as well as changes in the hardness distribution in the obtained welds is demonstrated.

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“…Nickel alloys with an addition of about 20% chromium show high corrosion resistance and high strength at elevated temperatures, so they are commonly used for high-temperature applications and in corrosive environments, as example for fan blades in turbines or for parts in chemical plants [1]. There are several trade names for this material group like Inconel, Chronin or Nicrofer.…”

Section: Introductionmentioning

confidence: 99%

“…Segregation is likely to occur due to a high amount of alloying elements. Those can form lately solidifying phases between the primary grains, and effect hot cracking [1]. In addition, segregated alloying elements are missing in the residual material, which changes its properties like corrosion resistance in the case of chromium [2].…”

Section: Introductionmentioning

confidence: 99%

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Influence of Ultrasound on Pore and Crack Formation in Laser Beam Welding of Nickel-Base Alloy Round Bars

Grajczak

Nowroth

Nothdurft

et al. 2020

Metals

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Welding by laser beam is a method for creating deep and narrow welds with low influence on the surrounding material. Nevertheless, the microstructure and mechanical properties change, and highly alloyed materials are prone to segregation. A new promising approach for minimizing segregation and its effects like hot cracks is introducing ultrasonic excitation into the specimen. The following investigations are about the effects of different ultrasonic amplitudes (2/4/6 µm) and different positions of the weld pool in the resonant vibration distribution (antinode, centered, and node position) for bead on plate welds on 2.4856 nickel alloy round bars (30 mm diameter) with a laser beam power of 6 kW. The weld is evaluated by visual inspection and metallographic cross sections. The experiments reveal specific mechanisms of interaction between melt and different positions regarding to the vibration shape, which influence weld shape, microstructure, segregation, cracks and pores. Welding with ultrasonic excitation in antinode position improves the welding results.

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Ultrasonic vibration assisted laser welding of nickel-based alloy and Austenite stainless steel

Cited by 85 publications

References 37 publications

Microstructural and Mechanical Characterization of the Transition Zone of 9%Ni Steel Cladded with Ni-Based Superalloy 625 by GTAW-HW

Microstructural and Mechanical Characterization of the Transition Zone of 9%Ni Steel Cladded with Ni-Based Superalloy 625 by GTAW-HW

A Novel Method of Supporting the Laser Welding Process with Mechanical Acoustic Vibrations

Influence of Ultrasound on Pore and Crack Formation in Laser Beam Welding of Nickel-Base Alloy Round Bars

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