English

Shanghai Optics and Machinery Institute has made new progress in laser welding of new high-temperature nickel based alloys

1038
2023-09-01 14:42:55
See translation

Recently, the research team of Yang Shanglu from the Laser Intelligent Manufacturing Technology R&D Center of the Chinese Academy of Sciences Shanghai Institute of Optics and Precision Machinery has made new progress in laser welding of new structural materials for high-temperature molten salts. The research team used a high-power laser for the first time to achieve defect free welding of nickel based high-temperature alloys, and conducted a systematic evaluation of the microstructure and mechanical properties of the welded joints.

The relevant research results were published in the Materials Characterization under the title "Laser welding of GH3539 alloy for molten salt reactor: processing optimization, microstructure and mechanical properties".

GH3539 alloy is a new type of high-temperature nickel based alloy independently developed in China, with excellent high-temperature mechanical and corrosion resistance, suitable for ultra-high temperature (≥ 850 ℃) molten salt environments. However, higher alloying results in higher welding crack sensitivity of the alloy.

In order to achieve efficient and high-quality laser welding of alloy structural components, the team used fiber laser welding technology to study the effects of different welding process parameters on the welding formation of GH3539 alloy with a thickness of 3mm. Through process optimization, the generation of welding cracks, pores, and other defects was suppressed. For the first time, defect free welding formation of GH3539 alloy was achieved. Based on this, the microstructure and mechanical properties at room temperature/high temperature of the welded joint were systematically evaluated; And analyzed the tensile fracture behavior of laser welded joints, elucidated the fracture mode of alloy laser welded joints. This work has laid the foundation for promoting the development of laser welding technology and the application of GH3539 nickel based high-temperature alloy.

Figure 1: (a) Welding cross-section of GH3539 laser welded joint; (b) Microstructure of GH3539 alloy; (c) XRD results of GH3539 alloy laser welded joints; (d) Hardness distribution of GH3539 alloy laser welded joints; (e) Engineering stress-strain curves of base metal and welded joints at different temperatures; (f) Average elongation of base metal and welded joints at different temperatures

Source: Shanghai Institute of Optics and Mechanics

Related Recommendations
  • Researchers have discovered new multiphoton effects in quantum interference of light

    An international research team from Leibniz University in Hanover and Strathclyde University in Glasgow overturned the previous hypothesis about the influence of multiphoton components in the thermal field and the interference effect of parameterized single photons. The journal Physical Review Letters published the team's research."We have demonstrated through experiments that the interference eff...

    2024-01-24
    See translation
  • Reverse Modeling of 3D Scanning Reading in Hong Kong: Production Innovation in the Digital Era

    In the wave of the digital age, Hong Kong, as an international business center, constantly explores the application of new technologies in the manufacturing industry. Among them, 3D scanning and reverse modeling technology is emerging, bringing a new production innovation to the manufacturing industry. This article will explore the application of 3D scanning and reverse modeling in Hong Kong, as w...

    2024-03-30
    See translation
  • Research on LiDAR at the University of Electronic Science and Technology of China, published in Nature

    The team from the School of Information and Communication Engineering at the University of Electronic Science and Technology of China has proposed for the first time a laser radar instrument based on the dispersion Fourier transform method, forming a new demodulation mechanism. This instrument breaks through the cross limitations of measurement speed, accuracy, and distance, and has unique advanta...

    2024-06-22
    See translation
  • LiDAR solutions provider Cepton acquired by KOITO

    On July 29, 2024, Cepton, a provider of high-performance LiDAR solutions, announced the signing of the final agreement for its acquisition, making it the acquiring company's subsidiary in the United States.Image source: CeptonAccording to the agreement, the acquirer is the internationally renowned automotive lighting giant KOITO, which was established in 1915 and has a history of over a hundred ye...

    2024-08-01
    See translation
  • Fiber coupled single photon source meets the requirements of quantum computing

    Due to the ability of quantum computers to crack many encryption methods used in current communication systems, the security of our current communication systems is facing threats. To address this crisis, scientists are developing quantum communication systems that utilize quantum mechanics to provide stronger security. A key component of these systems is the single photon source. In order for qua...

    10-27
    See translation