English

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

1004
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
  • Laser based ultra precision gas measurement technology

    Laser gas analysis can achieve high sensitivity and selectivity in gas detection. The multi-component capability and wide dynamic range of this detection method help analyze gas mixtures with a wide concentration range. Due to the fact that this method does not require sample preparation or pre concentration, it is easy to adopt in the laboratory or industry.Gas analysis is crucial for determining...

    2024-01-03
    See translation
  • University of California, Los Angeles Joins the American High Power Laser Facility Alliance

    The University of California, Los Angeles is joining LaserNetUS, a high-power laser facility alliance established by the Department of Energy, aimed at advancing laser plasma science.Unique facilities are located in universities and national laboratories across the United States and Canada, providing a wide range of opportunities for researchers and students.The Phoenix Laser Laboratory at the Uni...

    2023-09-15
    See translation
  • Revealing the essence of optical vortices: a step towards understanding the interaction between light and matter

    In a groundbreaking scientific study published in Volume 13 of the Scientific Report, researchers reported on the results of Young's double slit interference experiment using oscillating vortex radiation under a photon counting system. The experiment involves using a spiral oscillator to emit second harmonic radiation in the ultraviolet range. Using an ultra narrow bandpass filter in the low curre...

    2023-12-29
    See translation
  • New technology can efficiently heal cracks in nickel based high-temperature alloys manufactured by laser additive manufacturing

    Recently, Professor Zhu Qiang's team from the Department of Mechanical and Energy Engineering at Southern University of Science and Technology published their latest research findings in the Journal of Materials Science. The research team has proposed a new process for liquid induced healing (LIH) laser additive manufacturing of cracks. By controlling micro remelting at grain boundaries to introdu...

    2024-03-15
    See translation
  • Phil Energy from South Korea wins mysterious order from European battery manufacturer

    Recently, Phil Energy, a South Korean secondary battery equipment manufacturer, successfully won an order from a European battery manufacturer to manufacture the next generation 46 series cylindrical battery manufacturing equipment. At present, both parties have signed a supply agreement for this cooperation, but have not disclosed the customer name and order size to the public. It is understood...

    2024-07-25
    See translation