chanelink logo
CHANELINK
Italiano

Shanghai Photonics Corporation has made progress in laser welding of structural materials (Ni-28W-6Cr alloy) for new-generation molten salt reactors

188
2023-08-25 13:59:25
Vedi traduzione

Recently, Yang Shanglu, a researcher at the Laser Intelligent Manufacturing Technology Research and Development Center of Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, has made new progress in laser welding of the fourth-generation reactor-molten salt reactor structural material Ni-28W-6Cr nickel-based superalloy. 

The research team applied the high power fiber laser welding technology to Ni-28W-6Cr alloy for the first time, and analyzed the dynamic cracking behavior characteristics of the laser welding hot crack by using high speed camera technology, and clarified the cracking mechanism. 

The relevant research results are summarized as "Dynamic laser welding hot cracking behavior and mechanism of new structural material Ni-28W-6Cr alloy for molten. salt reactor "was published in the Journal of Materials Research and Technology.

Ni-28W-6Cr high temperature nickel base alloy is a new structural material designed for the new generation of high temperature molten salt reactor (> 850℃) in China, which has excellent high temperature resistance and corrosion resistance to molten salt. However, due to the high alloying level of the alloy, it has a very high sensitivity to welding hot cracks, which poses a great threat to the service safety of welded joints and structures. 

In order to improve the laser welding quality of Ni-28W-6Cr alloy and promote the application of nuclear energy engineering, it is urgent to study the cracking behavior and influencing factors of Ni-28W-6Cr high temperature nickel base alloy laser welding, and solve the problem of laser cracking by elucidating the cracking mechanism.

The dynamic crack behavior of Ni-28W-6Cr alloy laser welding was analyzed by using a 10,000-watt laser processing unit combined with high-speed imaging technology, and the relationship between the type, number, size, propagation behavior and laser power of the hot crack was obtained. 

The influencing factors of hot crack initiation and propagation (laser process parameters, element segregation, precipitated phase and stress, etc.) were clarified, and the mechanism of hot crack cracking in laser welding was elucidated. The work laid a foundation for the control of Ni-28W-6Cr alloy laser welding hot crack, the realization of alloy defect free laser welding, and promote the construction of a new generation of molten salt reactor.

This work is supported by the National Natural Science Foundation Youth Fund and the National Key Research and Development Program.

Figure 1: (a) Dynamic cracking behavior of Ni-28W-6Cr alloy during laser welding; (b) microstructure of Ni-28W-6Cr alloy during laser welding.

Figure 2 EBSD analysis results of Ni-28W-6Cr alloy laser welding hot crack: (a) solidification crack, (b) liquefaction crack.

Source: Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences

Raccomandazioni correlate

  • Laser communication is expected to completely change optical links

    Laser technology is becoming a game changer in the field of satellite communication (SATCOM), capable of creating ultra secure networks that can transmit large amounts of data at unprecedented speeds through satellite networks and constellations.With continuous progress, the industry is ready for growth and collaboration, seizing the untapped potential of disconnected populations. The ability to h...

    2023-09-20
    Vedi traduzione

  • Emerging laser technologies for precise manufacturing of multifunctional nanomaterials and nanostructures

    The use of photons to directly or indirectly drive chemical reactions has fundamentally changed the field of nanomaterial synthesis, leading to the emergence of new sustainable laser chemistry methods for manufacturing micro - and nanostructures. The incident laser radiation triggers complex interactions between chemical and physical processes at the interface between solid surfaces and liquid or ...

    2024-08-05
    Vedi traduzione

  • Toshiba has developed the world's highest precision 99.9% LiDAR technology

    Recently, Toshiba announced that in the field of LiDAR lidar for distance measurement, it has developed a technology that can track vehicles, people, and other objects with 99.9% accuracy, achieving the world's highest accuracy. And only using LiDAR to collect data can achieve 98.9% object recognition.In addition, the detection distance in rainstorm and dense fog environments has been increased by...

    2023-10-06
    Vedi traduzione

  • Breaking the production record! Laser and lithium achieve ammonia production under environmental conditions for the first time

    The application of laser technology has revolutionized the methods of nitrogen fixation, providing a new method for synthesizing ammonia under environmental conditions. Recently, researchers have used commercial carbon dioxide lasers for the first time to disrupt the nitrogen nitrogen triple bond, providing a new green alternative to the Haber Bosch process.It is reported that the international re...

    2023-10-16
    Vedi traduzione

  • Nokia and AT&T reach five-year agreement to accelerate fiber optic network upgrade

    Recently, Nokia announced a five-year agreement with AT&T. This agreement aims to fully support and accelerate AT&T's fiber network expansion and upgrade plans by deploying Nokia's Lightspan MF platform and Altiplano access controllers. This cooperation not only marks a deep optimization of the existing fiber optic network, but also heralds the early layout and application of the next ge...

    2024-09-12
    Vedi traduzione