chanelink logo
CHANELINK
English

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

368
2023-08-25 13:59:25
See translation

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

Related Recommendations

  • Researchers use machine learning to optimize high-power laser experiments

    High intensity and high repetition lasers rapidly and continuously emit powerful bursts of light, capable of emitting multiple times per second. Commercial fusion energy factories and advanced compact radiation sources are common examples of systems that rely on such laser systems. However, humans are a major limiting factor as their response time is insufficient to manage such rapid shooting syst...

    2024-05-24
    See translation

  • Blue laser enterprise NUBURU obtains $5.5 million bridge financing

    Recently, NUBURU, a supplier of high-power and high brightness industrial blue laser technology in the United States, announced that it has reached bridge loan agreements ("bridge loans" or "bridge financing") with existing and new institutional investors.The principal of this bridge financing is $5.5 million, aimed at providing funding for the company until it obtains long-term credit financing,...

    2023-11-23
    See translation

  • A review of research on residual stresses in carbon steel welding

    Researchers from the University of Witwatersrand in South Africa have reported a review of research on residual stresses in carbon steel welding: formation mechanisms, mitigation strategies, and advances in advanced post weld heat treatment technologies. The relevant paper titled "A comprehensive review of residual stresses in carbon steel welding: formation mechanisms, mitigation strategies, and ...

    04-12
    See translation

  • BOFA launches the latest generation of high-temperature 3D printing filtration technology

    BOFA has consolidated its position as a market leader in additive manufacturing of portable smoke and particle filtration systems with the latest generation of 3D PrintPRO technology designed specifically for high-temperature processes.3D PrintPRO HT focuses on the 230V market and can filter high-temperature particles, gases, and nanoparticles emitted during polymer processing in the printing room...

    2024-04-15
    See translation

  • Xi'an Institute of Optics and Fine Mechanics has made significant progress in the field of metasurface nonlinear photonics

    Recently, the Research Group of Nonlinear Photonics Technology and Application in the Transient Optics Research Room of Xi'an Institute of Optics and Mechanics, Chinese Academy of Sciences has made important progress in the field of super surface nonlinear photonics. Relevant research results were published in Laser&Photonics Reviews (IF=9.8), the top journal of the first district of the Chine...

    04-30
    See translation