Simulation of critical cooling rate and process conditions for metallic glasses in vertical type twin-roll casting

Critical cooling rates for producing metallic glasses were evaluated based on a calculated continuous cooling transformation (CCT) diagram. Temperature distributions of the melt in molten pool in the vertical type twin-roll casting (VTRC) process of metallic glasses were simulated, and cooling rates...

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Bibliographic Details
Published in:Transactions of Nonferrous Metals Society of China 2017-11, Vol.27 (11), p.2406-2414
Main Authors: PEI, Zhi-pu, JU, Dong-ying, LI, Xue
Format: Article
Language:English
Subjects:
critical cooling rate
metallic glass
simulation
twin-roll casting
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Summary:Critical cooling rates for producing metallic glasses were evaluated based on a calculated continuous cooling transformation (CCT) diagram. Temperature distributions of the melt in molten pool in the vertical type twin-roll casting (VTRC) process of metallic glasses were simulated, and cooling rates under different casting conditions were calculated with the simulated results. By comparing the results obtained by CCT diagrams and simulation, the possibility of producing metallic glasses by the VTRC method and influences of casting conditions on cooling rate were discussed. The results reveal that cooling rate with 3 or 4 orders of magnitude by the VTRC process can be attained in producing Mg-based metallic glasses, which is faster than the critical cooling rate calculated by the CCT diagram. One side pouring mode can improve the temperature distributions of casting pool. VTRC process has a good ability in continuous casting metallic glassy thin strips.
ISSN:1003-6326
DOI:10.1016/S1003-6326(17)60267-X