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- W2085173722 abstract "Abstract The electron beam button melting (EBBM) test is used to determine the cleanness of alloys such as nickel-base superalloys and steels used for critical engineering applications. The oxide particles are concentrated into an area on the top surface of the button referred to as the raft. The factors affecting the formation of inclusion rafts in electron beam buttons have been investigated. Comparisons with the fluid flow in weld pools have led to the proposal that the direction of the surface flows in the molten EBBM pool may have a decisive effect on raft formation. Mathematical modelling of the fluid flow in the molten pool formed in EBBM indicated that thermocapillary (Marangoni) forces may be dominant and this viewpoint has been confirmed by EBBM trials with IN718 in which the surface flows were monitored by following the movement of Al 2 O 3 particles. It is proposed that the direction of these surface flows is determined by the sulphur content of the heat and that good rafts can be obtained with sulphur contents greater than 10 ppm." @default.
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- W2085173722 date "1993-12-01" @default.
- W2085173722 modified "2023-10-01" @default.
- W2085173722 title "Factors affecting raft formation in electron beam buttons" @default.
- W2085173722 cites W2063566534 @default.
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- W2085173722 doi "https://doi.org/10.1016/0921-5093(93)90247-c" @default.
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