Directional freeze method for TiAl-based alloy plate

Abstract

The continual casting directional solidification method for TiAl-base alloy plate comprises, putting TiAl alloy material bar 3 and dummy ingot 4 with rectangular intersection into the electromagnetic induction range of coil 6, galvanizing to coil 6 with single-phase alternating current with power of 75~100kW from electrical power for 20~25min; the alloy bar 3 and ingot 4 move downward with velocity of 0.01-0.05mm / min and get into the bottom crystallizer 8. This invention overcomes the limit to rectangular intersection blank and fits to press for high performance material in economy, science and national defense industry.

Description

Technical field: [0001] The invention relates to a continuous melting and casting directional solidification method. Background technique: [0002] The existing methods for directional solidification of TiAl-based alloys are combined with a circular cavity for melting and casting processing. Since the magnetic induction intensity distribution and metal melting temperature of the cold crucible of the circular cavity are relatively consistent in all directions, so The process conditions that need to be considered are relatively simple, but for relatively complex rectangular cross-section plates, melting and casting cannot be achieved through the existing melting and casting methods, because the directional solidification of the cold crucible is first faced with the heating and melting of the alloy and the electromagnetic force For the constrained forming problem, for electromagnetic melting and constrained forming in a cold crucible with a rectangular cross-section, compared w...

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Problems solved by technology

[0003] In view of the fact that the existing directional solidification method is not suitable for the processing of plates, and at the same time the existing directional solidification method is not suitable for the processing of TiAl-based alloy materials, the present invention provides a capacitive electromagnetic melting and constrained forming method that can obtain ingots with excellent performance The directional solidification method of TiAl-based alloy plates integrated with directional solidification, installs a cold crucible with the functions of constraining melting alloy and controlling magnetic field distribution in the electromagnetic constrained forming and directional solidification furnace with electromagnetic constrained forming and directional solidification functions, cold crucible The cross-section of the cavity of the cold crucible is rectangular, and an induction coil with 2 to 8 turns is fixed outside the cold crucible, and then a dummy ingot whose upper end is fixed to the upper feeding mechanism and a dummy ingot whose lower end is fixed to the lower drawing mechanism is installed in the cavity of the cold crucible. connected TiAl-based alloy material rod, the TiAl-based alloy material rod is arranged directly above the dummy ingot, and the ratio of the width W, length L, and height H of the cavity is 1:2~6:10~20. The crucible body of the cold crucible has six to eighteen slots that can ensure the uniform distribution of the magnetic field in the crucible. Vacuumize the electromagnetic constrained forming and directional solidification furnace to 0.005-0.1Pa, and then reverse Fill the argon gas to 2000-4000Pa. After the TiAl-based alloy rod and rectangular dummy ingot are fed into the magnetic field induction range of the coil, the coil is fed with single-phase alternating current, and the applied power of the power supply is 75-100kW. After staying for 20-25 minutes, the TiAl The base alloy rod and the rectangular dummy ingot move downward at a speed of 0.01-0.05mm / min, and the final rod enters the crystallizer set below it.

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