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 A method for directional solidification of a TiAl-based alloy plate integrated with directional solidification, in which a cold crucible 5 with the functions of constraining molten alloy and controlling the distribution of a magnetic field is installed in the electromagnetic constrained forming and directional solidification furnace 7 with functions of electromagnetic constrained forming and directional solidification, The cross section of the cavity 5-1-1 of the cold crucible 5 is rectangular, and an induction coil 6 with 2 to 8 turns is fixed outside the cold crucible 5, and an upper end and a The dummy ingot 4 fixedly connected to the upper feeding mechanism 1 and the TiAl-based alloy material rod 3 whose lower end is fixedly connected to the lower drawing mechanism 2, the TiAl-based alloy material rod 3 is arranged directly above the dummy ingot 4, and the cavity 5-1 The ratio of the width W, length L, and height H of -1 is 1:2~6:10~20, and there is a slit on the crucible body 5-1 of the cold crucible 5 to ensure that the magnetic field in the crucible is evenly distributed 5-6. Vacuumize the electromagnetic constrained forming and directional solidification furnace 7 to 0.005-0.1Pa, then reverse-fill argon to 2000-4000Pa, and feed the TiAl-based alloy rod 3 and rectangular dummy ingot 4 into the coil 6 After the magnetic field induction range, the coil 6 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-based alloy material rod 3 and the rectangular dummy ingot 4 move towards the Move down, and make the final rod enter the crystallizer 8 below it.

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