Method for improving isometric crystal rate of casting blanks through two-phase competition in peritectic alloy

An equiaxed crystal ratio and alloy technology, which is applied in the field of metal solidification structure growth process control, can solve the problems of not finding complete relevant literature, etc., to improve the solidification structure and internal quality, increase the equiaxed crystal ratio, and reduce the internal quality. Effect

Inactive Publication Date: 2013-01-30
SHANGHAI UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

Although peritectic reactions occur during solidification of several alloys with important industrial applications, knowledge of the peritectic phase transformation process is rather limited

Method used

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  • Method for improving isometric crystal rate of casting blanks through two-phase competition in peritectic alloy
  • Method for improving isometric crystal rate of casting blanks through two-phase competition in peritectic alloy
  • Method for improving isometric crystal rate of casting blanks through two-phase competition in peritectic alloy

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Experimental program
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Embodiment 1

[0026] In this embodiment, Fe-Ni, a typical peritectic alloy, is selected as the model alloy for research.

[0027] The concrete processing steps of the present embodiment are as follows:

[0028] 1) Vacuum arc melting alloy: melting Fe-Ni alloy. First use electric arc to melt the raw material into a liquid state, and then turn on magnetic stirring to make the alloy composition uniform while continuing to smelt, and the magnetic stirring current is about 0-8A. Melt and stir the alloy repeatedly for 3-5 times.

[0029] 2) Preparation of thin strips by vacuum spray casting: figure 2 (a) Schematic diagram of the experimental equipment for electromagnetic induction melting and spray casting. The main experimental process is to use vacuum electromagnetic induction to melt the master alloy in the glass tube. After the alloy is melted evenly, a certain air pressure is applied to the alloy melt. Alloy strip. Design of spray-casting copper mold: Make a 1.0mm cuboid cavity on the ...

Embodiment 2

[0034] In this embodiment, Fe-Mn peritectic alloy is selected for research.

[0035] The concrete processing steps of the present embodiment are as follows:

[0036] 1) Vacuum arc melting alloy: melting Fe-Mn alloy.

[0037] 2) Preparation of thin strips by vacuum suction casting: figure 2 (b) is a schematic diagram of the experimental equipment for electromagnetic induction melting and spray casting. The main experimental process is to transfer the melted alloy to the casting crucible. Arc ignition smelting, when the alloy is completely melted, the arc ignition current is appropriately increased, so that the alloy liquid is cast into the mold along the guide tube to form; when the alloy thin strip is cooled to room temperature, the sample is removed.

[0038] 3) The main procedures of metallographic sample preparation are: sampling - embedding - polishing - polishing - etching, etc. Use 5% nitric acid alcohol solution as corrosion solution.

[0039] 4) Observation of mi...

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Abstract

The invention relates to a method for improving isometric crystal rate of casting blanks through two-phase competition in peritectic alloy. By means of the method, the isometric crystal proportion of the casting blanks is improved by utilizing two-phase competition during peritectic alloy solidification, and the quality of the casting blanks is improved. The peritectic system alloy Fe-Ni and Fe-Mn alloy serve as the objects, and the method for improving isometric crystal rate in the two-phase competition in the peritectic alloy under (inferior) fast sodification condition is provided. The method comprises the following processing steps: a) adopting a vacuum arc furnace to melt Fe-Ni and Fe-Mn alloy; b) preparing a thin belt through a vacuum spraying method, wherein the thickness of the thin belt is 2.0mm; c) adopting 5% of natal and Oberhofers corrosive liquid to corrode metallographic structures; and d) preparing microscopic structures, wherein the observation part of a sample is a cross section of the thin belt. By means of the method for improving the isometric crystal rate of casting blanks through two-phase competition in peritectic alloy, inner quality of the blanks can be improved, segregation is reduced, inner quality of other peritectic alloy steel is improved, the isometric crystal rate of solidification structures of the blanks is improved, and the quality of the casting blanks is improved.

Description

technical field [0001] The invention relates to a method for increasing the equiaxed crystal ratio of a slab by utilizing two-phase competition in a peritectic alloy. The invention belongs to the field of process control of metal solidification tissue growth. Background technique [0002] With the development of material science, peritectic alloys have become a research hotspot due to their special properties, and have gradually become a class of engineering alloys that are widely used. Many important engineering materials have peritectic reactions, including various steels, copper alloys and magnetic materials. , potential high-temperature structural materials Ti-Al and Fe-Al alloys, Ni-Al alloys, rare earth permanent magnet materials Nd-Fe-B and Co-Sm-Al alloys, and high-temperature oxide superconducting materials Y / Nd-Ba- Cu-O and other new peritectic materials. Although peritectic reactions occur during solidification of many alloys with important industrial applicatio...

Claims

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Application Information

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IPC IPC(8): B22D27/20
Inventor 宋长江郭远益谢柯赵仕超翟启杰
Owner SHANGHAI UNIV
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