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A method for refining the solidification structure of 800h corrosion-resistant alloy ingot

A technology of solidification structure and corrosion-resistant alloy, which is applied in the direction of casting mold, casting mold composition, casting molding equipment, etc., can solve the problems of increasing heterogeneous nucleation rate, inconvenient operation, large investment, etc., and achieves easy control of smelting process and convenient Simple operation and adding method

Active Publication Date: 2018-05-18
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing method to improve the solidification structure of 800H alloy ingot is mainly to use electromagnetic stirring in the secondary cooling zone, control the frequency and intensity of the stirring current, break or melt the dendrites, and increase the heterogeneous nucleation rate to refine the solidification of the ingot organization, this method requires additional electromagnetic stirring equipment, which requires large investment, high cost, and inconvenient operation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add pure iron, ferrochromium, ferronickel, ferromanganese, and sponge titanium into the electric furnace according to the ratio of 800H alloy, and heat up to 1500°C under an argon protective atmosphere. The aluminum wire is deoxidized and alloyed, refined for 3 minutes, and the oxygen content of the melt is detected to control the oxygen content in the melt to 70ppm. Then, 200ppm of rare earth La is added, refined for 1 minute, and the temperature of the melt is lowered. When the temperature drops to 1430°C, The melt is cast into metal molds. After the alloy ingot was ground and corroded, the macrostructure of the upper cross-section of the ingot was detected. After adding 200ppm rare earth La, the columnar grains in the solidification of the alloy ingot become shorter and thinner obviously, grow in the shape of a basket, and the proportion of equiaxed grains increases to 35%.

Embodiment 2

[0030] Add pure iron, ferrochromium, ferronickel, ferromanganese, and sponge titanium into the electric furnace according to the ratio of 800H alloy, and heat up to 1500°C under an argon protective atmosphere. The aluminum wire is deoxidized and alloyed, refined for 3 minutes, and the oxygen content of the melt is detected to control the oxygen content in the melt to 65ppm. Then, 180ppm of rare earth Ce is added, refined for 1 minute, and the temperature of the melt is lowered. When the temperature drops to 1430°C, The melt is cast into metal molds. After the alloy ingot was ground and corroded, the macrostructure of the upper cross-section of the ingot was detected. After adding 180ppm of rare earth Ce, the columnar grains became shorter and thinner obviously during the solidification of the alloy ingot, growing in the shape of a basket, and the proportion of equiaxed grains increased to 32%.

Embodiment 3

[0032] Add pure iron, ferrochromium, ferronickel, ferromanganese, and sponge titanium into the electric furnace according to the ratio of 800H alloy, and heat up to 1500°C under an argon protective atmosphere. The aluminum wire is deoxidized and alloyed, refined for 3 minutes, and the oxygen content of the melt is detected to control the oxygen content in the melt to 65ppm. Then, 230ppm of rare earth Y is added, refined for 1 minute, and the temperature of the melt is lowered. When the temperature drops to 1430°C, The melt is cast into metal molds. After the alloy ingot was ground and corroded, the macrostructure of the upper cross-section of the ingot was detected. After adding 230ppm rare earth Y, during the solidification of the alloy ingot, the columnar grains became shorter and thinner obviously, growing in a basket shape, and the proportion of equiaxed grains increased to 45%.

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Abstract

The invention relates to a method for refining an 800H corrosion resistant alloy ingot casting solidification tissue, aims at solving the problem of thick and great alloy ingot casting solidification tissues, and belongs to the technical field of metal solidification control. The method comprises the links of alloy melting, deoxidation alloying, refining, casting and the like. The method is characterized in that melting alloy is proportioned according to chemical ingredients in protection atmosphere, heat insulation is performed for 3min; ingredients and temperature are equalized; a proper number of aluminum wires are added; deoxidation is performed; refining is performed for 5min, so that the oxygen content in melt is controlled at 60 to 100ppm; the temperature is controlled at 1500 + / -20 DEG C; then, 100 to 300 ppm of refining agents such as rare earth Ce, La and Y are added; the refining is performed for 1 to 2 min; the melt is subjected to temperature reduction; when the temperature is reduced to 1430 to 1440 DEG C, the melt is cast into a metal cast mold; the ingot casting tissues with fine solidification tissues can be obtained. The refining agent has the advantages that the addition method is simple; the melting process can be easily controlled; the additional addition of equipment is not needed; the operation is convenient; the industrial ingot casting and continuous production can be met.

Description

technical field [0001] The invention belongs to the technical field of metal solidification control, and in particular relates to a method for refining the solidification structure of an 800H corrosion-resistant alloy ingot. Background technique [0002] 800H alloy is a nickel-iron-chromium corrosion-resistant alloy, which contains 46.0% Fe, 30.0% ~ 35.0% Ni, 19% ~ 23% Cr and no more than 0.1% C, and also contains a small amount of Mn, Si, Cu, Al , Ti and other alloying elements, the alloy has good high-temperature mechanical properties, excellent oxidation resistance and corrosion resistance, and is widely used in petrochemical industry, nuclear reactors, solar energy devices and supercritical water-cooled reactors. [0003] The 800H corrosion-resistant alloy is a stable single-phase austenitic structure alloy. During the solidification process, there is no phase transformation. The ingot structure is almost completely coarse columnar crystals, which leads to serious alloy ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/06C22C30/00B22C9/06
CPCB22C9/06C21C7/06C22C1/06C22C30/00C22C38/40C22C38/50
Inventor 于彦冲王社斌任祥李豪张少华
Owner TAIYUAN UNIV OF TECH
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