Dispersion additive casting method for preparing homogenized ingot by use of variable components

A technology of homogenization and ingot casting, which is applied in the field of discrete and discrete additive casting for preparing homogenized ingots, can solve problems such as the inability to meet the needs of equipment construction, achieve obvious solidification shrinkage, reduce macrosegregation, shrinkage cavities, etc. Defect mitigation effect

Active Publication Date: 2016-09-21
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

[0004] According to statistics, 60% of unqualified products in the production of large-scale forgings are caused by the quality of ingots. As a result, the production of large-scale forgings in my country is in the groping production stage of "seeking finished products with quantity and exchanging quality with consumption", which cannot meet the needs of my country's navigation, Nuclear power, thermal power and other major equipment construction needs

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  • Dispersion additive casting method for preparing homogenized ingot by use of variable components
  • Dispersion additive casting method for preparing homogenized ingot by use of variable components
  • Dispersion additive casting method for preparing homogenized ingot by use of variable components

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Embodiment 1

[0043] Due to the huge experimental preparation cost of a hundred-ton large ingot, a numerical simulation method is adopted to verify the method of the present invention. In this embodiment, a steel ingot with a height of 4.4 m and a diameter of about 2.4 m is used as the research object, and the carbon content is 0.2%. The ingots will be divided into 10 packs for split casting. The implementation steps are as follows:

[0044] (1) Carry out the first ladle casting, and wait for it to solidify until the solid phase ratio reaches 80%;

[0045] (2) Measure the remaining molten metal composition in the previous step, and calculate the composition of the next package according to the model;

[0046] (3) Carry out the next ladle casting, and wait for it to solidify until the solid phase ratio reaches 80%;

[0047] (4) Repeat steps (2)-(3) eight times until the ingot is formed;

[0048] The weight of the ingot in this example is about 100000kg. By comparing the macrosegregation distribution...

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Abstract

The invention provides a dispersion additive casting method for preparing homogenized ingot by use of variable components. The method comprises the steps of dividing the ingot into N casting ladles for dispersion casting, wherein the casting component of a first casting ladle is decided by a target alloy component; the casting component of each casting ladle thereafter is decided by a target alloy component, a solidified segregation morphology of the last casting ladle, and the solute content of residual metallic liquid of the last casting ladle. According to the variation dispersed material additive casting method for preparing the homogenized ingot casting provided by the invention, according to the quality, a window is required to adjust the casting metallic liquid, so that the homogenization of an ingot solute is realized, and the macrosegregation of the whole ingot is greatly reduced.

Description

Technical field [0001] The invention belongs to the field of metal casting, and particularly relates to a method for preparing a homogenized ingot into a discrete additive casting method. Background technique [0002] With the development of new energy construction, the demand for large castings and forgings at home and abroad has increased sharply. As the master billet of large forgings, ingot production has problems such as low quality and serious waste of materials and energy. Some defects in the ingot, such as inclusions and component segregation, cannot be eliminated in the subsequent processing, resulting in scrap or poor performance; other defects such as uneven grains seriously affect the subsequent forging shape and may lead to mismatched forging parameters. Cause the forging to crack and be scrapped. [0003] Generally, when casting or ingot casting, the designed alloy composition is used for unified melting and simultaneous casting. Due to the large ingots used to man...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D7/02B22D27/20
CPCB22D7/02B22D27/20
Inventor 李军任凤丽葛鸿浩王军格夏明许韩秀君李建国
Owner SHANGHAI JIAO TONG UNIV
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