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A method of changing into discrete additive casting for preparing homogenized ingot

A homogenization and ingot casting technology, which is applied in the field of discrete additive casting for the preparation of homogenized ingots, can solve problems such as not being able to meet the needs of equipment construction, achieve obvious solidification shrinkage, reduce macro segregation, and reduce waste Effect

Active Publication Date: 2017-11-10
SHANGHAI JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • A method of changing into discrete additive casting for preparing homogenized ingot
  • A method of changing into discrete additive casting for preparing homogenized ingot
  • A method of changing into discrete additive casting for preparing homogenized ingot

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Embodiment 1

[0043] Because the experimental preparation cost of a hundred-ton large-scale ingot is huge, a numerical simulation method is used 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 ingot will be discretized into 10 packs for variable composition casting, and the implementation steps are as follows:

[0044] (1) Carry out the first ladle casting, 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 bag according to the model;

[0046] (3) Carry out next bag casting, treat that it is solidified to solid phase rate and reach 80%;

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

[0048] The weight of the ingot in this embodiment is about 100,000kg. By comparing the macro...

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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 in particular relates to a discrete and additive casting method for preparing homogenized ingots. Background technique [0002] With the development of new energy construction, the demand for large castings and forgings at home and abroad has increased dramatically. Ingots are used as the mother blank of large forgings. At present, there are problems such as low quality and serious waste of materials and energy in the production of ingots. Some defects in the ingot, such as inclusions and composition segregation, cannot be eliminated in the subsequent processing, resulting in the scrapping of forgings or poor performance; other defects, such as uneven grains, seriously affect subsequent forging forming, which may lead to mismatching of forging parameters Cause the forging to crack and be scrapped. [0003] Generally, when castings or ingots are cast, the designed alloy composition is used for u...

Claims

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Application Information

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Patent Type & Authority Patents(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 JIAOTONG UNIV
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