Discrete casting method for preparing homogenized cast ingot

Abstract

The invention discloses a discrete casting method for preparing a homogenized ingot, which comprises the following steps: step 1, numerically simulating the discrete pouring process, obtaining the relationship between the solid phase ratio and solidification time in the solidification process as the numerical simulation result; step 2, After smelting, degassing, and slag removal of the molten metal, the alloy liquid is obtained and ready for casting; step 3, adopt the top pouring casting method, use the alloy liquid to cast to a predetermined thickness, and stop pouring; step 4, track and measure the temperature in real time, refer to step 1 According to the numerical simulation results, when the solid phase ratio of the poured metal liquid reaches 70%-80%, the next casting is carried out; step 5, repeat steps 3 and 4 until the casting and solidification of the ingot is completed; step 6, heat treat the ingot To eliminate casting stress. Compared with the ordinary casting process, in the discrete casting method of the present invention, more metal surfaces are in contact with the environment, and the cooling rate is faster, which is helpful for grain refinement.

Description

technical field [0001] The invention relates to a casting method, in particular to a discrete 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, the quality of ingot production is low, and the waste of materials and energy is serious. 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. 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 prod...

AI Technical Summary

Problems solved by technology

Ingots are used as the mother blank of large forgings. At present, the quality of ingot production is low, and the waste of materials and energy is serious.

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 The forging is scrapped due to cracking

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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