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Defect repair method of high-temperature alloy casting

A casting defect repair, superalloy technology, applied in the precision casting field of metallurgical casting, can solve the problem of low qualified rate of components

Inactive Publication Date: 2015-04-08
BEIJING CISRI GAONA TECH
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, how to seal surface defects and improve the effectiveness of hot isostatic pressing to close defects is an important means to solve the low pass rate of superalloy complex components.

Method used

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Embodiment 1

[0013] For a K4169 alloy lower bearing casting, the level of spongy porosity and dendritic porosity in each part is required to be less than level 4. Due to the structural characteristics of the casting, the boss is prone to excessive defects connected with the surface of the casting, and the porosity level can reach 7 to 8, which cannot be eliminated by direct hot isostatic pressing. According to this method, a Φ20mm×5mm circular groove and a Φ19.8mm×5mm cover plate are processed on the surface of the boss, and the cover plate is placed on the groove, fixed by argon arc welding at 4 places, and placed under high vacuum conditions. Down (vacuum degree 10 -4 ~10 -1 Pa), the cover plate is sealed and welded to the groove of the casting with an electron beam. After the hot isostatic pressing system of 1170℃ / 140MPa×4h is used, the casting defects are reduced to 2-3 grades. After adopting this method, the pass rate of castings is increased from 20% to 60%.

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Abstract

The invention discloses a defect repair method of a high-temperature alloy casting, and belongs to the technical field of precision casting of metallurgical casting. A defect communicated with the surface of the casting is changed into a closed defect by using electron beam surface blocking, and then hot isostatic pressing is performed on the closed defect, so that the qualification rate of the casting is improved. The electron beam surface blocking process comprises the following steps and control technical parameters: detecting through visual contact, fluorescence and X-ray to determine a loose region and level; machining a square or circular groove with an area of being greater than that of the defect and depth of 3-5 mm on the surface with the defect of the casting if a defect beyond tolerance communicated with the surface exists; machining a matchable cover plate with thickness equal to that of the groove and gap of 0.1-0.5, placing the cover plate on the groove and spot-welding at 3-4 positions by using argon arc welding for fixation; sealing and welding the cover plate at the groove of the casting by using an electron beam under the condition that the vacuum degree is 10<-4> to 10<-1> Pa. The method has the advantages that the electron beam surface defect blocking and hot isostatic pressing defect closing are combined, the effectiveness for repair of the casting through the hot isostatic pressing is improved, and the method can be used for producing high-temperature alloy composite members.

Description

technical field [0001] The invention belongs to the technical field of precision casting of metallurgical casting. In particular, it provides a method for repairing defects of superalloy castings, which is suitable for repairing defects such as excessive shrinkage cavities and porosity of superalloy complex components. Background technique [0002] Cast superalloys have a high degree of alloying, a wide range of liquid-solid phase temperatures, and are prone to form coarse dendrites, reducing melt fluidity and feeding effects. With the development of aviation and aerospace technology, the structure of high-temperature alloy castings is becoming more and more complex, and the wall thickness varies greatly, which affects the filling and shrinkage of castings, and is prone to shrinkage cavities and loose defects, and the qualified rate of castings is low. Hot isostatic pressing technology uses high temperature and high pressure to make castings undergo micro-creep, thereby clo...

Claims

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Application Information

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IPC IPC(8): B23P6/00
CPCB23P6/00
Inventor 吴剑涛燕平李俊涛李维孔胜国陈兴福赵京晨
Owner BEIJING CISRI GAONA TECH
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