Welding repair process suitable for cast nickel-base superalloy casting

A technology for superalloys and castings, applied in the field of welding repair technology, can solve the problems of poor welding performance of nickel-based superalloys and have not been effectively improved, so as to improve the welding repair efficiency, prevent the occurrence of cracks, and avoid multiple welding repairs. Effect

Inactive Publication Date: 2017-02-22
上海万泽精密铸造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although scholars at home and abroad have done a lot of research on the heat treatment process of nickel-based superalloys and their welded joints, most of these studies are aimed at post-weld heat treatment, and the disadvantages of poor weldability of nickel-based superalloys with high titanium and aluminum content still remain. not effectively improved

Method used

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  • Welding repair process suitable for cast nickel-base superalloy casting
  • Welding repair process suitable for cast nickel-base superalloy casting
  • Welding repair process suitable for cast nickel-base superalloy casting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Microscopic shrinkage was found in guide vanes cast with material brand CM939 superalloy after casting. The mass percentages of the main elements of this brand superalloy were Cr 22.0~22.8%, Co 18.5~19.5%, Ti3.6~3.8%, Al 1.8~ 2.0%, W1.8~2.2%, a small amount of impurity elements that cannot be completely removed during the smelting process, and the rest is Ni; the welding repair process of the above-mentioned defective guide vanes includes the following steps: digging out the shrinkage part and processing it out Groove, the groove angle is 60-70° without blunt edge; use stainless steel wire brush and acetone to clean the groove and the surface around the groove; this can prevent the groove surface from overheating and carburizing the groove surface; After cleaning, use penetrant testing, if there is no crack on the surface, it is qualified; put the casting in 1250 o C heat preservation 14 hours, control furnace temperature with 55 o C / min average rate of cooling to room...

Embodiment 2

[0025] The guide vane cast with the material grade GTD222 superalloy has holes with a diameter of about 10mm that need to be repaired. The mass percentages of the main elements of this grade of superalloy are Cr 22.2~22.8%, Co 18.5~19.5%, Ti2.20~2.40% , Al 1.10~1.30%, W 1.80~2.20%, a small amount of impurity elements that cannot be completely removed during the smelting process, and the rest is Ni.

[0026] The welding repair process for the above-mentioned defective guide vanes includes the following steps: clean the surface around the hole with a stainless steel wire brush and acetone before welding repair; 1205 o C heat preservation 12 hours, control furnace temperature with 62 o C / min average rate of cooling to room temperature. Argon arc welding was used for surfacing repair, and after welding, grinding and solution treatment were carried out. No welding cracks were found in the welding repair area by visual observation and X-ray non-destructive testing (see Figure 4 ...

Embodiment 3

[0028] Use the nozzle liner set cast by the superalloy of material grade K4648. The mass percentage of the main elements of the superalloy of this grade is Cr32.0~35.0%, Mo 2.30~3.50%, Ti0.70~1.30%, Al 0.70~1.30% , W 4.30~5.50%, Nb0.70~1.30%, a small amount of impurity elements that cannot be completely removed during the smelting process, and the rest is Ni.

[0029] Microscopic porosity with a diameter of about 30 mm occurs in the flange after casting. Before welding repair, dig out the loose part and process the groove, the groove angle is 60-70° without blunt edge; use stainless steel wire brush and acetone to clean the groove and the surface around the groove; this can prevent the groove surface from Overheating and carburizing of the groove surface; after the groove and its surroundings are cleaned, the penetration test is used, and it is qualified if there is no crack on the surface; the casting is placed in 1290 o C heat preservation 12 hours, control furnace temperat...

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Abstract

The invention relates to a welding repair process suitable for a cast nickel-base superalloy casting. The process is suitable for welding repair of the cast nickel-base superalloy casting of which the mass percent of Ti does not exceed 5.2% and the mass percent of Al does not exceed 6.5%. Before welding repair, homogenization heat treatment is performed on the casting of which defective parts are removed, the holding temperature of the homogenization heat treatment is not lower than 1205 DEG C and is not greater than 93% of melting temperature of the casting, and the holding time is not less than 10 hours, so that the casting generates high-temperature tissues; the cooling speed of the casting after the homogenization heat treatment is not less than 30 DEG C per minute, so that the high-temperature tissues of the alloy are reserved, cracks are prevented during welding repair, the welding repair for many times is avoided, and the welding repair efficiency is effectively improved.

Description

technical field [0001] The invention relates to a welding repair process suitable for nickel-based high-temperature alloy castings with high titanium content and aluminum content. Background technique [0002] Nickel-based superalloys are the key materials of aero-engines. They have excellent heat resistance and corrosion resistance, and have the characteristics of stable structure, high working temperature, and strong alloying ability. The important metal materials necessary for the engine have been widely used in the fields of high temperature chemistry, atomic energy industry and ground turbines. [0003] Aluminum and titanium are the main strengthening elements in high-temperature nickel-based alloys. About 80% of Al and 90% of Ti and Ni form in the alloy. -Ni 3 Al phase to strengthen the matrix. Cast nickel-based superalloys with high titanium and aluminum content are due to the existence of a large number of long-range ordered Strengthening phase, with good high-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/04B23K9/16B23K9/23B23K9/235C22F1/10
CPCB23K9/16B23K9/04B23K9/23B23K9/235C22F1/10
Inventor 魏剑辉陈博文陆敏
Owner 上海万泽精密铸造有限公司
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