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A Grain Boundary Control Method and Welding Process for Improving the Weldability of Cast Superalloys

A high-temperature alloy, welding technology, applied in welding equipment, manufacturing tools, welding media, etc., can solve the problem of unclear mechanism of action

Active Publication Date: 2022-02-01
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, for the superalloy material M951, which has a high application value and a wide range of potential applications, how to improve the resistance to welding hot cracks through the grain boundary control method, and the mechanism behind the grain boundary control to improve the alloy's resistance to welding cracks has not yet been investigated. clear

Method used

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  • A Grain Boundary Control Method and Welding Process for Improving the Weldability of Cast Superalloys
  • A Grain Boundary Control Method and Welding Process for Improving the Weldability of Cast Superalloys
  • A Grain Boundary Control Method and Welding Process for Improving the Weldability of Cast Superalloys

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Embodiment 1

[0034] 5Kg metal materials of pure Ni, Al, Nb, Mo, Co, Cr, W and intermediate alloy Ni-B according to the nominal composition ratio of M951 were placed in the water-cooled copper crucible of the electric arc melting furnace. The alloy raw material is smelted by vacuum induction melting, repeated smelting 2 to 3 times, kept at 1500°C for 20 minutes, and poured at 1460°C, and the smelted and homogenized alloy melt is cast into a plate-shaped sample.

[0035] After smelting and pouring the M951 base metal and vacuum-sealing the plate-shaped sample, the as-cast M951 alloy plate is subjected to solution heat treatment before welding by using a box-type resistance furnace. The temperature of the resistance furnace is kept at 1230°C and the holding time is 2 hours. . The sample cooling process is carried out in a resistance furnace, and the cooling rate is controlled by argon gas, and the cooling rate is an average of 2°C per minute. After cooling to below 300°C, the sample is taken ...

Embodiment 2

[0043] Nominal composition Ni according to M951 71.6 Cr 9 co 5 Al 5.8 W 3.5 Mo 3 Nb 2 B 0.024 C 0.02 (The ingredients are all in mass ratio) The metal material of 5Kg pure Ni, Al, Nb, Mo, Co, Cr, W and intermediate alloy Ni-B of proportioning is placed in the water-cooled copper crucible of electric arc melting furnace. The alloy raw material is smelted by vacuum induction melting, repeated smelting 2 to 3 times, kept at 1500°C for 20 minutes, and poured at 1460°C, and the smelted and homogenized alloy melt is cast into a plate-shaped sample.

[0044] After smelting and pouring the M951 base metal and vacuum-sealing the plate-shaped sample, the as-cast M951 alloy plate is subjected to solution heat treatment before welding by using a box-type resistance furnace. The temperature of the resistance furnace is kept at 1230°C and the holding time is 2 hours. . The sample cooling process was carried out in a resistance furnace, and the cooling rate was controlled by argon g...

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Abstract

The invention discloses a grain boundary control method and a welding process for improving the weldability of cast high-temperature alloys, belonging to the technical field of high-temperature alloy materials. The grain boundary control method is as follows: after the as-cast alloy plate is subjected to solid solution heat treatment, it is cooled by slow cooling in the furnace at a cooling rate of 2-5°C / min, and taken out after cooling to below 300°C; The material is welded by TIG welding process, the welding current is 15-35A, the welding voltage is 10-12V, and the welding speed is 3-5cm / min. During the welding process, the grain boundary precipitates phase M 23 x 6 Solid solution occurs at high temperature, and under the action of B element segregation, the liquid film grain boundary is continuously and evenly distributed. During the welding cooling process, the continuous liquid film ensures the continuity of the grain boundary sliding deformation, resulting in good crack resistance of the superalloy. At the same time, the zigzag grain boundary formed by the grain boundary control method of the present invention can effectively hinder the crack destruction process in the heat-affected zone of the joint.

Description

technical field [0001] The invention relates to the technical field of superalloy materials, in particular to a grain boundary control method and welding process for improving the weldability of cast superalloys. Background technique [0002] Ni-based superalloys mainly through the coherent L1 2 The -γ' phase is strengthened, and the γ' phase is uniformly distributed in the matrix of the FCC phase in a cubic shape. It is difficult to cut through the γ' due to dislocation deformation. Creep deformation ability and excellent anti-fatigue and anti-oxidation properties. For components such as industrial gas turbines and aero engines that face severe service conditions such as high temperature and high stress, the excellent mechanical properties of Ni-based superalloys make them ideal structural materials. M951 superalloy is a cast superalloy independently developed by the Institute of Metal Research, Chinese Academy of Sciences. This superalloy has excellent high-temperature t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/05C22C1/02C22F1/10C21D9/00C21D11/00C22C1/03B23K9/16B23K35/40B23K35/30
CPCC22C19/057C22C1/023C22F1/10C21D9/0081C21D11/005C22C1/03B23K9/16B23K35/40B23K35/304
Inventor 孙元文明月于金江杨彦红周亦胄孙晓峰
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI