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Preparation of nickel-base single-crystal high-temperature alloy through light floating zone melting directional solidification method

A technology of directional solidification and nickel-based single crystal, which is applied in the directions of directional solidification, single crystal growth, and single crystal growth of eutectic materials. Uniform, easy-to-control results

Inactive Publication Date: 2014-04-30
NANJING UNIV OF SCI & TECH +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the process of preparing nickel-based single crystal superalloys by traditional Bridgeman directional solidification technology, the use of crucibles is easy to cause alloy pollution, and there is serious composition segregation between dendrites and dendrites, which seriously affects the performance of nickel-based single crystal superalloys
Composition segregation can be effectively reduced or eliminated by heat treatment, but heat treatment increases the process and increases the cost

Method used

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  • Preparation of nickel-base single-crystal high-temperature alloy through light floating zone melting directional solidification method
  • Preparation of nickel-base single-crystal high-temperature alloy through light floating zone melting directional solidification method
  • Preparation of nickel-base single-crystal high-temperature alloy through light floating zone melting directional solidification method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The composition of this embodiment is shown in Table 1

[0024] Table 1

[0025] Cr co Mo W Ta Re Al f C B Y Ni 7 7.5 1.5 5 6.5 3 6.2 0.15 0.05 0.004 0.01 balance margin

[0026] (1) Vacuum induction heating and melting master alloy;

[0027] (2) Preparation of master alloy cast rods by gravity casting Φ6×100mm;

[0028] (3) Vacuum to 3×10 -3 Pa, flow argon gas at 5L / min, carry out regional melting and directional solidification, control the length of the melting zone at 5mm, melt temperature at 1450°C, crystal growth rate at 5mm / h, and prepare nickel-based single crystal superalloy casting rod Φ6× 50mm;

[0029] (4) Organizational observation: such as image 3 As shown, the structure is relatively uniform without obvious component segregation.

Embodiment 2

[0031] The composition of this embodiment is shown in Table 2

[0032] Table 2

[0033] Cr co Mo W Ta Al f C B Y Ni 7.5 5 2 8 6.5 6.1 0.15 0.05 0.004 0.015 balance margin

[0034] (1) Vacuum induction heating and melting master alloy;

[0035] (2) Preparation of master alloy cast rods by gravity casting Φ4×100mm;

[0036] (3) Vacuum to 3×10 -3 Pa, flow argon gas at 5L / min, conduct regional melting and directional solidification, control the length of the melting zone at 5mm, melt temperature at 1450°C, crystal growth rate at 2mm / h, and prepare nickel-based single crystal superalloy casting rod Φ6× 100mm.

Embodiment 3

[0038] The composition of this embodiment is shown in Table 3

[0039] table 3

[0040] Cr co Mo W Ta Al f C B Y Ni 7 7.5 2 8 6.5 6.1 0.15 0.05 0.004 0.015 balance margin

[0041] (1) Vacuum induction heating and melting master alloy;

[0042] (2) Preparation of master alloy cast rods by gravity casting φ9×100mm;

[0043] (3) Vacuum to 3×10 -3 Pa, flow argon gas at 5L / min, carry out regional melting and directional solidification, control the length of the melting zone at 5mm, melt temperature at 1450°C, crystal growth rate at 1mm / h, and prepare nickel-based single crystal superalloy casting rod Φ9× 500mm.

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Abstract

The invention discloses a method for preparing a nickel-base single-crystal high-temperature alloy through a light floating zone melting directional solidification method. The light floating zone melting directional solidification method is used to prepare the nickel-base single-crystal high-temperature alloy, and an infrared light guide temperature measuring device is used for measuring the temperature. The operation process is as follows: a 60-100mm test bar and a 30-50mm test bar are respectively fixed at the upper end and the lower end of light heating floating zone melting equipment, and the light heating floating zone melting equipment is vacuumized to 3*10<-3>Pa, argon is enabled to flow at the rate of 5mL / min, the upper and lower test bars rotate in the opposite directions at the rate of 20-30r / min, a heating power supply is turned on to raise the temperature to 1450-1500 DEG C at the heating rate of 10-15 DEG C per minute, the temperature is preserved for 3-5min, then the upper and lower ends of the test bars are jointed and drawn at the speed of 1-5mm / h to prepare a single crystal.

Description

technical field [0001] The invention relates to a method for preparing a nickel-based single-crystal superalloy, and in particular provides a non-polluting, non-segregation-free or less-segregation-free optical suspension zone melting directional solidification method for preparing a nickel-based single-crystal superalloy, belonging to the field of single-crystal superalloy preparation . Background technique [0002] With the increasing thrust and thrust-to-weight ratio of aero-engines, materials with higher temperature-bearing capacity are urgently needed to cope with the rising turbine inlet temperature. Turbine blades are one of the parts of aero-engines that are subjected to the most severe temperature loads and the harshest working environment. They are subjected to huge and complex stresses under service conditions, so the requirements for their materials are extremely stringent. Ordinary cast superalloys, due to the irregular arrangement and fast diffusion of atoms a...

Claims

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Application Information

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IPC IPC(8): C30B29/52C30B21/04
Inventor 陈光周雪峰王建成李培源李沛
Owner NANJING UNIV OF SCI & TECH
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