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An enhanced polycrystalline Ni 3 Heat Treatment Methods for Deformation Stability of Al-Based Superalloys

A heat treatment method and superalloy technology, applied in the field of superalloy structural materials, can solve the problems of poor deformation stability and low initial melting temperature, and achieve the effect of strengthening two-phase interface and improving deformation stability

Active Publication Date: 2019-11-08
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Three consecutive solution treatments made polycrystalline Ni 3 The initial melting temperature of Al-based superalloys is increased, and a series of medium-temperature cyclic aging treatments are used to control the size, shape and distribution of interfacial precipitates, which overcomes the polycrystalline Ni in the as-cast condition. 3 Disadvantages of poor deformation stability and low initial melting temperature of Al-based superalloys

Method used

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  • An enhanced polycrystalline Ni <sub>3</sub> Heat Treatment Methods for Deformation Stability of Al-Based Superalloys
  • An enhanced polycrystalline Ni <sub>3</sub> Heat Treatment Methods for Deformation Stability of Al-Based Superalloys
  • An enhanced polycrystalline Ni <sub>3</sub> Heat Treatment Methods for Deformation Stability of Al-Based Superalloys

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The first step, raw material preparation:

[0028] Select as-cast polycrystalline Ni in the following composition range according to the mass fraction 3 Al-based superalloy, its specific composition is C element: 0.1%; Cr element: 7%; Al element: 8.8%; Ti element: 1.2%; Hf element: 0.7%; W element: 2%; Mo element: 5.5% %; B element: 0.03%; Fe element: 2.2%; Si element: 0.23%; Mn element: 0.23%; shape, then ultrasonically cleaned in alcohol for 10 minutes, and dried for use; put the corundum crucible at 700°C for 3 hours to dehumidify, and stand for use.

[0029] The second step, solution treatment:

[0030] First, the temperature of the box furnace was raised to 1100°C. After the temperature stabilized, the crucible containing the sample was placed in the uniform temperature zone of the box furnace, and argon gas was introduced for gas protection. The sample was kept in the box furnace for 6 hours, the gas protection was stopped, and then the crucible containing the ...

Embodiment 2

[0041] The first step, raw material preparation:

[0042] Select as-cast polycrystalline Ni in the following composition range according to the mass fraction 3 Al-based superalloy, the specific composition is C element: 0.1%; Cr element: 7%; Al element: 8.8%; Ti element: 1.2%; Hf element: 0.7%; W element: 2%; Mo element: 5.5% ; B element: 0.03%; Fe element: 2.2%; Si element: 0.23%; Mn element: 0.23%; , and then ultrasonically cleaned in alcohol for 10 minutes, and dried for use; put the corundum crucible at a temperature of 700°C for 3 hours to dehumidify, and stand for use.

[0043] The second step, solution treatment:

[0044] First, the temperature of the box-type furnace was raised to 1130°C. After the temperature stabilized, the crucible containing the sample was placed in the uniform temperature zone of the box-type furnace, and argon gas was introduced for gas protection. The sample was kept in the box furnace for 8 hours, the gas protection was stopped, and then the...

Embodiment 3

[0054] The first step, raw material preparation:

[0055] Select as-cast polycrystalline Ni in the following composition range according to the mass fraction 3 Al-based superalloy, the specific composition is C element: 0.1%; Cr element: 7%; Al element: 8.8%; Ti element: 1.2%; Hf element: 0.7%; W element: 2%; Mo element: 5.5% ; B element: 0.03%; Fe element: 2.2%; Si element: 0.23%; Mn element: 0.23%; , and then ultrasonically cleaned in alcohol for 10 minutes, and dried for use; put the corundum crucible at a temperature of 700°C for 3 hours to dehumidify, and stand for use.

[0056] The second step, solution treatment:

[0057] First, the temperature of the box-type furnace was raised to 1150°C. After the temperature stabilized, the crucible containing the sample was placed in the uniform temperature zone of the box-type furnace, and argon gas was introduced for gas protection. The sample is kept in the box furnace for 10 hours, the gas protection is stopped, and then the ...

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Abstract

The invention discloses a heat treatment method for enhancing deforming stability of a polycrystal Ni3Al based high temperature alloy. The method comprises following steps that the alloy is subject tosolid melt treatment at the temperatures of 1100 to 1150 DEG C, 1170 to 1230 DEG C and 1270 to 1300 DEG C, intermediate temperature aging treatment is carried out at the temperature of 1000 DEG C to1100 DEG C, the step is repeated for six to ten times, and finally, the Ni3Al based high temperature alloy with deformation stability enhanced is obtained. After three-segment solid solution treatmentand a series of steps of medium temperature circular aging, the incipient melting temperature of the obtained alloy is improved to about 1370 DEG C from the 1345 DEG C under the as-cast condition, anenhanced type gamma' phase with the small size and the round shape can be evenly separated out from the eutectic area and coexistence region interfaces, and deforming stability of the Ni3Al based alloy under the high temperature condition can be improved.

Description

technical field [0001] The invention belongs to the field of superalloy structural materials, in particular to a reinforced polycrystalline Ni 3 Heat treatment methods for deformation stability of Al-based superalloys. Background technique [0002] With the rapid development of nuclear power, energy and aerospace technology, in order to meet the increasing demands of turbine engine and gas turbine thrust-to-weight ratio, supercharging ratio and temperature before the turbine, the requirements for high-temperature alloy structural materials of the core hot end parts of the engine are getting higher and higher . Polycrystalline Ni 3 Al-based superalloys have been widely used in turbine engines and gas turbines due to their advantages such as low density, high melting point, high specific stiffness and yield strength, good ductility, oxidation resistance and creep resistance in a large temperature range. Wide range of applications. In recent decades, for Ni 3 The compositi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/10C22F1/02C22C19/05
CPCC22C19/057C22F1/02C22F1/10
Inventor 夏兴川姜珊彭远祎何鑫刘永长丁俭陈学广
Owner HEBEI UNIV OF TECH
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