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GH4700 alloy ingot homogenizing treatment method

A technology for homogenizing treatment and alloy ingots, applied in the field of metallurgy, can solve problems such as internal defects and melting, and achieve the effect of improving hot working plasticity and uniform overall structure

Inactive Publication Date: 2014-01-01
TAIYUAN IRON & STEEL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the Lave phase is a low melting point phase. If you choose a section of temperature homogenization treatment, if the homogenization temperature is selected above the initial melting temperature of the Lave phase, the Laves phase will melt and internal defects will appear; if the homogenization temperature is selected at the initial melting temperature of the Laves phase Below, the Nb and Ti elements cannot be sufficiently diffused

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1: Heat the resistance furnace to 300°C, put the cast GH4700 alloy into the resistance furnace, raise the temperature to 1130°C at a rate of 100°C / hour, keep it warm for 10 hours, then raise the temperature to 1180°C in half an hour, and keep it warm for 32 Hours, after cooling to 1000°C with the furnace, take it out of the furnace and air cool to room temperature.

Embodiment 2

[0014] Example 2: Heat the resistance furnace to 400°C, put the cast GH4700 alloy into the resistance furnace, raise the temperature to 1150°C at a rate of 100°C / hour, keep it warm for 8 hours, then raise the temperature to 1210°C in half an hour, and keep it warm for 24 Hours, after cooling to 1000°C with the furnace, take it out of the furnace and air cool to room temperature.

Embodiment 3

[0015] Example 3: Heat the resistance furnace to 400°C, put the as-cast GH4700 alloy into the resistance furnace, raise the temperature to 1140°C at a rate of 100°C / hour, keep the temperature for 9 hours, then raise the temperature to 1200°C in half an hour, and keep the temperature for 28 Hours, after cooling to 1000°C with the furnace, take it out of the furnace and air cool to room temperature.

[0016] Scanning electron microscope observation and energy spectrum analysis were carried out on the GH4700 ingot after the homogenization treatment in the above examples. Electron microscope observation shows that the Laves phase in the ingot is completely dissolved, and the dendrite morphology is eliminated. The segregation coefficient K is used to characterize the degree of element segregation, and the analysis results are shown in Table 1.

[0017] Segregation data table before and after homogenization of each embodiment of the present invention:

[0018] .

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PUM

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Abstract

A GH4700 alloy ingot homogenizing treatment method is characterized in that cast-condition alloy is placed into a resistance heated furnace with the temperature lower than 400 DEG C, the temperature is raised to 1130-1150 DEG C at the speed of 100 DEG C / hour, the temperature of 1130-1150 DEG C is kept for 8-10 hours, then the temperature is raised to 1180-1210 DEG C in half an hour, the temperature of 1180-1210 DEG C is kept for 24-32 hours, then the temperature is lowered to 1000 DEG C in a furnace, and the cast-condition alloy is moved out of the furnace to be cooled to room temperature in air. According to the method, Nb and Ti elements of the alloy are made to undergo segregation, the alloy is made to undergo Laves phase elimination, and hot-working plasticity of the alloy is improved.

Description

technical field [0001] The invention belongs to the field of metallurgy, and relates to a nickel-based alloy manufacturing process, in particular to a GH4700 alloy ingot homogenization treatment method. Background technique [0002] GH4700 alloy is a precipitation-strengthened nickel-based superalloy with excellent mechanical properties, structural stability and hot corrosion resistance. Since the alloy contains precipitation strengthening elements such as Al, Ti, and Nb, and its alloying degree is high, there is a phenomenon of solute distribution between the solid phase and the liquid phase during the solidification of the ingot, which eventually leads to dendrites and dendrites after solidification. The inhomogeneous composition between the ingots will cause serious dendrite segregation, and the Laves equivalent harmful phase will inevitably form in the cooled structure of the ingot, which will narrow the hot working temperature range, reduce the plasticity, and deteriora...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/70C22C19/05
Inventor 李阳李莎王岩曾莉郝文慧
Owner TAIYUAN IRON & STEEL GROUP
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