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Method for refining nitride inclusions in nickel base deformation high temperature alloy

A technology for deforming superalloys and nitrides, applied in the field of nitrides inclusions, can solve the problems of fatigue failure and can not be eliminated, and achieve the effect of reducing the number, uniform distribution and stable process

Active Publication Date: 2019-02-01
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the inclusion size is large, it may cause fatigue failure
Moreover, such inclusions can hardly be eliminated during forging deformation and heat treatment

Method used

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  • Method for refining nitride inclusions in nickel base deformation high temperature alloy
  • Method for refining nitride inclusions in nickel base deformation high temperature alloy
  • Method for refining nitride inclusions in nickel base deformation high temperature alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: GH4169 nickel base deformation superalloy

[0020] (1) Raw material pretreatment process: using bulk pure nickel, pure chromium, pure cobalt, pure tungsten, pure molybdenum, pure niobium, pure aluminum, pure titanium, high-purity graphite, boron, zirconium, etc. as raw materials, various raw materials The purity is greater than 99.9%; metal raw materials are pretreated in 5vol.% hydrochloric acid aqueous solution to remove surface oxides, and the pretreatment time is 25 minutes; then various metal raw materials are placed in absolute ethanol for ultrasonic treatment, and the treatment time is 15 minutes .

[0021] (2) Vacuum induction melting process: first put Ni, Cr, Co, W, Mo, Fe, which have low affinity with O and N, into the crucible of the vacuum induction melting furnace; vacuumize to 5×10 -2 Pa, for smelting; after the melt is melted, add C and refine for 25 minutes; add strong nitride and oxide forming elements Nb, Ti, Al, and heat until the adde...

Embodiment 2

[0028] Embodiment 2: GH4169 nickel base deformation superalloy

[0029] (1) Raw material pretreatment process: using bulk pure nickel, pure chromium, pure cobalt, pure tungsten, pure molybdenum, pure niobium, pure aluminum, pure titanium, high-purity graphite, boron, zirconium, etc. as raw materials, various raw materials The purity is greater than 99.9%; metal raw materials are pretreated in 5vol.% hydrochloric acid aqueous solution to remove surface oxides, and the pretreatment time is 25 minutes; then various metal raw materials are placed in absolute ethanol for ultrasonic treatment, and the treatment time is 15 minutes .

[0030] (2) Vacuum induction melting process: first put Ni, Cr, Co, W, Mo, Fe, which have low affinity with O and N, into the crucible of the vacuum induction melting furnace; vacuumize to 5×10 -2 Pa, for smelting; after the melt is melted, add C and refine for 20 minutes; add strong nitride and oxide forming elements Nb, Ti, Al, and heat until the adde...

Embodiment 3

[0036] Embodiment 3: GH4220 nickel base deformation superalloy

[0037] (1) Raw material pretreatment process: using bulk pure nickel, pure chromium, pure cobalt, pure tungsten, pure molybdenum, pure niobium, pure aluminum, pure titanium, high-purity graphite, boron, zirconium, etc. as raw materials, various raw materials The purity is greater than 99.9%; metal raw materials are pretreated in 5vol.% hydrochloric acid aqueous solution to remove surface oxides, and the pretreatment time is 25 minutes; then various metal raw materials are placed in absolute ethanol for ultrasonic treatment, and the treatment time is 15 minutes .

[0038] (2) Vacuum induction melting process: first put Ni, Cr, Co, W, Mo, Fe, which have low affinity with O and N, into the crucible of the vacuum induction melting furnace; vacuumize to 5×10 -2 Pa, for smelting; after the melt is melted, add C and refine for 25 minutes; add strong nitride and oxide forming elements Nb, Ti, Al, and heat until the adde...

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Abstract

The invention relates to a method for refining nitride inclusions in a nickel base deformation high temperature alloy. The method includes the following steps that (1), surface pretreatment of metal raw materials is carried out; (2), vacuum induction melting is carried out, specifically, Ni, Cr, Co, W, Mo and so on are put into a crucible and vacuumized, C, Nb, Ti and Al are added after melting, agon is filled, B and Zr are added, then the product is completely melted and poured into a steel mold, and a high temperature alloy electrode is obtained; and (3), vacuum electroslag remelting is carried out, specifically, slag charges containing 0.01-0.5 wt.% of MgO are used, vacuumed to 0.01-100 Pa and then filled the high purity agon to 0.01-0.06 MPa, and slugging and refining are carried out.According to the method for refining the nitride inclusions in the nickel base deformation high temperature alloy, fine even distributed MgO inclusions are formed through a metallurgical reaction of slag and alloy liquid during electroslag remelting, and the core for subsequent formation of the nitride inclusions is provided; the size of the nitride inclusions is decreased, and distribution is more uniform; vacuum electroslag remelting can reduce the number of the nitride inclusions; and by controlling the MgO content in electroslag and technological parameters of electroslag remelting, the content of Mg and the quantity and size of Mg oxide inclusions in the alloy can be precisely controlled, the process is stable, and costs are low.

Description

technical field [0001] The invention belongs to the field of high-temperature alloy preparation, and more specifically relates to a method for refining nitride-based inclusions in nickel-based deformed high-temperature alloys by using an electroslag remelting process. Background technique [0002] Superalloys are alloys with a service temperature exceeding 650°C and have good thermal stability and strength. According to its production process, it can be divided into three categories: deformed superalloy, casting superalloy and powder metallurgy superalloy. According to its composition, it can be divided into three categories: nickel-based superalloys, cobalt-based superalloys and iron-based superalloys. Among them, the nickel-based deformed superalloy has good mechanical properties and comprehensive strength and toughness indicators, as well as good thermal fatigue resistance, thermal corrosion resistance and corrosion resistance. Therefore, it is widely used in aerospace,...

Claims

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Application Information

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IPC IPC(8): C22C1/03C22C19/05
CPCC22C1/023C22C1/03C22C19/051
Inventor 章林高小勇曲选辉陈晓玮栾益锋宋利军
Owner UNIV OF SCI & TECH BEIJING
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