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A method of controlling non-metallic inclusions in powder metallurgy superalloy master alloy

A technology of non-metallic inclusions and superalloys, which is applied in the field of powder metallurgy superalloy preparation, can solve the problems of high vacuum degree and many inclusions, and achieve the effects of uniform distribution, low cost and pollution avoidance

Active Publication Date: 2020-05-08
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the vacuum degree is higher, resulting in more nitride-based inclusions

Method used

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  • A method of controlling non-metallic inclusions in powder metallurgy superalloy master alloy
  • A method of controlling non-metallic inclusions in powder metallurgy superalloy master alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: FGH4096 powder metallurgy superalloy master alloy

[0022] (1) Raw material surface pretreatment process: use block 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%; the metal raw materials are pretreated in 5vol.% hydrochloric acid aqueous solution to remove surface oxides, and the pretreatment time is 30 minutes; then various metal raw materials are placed in absolute ethanol for ultrasonic treatment, and the treatment time is 15min.

[0023] (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 unti...

Embodiment 2

[0027] Example 2: FGH4096 powder metallurgy superalloy master alloy

[0028] (1) Raw material surface pretreatment process: use block 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%; the metal raw materials are pretreated in 5vol.% hydrochloric acid aqueous solution to remove surface oxides, and the pretreatment time is 30 minutes; then various metal raw materials are placed in absolute ethanol for ultrasonic treatment, and the treatment time is 15min.

[0029] (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 unti...

Embodiment 3

[0033] Embodiment 3: FGH4097 powder metallurgy superalloy master alloy

[0034] (1) Raw material surface pretreatment process: use block 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%; the metal raw materials are pretreated in 5vol.% hydrochloric acid aqueous solution to remove surface oxides, and the pretreatment time is 30 minutes; then various metal raw materials are placed in absolute ethanol for ultrasonic treatment, and the treatment time is 15min.

[0035] (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 u...

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Abstract

A method for controlling nonmetallic inclusions in mother alloys of high-temperature powder metallurgy alloys comprises the following steps: (1) performing hydrochloric acid and ultrasonic treatment on metal raw materials; (2) performing vacuum induction melting, namely placing Ni, Cr, Co, W, and Mo into a crucible and vacuumizing, adding C, Nb, Ti, and Al after melting, introducing argon gas, adding B and Zr, until alloy liquid is melted again, and pouring into a steel mold to obtain high-temperature alloy ingots; (3) performing vacuum electroslag remelting, namely vacuumizing to 0.01-100 Pa,then introducing high-pure argon gas to 0.01-0.06 MPa, and preparing fine materials from slag containing MgF2and CeO2; and (4) performing vacuum magnetic suspension induction melting, namely placingthe fine materials into a copper crucible, quickly solidifying after melting, and removing the inclusions on the upper end surfaces of the ingots, performing vacuum magnetic suspension induction melting again, cooling, and removing the inclusions on the upper end surfaces so as to obtain the high-purity mother alloys of the high-temperature powder metallurgy alloys. By using the method, the size and the number of the nonmetallic inclusions in the mother alloys of the high-temperature powder metallurgy alloys can be significantly reduced, and the distribution is relatively uniform.

Description

technical field [0001] The invention belongs to the field of powder metallurgy superalloy preparation, and more specifically relates to a manufacturing method for reducing non-metallic inclusions in powder metallurgy superalloy master alloys by using a multi-connected vacuum smelting process. Background technique [0002] Powder metallurgy superalloy is the material of choice for national defense and military equipment such as aero-engine hot-end parts (turbine disks). It is characterized by no macro-segregation, uniform structure, fine grains, excellent mechanical properties and thermal process properties, and effectively guarantees The reliability and durability of the engine are improved, and it can be near net shape, and the manufacturing cycle is short. Due to the chemical composition of powder metallurgy superalloys (high content of active wave elements Al and Ti) and the particularity of manufacturing process, defects such as original grain boundaries, thermally induc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B9/18C22C1/02C22C1/04
CPCC22B9/18C22C1/02C22C1/04Y02P10/25
Inventor 章林高小勇曲选辉陈晓玮宋利军栾益锋
Owner UNIV OF SCI & TECH BEIJING
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