Method for refining carbide in large-size GH4738 cast ingot

A carbide and large-size technology, which is applied in the direction of improving process efficiency and energy efficiency, to achieve the effects of refining carbide size, reducing cooling time, and reducing growth time

Active Publication Date: 2021-02-12
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The large ingot type GH4738 superalloy often adopts a double or triple process with vacuum self-consumption melting as the final smelting link, but there is no report on the smelting process for large-scale carbide refinement in GH4738 ingots

Method used

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  • Method for refining carbide in large-size GH4738 cast ingot
  • Method for refining carbide in large-size GH4738 cast ingot
  • Method for refining carbide in large-size GH4738 cast ingot

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Embodiment 1

[0056] The vacuum induction melting ingot specification of GH4738 superalloy is φ508mm, and the vacuum self-consumption melting ingot specification is φ560mm (that is, the diameter of the final GH4738 ingot is φ560mm). The specific process includes the following steps:

[0057] ① Using pure nickel plate, pure chromium block, pure cobalt plate, pure tungsten bar, electrode carbon, pure molybdenum block, pure aluminum block, sponge titanium, iron-boron alloy, and sponge zirconium as raw materials, the crucible is nickel-washed before smelting. GB / T 14992-2005 Classification and Designation of High-temperature Alloys and Intermetallic High-Temperature Materials" as the standard, add pure nickel plate, pure chromium block, pure cobalt plate, pure tungsten bar, electrode carbon, pure molybdenum block in sequence according to the proportion, and vacuumize To <0.05Pa, power transmission smelting, after melting, power frequency stirring for 20min, sequentially add sponge titanium, pure...

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Abstract

The invention relates to a method for refining carbide in a large-size GH4738 cast ingot. The method comprises the following steps of preparing raw materials, performing vacuum induction melting on the raw materials to obtain an induction melting cast ingot, taking the induction melting cast ingot as a consumable electrode, sequentially carrying out vacuum consumable melting according to an arcingstage, a stable melting stage and a heat capping stage, after finishing the vacuum consumable smelting, conducting furnace cooling, conducting ingot removing, and obtaining a GH4738 cast ingot with refined carbide. By strictly controlling the nitrogen content in the vacuum induction smelting cast ingot and the reasonable smelting rate in the vacuum consumable smelting process and cooperating withan He gas cooling system, carbon segregation in the GH4738 cast ingot is reduced, grains are refined, TiN homogeneous nucleation is promoted, and therefore the effect of refining the carbide size inthe GH4738 cast ingot is achieved. By means of the method, the nitrogen content in the alloy can be effectively reduced, the size of the carbide in the GH4738 cast ingot is refined, and the mechanicalperformance of the GH4738 cast ingot is improved.

Description

technical field [0001] The invention belongs to the technical field of superalloy preparation, and in particular relates to a method for refining carbides in large-size GH4738 ingots. Background technique [0002] GH4738 superalloy has good yield strength and fatigue resistance at 760~870°C, and is widely used in hot end parts such as aeroengine turbine blades. Carbide is an important part of the structure of superalloys and has an important impact on the properties of superalloys. Carbide has a dual role in the alloy. On the one hand, it can strengthen the grain boundary and play a pinning role in the process of stress deformation. On the other hand, large-size carbides destroy the continuity of the alloy and reduce the initiation point of cracks. The mechanical properties of the alloy. The formation mechanism of large-size carbides is divided into two types, one is formed by precipitation from the grain boundary during alloy smelting and solidification, and the other is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B9/20C22B9/05C22C1/02
CPCC22B9/05C22B9/20C22C1/023Y02P10/25
Inventor 杨树峰杨曙磊赵朋曲敬龙王宁杜金辉荣义刘威谷雨周扬徐志强
Owner UNIV OF SCI & TECH BEIJING
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