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Vacuum smelting technology of hafnium containing nickel base casting high temperature alloy K488 reverse material alloy

A high-temperature alloy and vacuum melting technology, applied in the field of alloy melting, can solve problems such as the influence of the mechanical properties of the alloy, the specific gravity, etc.

Inactive Publication Date: 2008-05-14
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] K488 alloy is mainly used in the manufacture of working blades of gas turbine turbines. With the production of master alloy and the manufacture of parts, a large amount of alloy waste will inevitably be produced, and the utilization rate of the alloy is only about 20%.
At the same time, the K488 alloy contains 10.0-11.5% Co, and my country is a country lacking in Co resources. Whether these alloy wastes can be recycled is a great economic problem; especially the alloy contains 0.2-0.4% Co Hf, Hf is a strong active metal element, which is easily oxidized to form HfO 2 , while HfO 2 The specific gravity is larger (9.68g / cm 3 ), if it cannot be effectively removed, its suspension in the alloy liquid will have a great impact on the mechanical properties of the alloy

Method used

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  • Vacuum smelting technology of hafnium containing nickel base casting high temperature alloy K488 reverse material alloy
  • Vacuum smelting technology of hafnium containing nickel base casting high temperature alloy K488 reverse material alloy
  • Vacuum smelting technology of hafnium containing nickel base casting high temperature alloy K488 reverse material alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] The selection of returned materials includes:

[0081] (1) Waste materials of K488 master alloy;

[0082] (2) The gating system of K488 waste parts castings and performance test bars, and the runner when pouring master alloys.

[0083] Sand blowing is performed on all returned materials to clean up the sticky iron, inclusions, sand inclusions, etc. on the surface.

[0084] The smelting equipment adopts 25kg, ZG200 vacuum induction furnace.

[0085] The return material is smelted first.

[0086] Hafnium (Hf)-containing nickel-based casting superalloy K488 return material vacuum melting process, including melting, refining, alloy freezing treatment, pouring, alloy composition adjustment process steps.

[0087] The power curve of K488 alloy return material smelting process is shown in figure 1 .

[0088] (1) melting

[0089] When the vacuum degree reaches ≤1.33Pa, it can be powered and melted. Except for cold furnaces, which start to be powered from 80±10kW, hot fur...

Embodiment 2

[0167] The implementation process steps are the same as in Example 1. In the stage of smelting and returning the alloy product, two alloying treatments specifically adjust the alloy composition according to the following proportioning (weight percentage):

[0168] C0.04, Cr16.30, Co11.50, W4.70, Mo1.60, Al3.00, Ti5.00, Nb0.30, Hf0.30, B0.06, Y0.03, Ce0.015, Zr0. 05. The balance is mainly Ni.

Embodiment 3

[0170] The implementation process steps are the same as in Example 1. In the stage of smelting and returning the alloy product, two alloying treatments specifically adjust the alloy composition according to the following proportioning (weight percentage):

[0171] C0.09, Cr15.40, Co10.00, W5.90, Mo2.10, Al2.80, Ti4.20, Nb0.10, Hf0.20, B0.10, Y0.03, Ce0.015, Zr0. 05. The balance is mainly Ni.

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Abstract

The invention relates to hafnium containing nickel base casting high temperature alloy K488 reverts alloy vacuum melting technique. It includes the following steps: melting reverts; pouring after melting, fining, cooling; using alumina ceramics filter screen to do the first filtration for alloy solution while pouring; adjusting the alloy solution component; mixing in proportion of 50% reverts and 50% fresh material; doing the first alloying treatment after melting, fining, cooling; adding dope material C, Cr-B inter-alloy, Al, Ti, Zr; doing the second alloying treatment after cooling; adding Ce, Y, Hf; and using alumina ceramics filter screen to do the second filtration for alloy solution while pouring to gain product. The technique adopts adding rare earth element method to purify reverting alloy. After many times returning melting, all of the alloy capability, chemical component, and impurity content can reach technical condition demand Q / 3B 1376-2005. The N content is far lower than 100ppm.

Description

technical field [0001] The invention belongs to the technical field of alloy smelting, and relates to a smelting process for manufacturing turbine working blade materials used in heavy gas turbines below 900°C, and in particular to a vacuum smelting process for returned alloy K488, a hafnium-containing nickel-based casting superalloy. Background technique [0002] K488 alloy is mainly used in the manufacture of working blades of gas turbine turbines. With the production of master alloy and the manufacture of parts, a large amount of alloy waste will inevitably be produced, and the utilization rate of the alloy is only about 20%. At the same time, the K488 alloy contains 10.0-11.5% Co, and my country is a country lacking in Co resources. Whether these alloy wastes can be recycled is a great economic problem; especially the alloy contains 0.2-0.4% Co Hf, Hf is a strong active metal element, which is easily oxidized to form HfO 2 , while HfO 2 The specific gravity is larger (9...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/03C22C19/05
Inventor 彭志江满延林苏润涛刘一鸣邹建波郭建亭李志军周兰章
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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