Method for dissolution of nitrogen-rich inclsions in titanium and titanium alloy

An inclusion, titanium alloy electrode technology, applied in the field of electroslag remelting and halide flux to remove nitrogen-rich inclusions, can solve problems such as expensive and time-consuming

Inactive Publication Date: 2000-12-06
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this method is time consuming and expensive

Method used

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  • Method for dissolution of nitrogen-rich inclsions in titanium and titanium alloy
  • Method for dissolution of nitrogen-rich inclsions in titanium and titanium alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Embodiment 1: Observed in the laboratory titanium nitride (TiN) and the mutual reaction of the flux that is base material with calcium fluoride, during observation, immerse 70% Calcium Fluoride (CaF 2 ), 15% calcium oxide (CaO) and 15% aluminum oxide (Al 2 o 3 ) in the flux. The flux is heated by induction heating in a graphite crucible. Melting of titanium nitride (TiN) was seen.

Embodiment 2

[0033] Example 2: Inclusion Preparation - Two types of inclusions were prepared using GE-CRD. The inclusion numbered 30 was prepared by placing nitrided sponge and titanium powder in multiple titanium alloy tubes. These tubes are sealed by electron beam welding with tube plugs. The tubes were then isostatically pressed at 1200°C / 1000 atm / 4 hours. Samples 12.5 mm in diameter and 10 mm in length were cut from these tubes. The nitrogen-containing portion of each sample was 10 mm in diameter.

[0034] The inclusion numbered 49 is prepared by placing titanium nitride powder in multiple titanium alloy tubes. These tubes are sealed by electron beam welding with tube plugs. The tubes were then isostatically pressed at 1200°C / 1000 atm / 4 hours. Samples 12.5 mm in diameter and 10 mm in length were cut from these tubes. The nitrogen-containing portion of each sample was 10 mm in diameter.

[0035] Information on inclusions is summarized in Part I of Schedule 1.

[0036] The prepar...

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Abstract

It has been discovered that electroslag remelting of titanium metal or alloys under controlled partial pressures of nitrogen, and somewhat oxygen, can dissolve nitrogen-rich inclusions to help eliminate or reduce initiation sites for cracks. The process for the electroslag remelting of titanium and titanium alloys ensures that nitrogen-rich inclusions are dissolved or at least minimized during the melting process.

Description

field of invention [0001] The present invention generally relates to the dissolution of nitrogen-rich inclusions in titanium alloys. More particularly, the invention relates to the removal of nitrogen-rich inclusions using electroslag remelting and halide fluxes. Background of the invention [0002] Aircraft jet engine components operating in the temperature range of about 200-500°C are usually made of titanium-based alloys. Aircraft components are often subjected to high cyclic stresses, so the overwhelming mechanical failure mode is low-cycle fatigue (LCF). Such failure begins at the point of initiation and subsequently propagates due to crack extension. [0003] Cracking is not an inherent property of titanium alloys. Cracks are created at initiation sites that are chemically or structurally different from the base titanium alloy. Initiation points are characterized by, for example, hard or brittle deposits and inclusions, voids, a combination of the two, or otherwise...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B9/18
Inventor M·G·本兹B·P·比莱小M·F·吉格利奥蒂小W·T·卡特B·A·克努德森P·J·梅施特R·J·扎巴拉J·P·尼克L·C·佩洛赤V·N·拉德陈科A·D·里尔布特塞夫O·V·塔洛夫
Owner GENERAL ELECTRIC CO
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