Method for discriminating Laves phase and carbide phase in high Nb iron nickel base high temperature alloy

A high-temperature alloy, iron-nickel-based technology, applied in the preparation of test samples, measuring devices, and material analysis by optical means

Active Publication Date: 2012-06-06
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past inspection work, the Laves phase and the NbC phase were mostly distinguished from the composition, which requires qualified research institutions to distinguish through scanning electron microscopes or electron probes, which greatly affects the inspection cycle

Method used

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  • Method for discriminating Laves phase and carbide phase in high Nb iron nickel base high temperature alloy
  • Method for discriminating Laves phase and carbide phase in high Nb iron nickel base high temperature alloy
  • Method for discriminating Laves phase and carbide phase in high Nb iron nickel base high temperature alloy

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Experimental program
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Effect test

Embodiment 1

[0024] After grinding and polishing the GH4169 as-cast alloy sample, expose the polished sample surface to a box-type resistance furnace at a furnace temperature of 500°C for 1 hour, and then air-cool to ensure that the polished sample surface is not polluted. After the sample was cooled, it was directly observed under a metallographic microscope. The tissue of the sample after being treated at 500°C for 1 hour is as follows: figure 2 shown. It can be seen that after heat dyeing at 500°C for 1 hour, the Laves phase in the sample has turned reddish brown, and the carbides have a certain luster, surrounded by a coating film.

Embodiment 2

[0028] After the GH4169G alloy as-cast sample was ground and polished, the surface of the polished sample was exposed to a box-type resistance furnace at a furnace temperature of 520 ° C for 60 minutes, and the sample was directly observed under a metallographic microscope after cooling. The tissue of the sample after being treated at 520°C for 60 minutes is as follows: Figure 4 As shown, it can be seen that after heat dyeing at 520°C for 60 minutes, the Laves phase in the sample has turned brown, while the carbides have a certain luster.

Embodiment 3

[0032] The Thermo-Span as-cast alloy sample was homogenized at 1120°C for 20 hours. After the sample was ground and polished, the surface of the polished sample was exposed to a box-type resistance furnace at a furnace temperature of 450°C for 80 minutes. After the sample was cooled, Observe directly under a metallographic microscope. The tissue of the sample after being treated at 450°C for 80 minutes is as follows: Figure 6 As shown, it can be seen that after heat dyeing at 450°C for 80 minutes, the Laves phase in the sample has turned reddish brown, and the carbides have a certain luster.

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Abstract

The invention relates to a method for discriminating Laves phase and carbide phase in a high Nb iron nickel base high temperature alloy, which is characterized in that the method comprises the following steps: A) grinding and polishing the high Nb iron nickel base high temperature alloy sample, exposing a polished surface, then placing in a heat treatment furnace, keeping the furnace temperature at 350-600 DEG C, standing for 10-200 minutes, air cooling; B) using a metallographic microscope for observing the high Nb iron nickel base high temperature alloy sample treated in step A). According to the invention, the common metallographic microscope can be used for discriminating a precipitated phase, and the method of the invention is convenient for practical operation of factory, and has the advantages of simple and practical operation, and low cost.

Description

technical field [0001] The invention relates to a qualitative detection method for phases in high-temperature alloys, and particularly provides an analysis method for distinguishing Laves phases and carbides in high-Nb iron-nickel-based high-temperature alloys. Background technique [0002] Nb is a common strengthening element in superalloys. The addition amount (wt.%) of Nb in GH4169 (foreign called IN718), GH907, Thermo-Span and other iron-nickel-based superalloys is between 3% and 6%, which makes the alloy have excellent comprehensive performance in the medium and low temperature range. mechanical properties. During the solidification process, Nb segregation in these alloys is strong, and a large number of Nb-rich massive Laves phases and carbides such as NbC are easily formed between dendrites. The large Laves phase is hard and brittle, and its existence will lead to a sharp decrease in the impact performance and plasticity of the material. It is easy to cause cracks d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/84G01N1/32G01N1/44G01N1/42
Inventor 于连旭孙文儒刘芳祁峰张伟红贾丹信昕郭守仁胡壮麒
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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