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Pre-deforming heating method of GH4169 alloy

A technology of GH4169 and heating method, which is applied in the field of heating before deformation of GH4169 alloy, and can solve problems such as inappropriate δ phase morphology and distribution, uneven performance of forgings, and composition segregation of micro-regions in the alloy.

Active Publication Date: 2017-05-31
重庆两航金属材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the current three-stage heating specification, the medium-temperature holding temperature is mostly between 940 and 985°C, which is close to the peak temperature of the δ phase precipitation. Keeping at this temperature for a long time will inevitably lead to improper morphology and distribution of the δ phase. , causing composition segregation in the micro-area of ​​the alloy, resulting in inhomogeneous properties of forgings

Method used

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  • Pre-deforming heating method of GH4169 alloy
  • Pre-deforming heating method of GH4169 alloy
  • Pre-deforming heating method of GH4169 alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0095] Three kinds of rods with different Nb contents, the rod size is Φ220×360mm, were selected to observe the core structure. For different Nb contents, select medium-temperature holding temperature in the range of 800-960°C, among which the medium-temperature temperatures of high-Nb alloys are 850°C and 890°C; the medium-temperature temperatures of medium-Nb alloys are 895°C and 890°C; It is 909°C and 900°C, and the holding time is obtained by the product of the rod diameter and the heat preservation coefficient 8min / 10mm, which is 176min. After finishing the middle temperature insulation, observe the structure results of different samples. The structure of the high Nb alloy magnified 500 times under the condition of 890 ℃ is as follows: image 3 As shown, the microstructure of the medium Nb alloy at 895°C magnified 500 times is as follows Figure 4 As shown, the structure of the low Nb alloy magnified 500 times at 909 °C is as follows Figure 5 shown. Depend on Figure...

Embodiment 2

[0097] Three kinds of rods with different Nb contents, the rod size is Φ220×360mm, were selected to observe the core structure. For different Nb contents, after 172 minutes of heat preservation treatment at the same medium-temperature heat preservation temperature, high-temperature heat preservation is carried out, and the high-temperature heat preservation temperature is selected in the range of 970-1070°C, and the medium-temperature temperatures of high-Nb alloys are 1012°C and 1016°C; The medium temperature of the medium Nb alloy is 1020°C and 1012°C, the medium temperature of the low Nb alloy is 1030°C and 1025°C, and the holding time is obtained by the product of the rod diameter and the heat preservation coefficient 6min / 10mm, which is 132min. After completing the high temperature insulation, the microstructure results of different samples were observed. The microstructure of the high Nb alloy under the condition of 1012°C was as follows: Figure 6 As shown, the microstr...

Embodiment 3

[0099] Get high Nb alloy according to the composition shown in table 1, on the basis of embodiment 1 and embodiment 2, according to Figure 9 The heating flow diagram shown is for heat treatment of high Nb alloys. The organizational structure after magnification of 200 times is as follows Figure 10 shown.

[0100] According to the measured results: the average temperature time from the end of the medium temperature insulation to the final bar reaching the target temperature is 70 minutes, and the total heating time is 478 minutes.

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Abstract

The invention provides a pre-deforming heating method of a GH4169 alloy. The method comprises the following steps: performing intermediate temperate insulation after first stage heating on the GH4169 alloy; and then heating the alloy after intermediate temperate insulation and performing high-temperature insulation, wherein the intermediate temperate insulating temperature is 880-920 DEG C, and the high-temperature insulating temperature is 1000-1045 DEG C. According to the method provided by the invention, the GH4169 alloy is heated in two sections. Compared with the prior art, the heating time is only 2 / 3 of that of conventional three-section heating, so that the heating efficiency is improved; a temperature of 880-920 DEG C is taken as the heating temperature of intermediate temperature insulation, so that superposition with a delta-phase separating out peak temperature is avoided, the delta-phase shape is controlled, and the tissue homogeneity is improved.

Description

technical field [0001] The invention relates to the technical field of GH4169 alloy processing, in particular to a method for heating the GH4169 alloy before deformation. Background technique [0002] Superalloys refer to high-alloyed iron-based, niobium-based or cobalt-based austenitic metal materials that can withstand relatively large and complex stresses above 600 °C and have surface stability. Superalloys are widely used in the fields of aviation, aerospace and navigation because of their good high-temperature strength, oxidation resistance, corrosion resistance, fatigue resistance, creep resistance, fracture resistance and structural stability. [0003] GH4169 alloy is a high-temperature alloy with a high degree of alloying, and is the most widely used high-temperature alloy. However, the thermal deformation performance of GH4169 alloy is poor, and GH4169 alloy needs to be heated before deformation to ensure that GH4169 alloy has good plasticity in the subsequent defo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/10
CPCC22F1/10
Inventor 刘东郑勇杨艳慧王建国胡阳王海平
Owner 重庆两航金属材料有限公司