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Method for researching action mechanism of trace element phosphorus in wrought superalloy and application

A technology for deforming superalloys and trace elements, applied in the field of superalloys, can solve the problems that the existence mode and action mechanism of deformed superalloys are not unified, the distribution and action are difficult, and the composition and structure of superalloys are complex.

Inactive Publication Date: 2021-09-07
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

However, due to the complex composition and structure of superalloys, it is very difficult to study the distribution and role of P in them.
Therefore, so far, there is no unified conclusion on the existence and mechanism of P in deformed superalloys.

Method used

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  • Method for researching action mechanism of trace element phosphorus in wrought superalloy and application
  • Method for researching action mechanism of trace element phosphorus in wrought superalloy and application
  • Method for researching action mechanism of trace element phosphorus in wrought superalloy and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] 1. Alloy composition

[0058] A furnace of IN706 master alloy was melted, its composition (weight fraction, %): 41.3Ni, 16.21Cr, 1.92Ti, 3.0Nb, 0.37Al, 0.022C, <0.001B, 0.002P, Fe balance. Cut out the master alloy, add 6 different contents of P (0.002%, 0.004%, 0.007%, 0.010%, 0.014%, 0.025), and remelt into daughter alloys.

[0059] 2. Alloy smelting

[0060] vacuum induction melting

[0061] 3. Thermal processing of alloys

[0062] The ingot is homogenized at 1150℃×30h+1190℃×30h

[0063] Heating temperature: 1110±10℃, 4 hours

[0064] Open forging temperature: 1000±10℃

[0065] Final forging temperature: 950°C

[0066] 4. Heat treatment of alloy

[0067] Solution treatment: 920℃~1190℃, keep warm for 5min-4h and then air-cooled / water-cooled.

[0068] Aging treatment: 845°C, 3 hours, 730°C, 10 hours, 55°C / h furnace cooling, 620°C, 8 hours, air cooling.

[0069] 5. Alloy structure and properties

[0070] 1) Microstructure and properties of alloy after solution ...

Embodiment 2

[0085] 1. The composition of Ni-Cr alloy is shown in Table 1

[0086] The composition (wt.%) of the Ni-Cr alloy of table 1 different P content

[0087]

[0088] 2. Alloy smelting

[0089] vacuum induction melting

[0090] 3. Thermal processing of alloys

[0091] Heating temperature: 1110±10℃, 4 hours

[0092] Open forging temperature: 1000±10℃

[0093] Final forging temperature: 950°C

[0094] 4. Heat treatment of alloy

[0095] Solution treatment: 1100℃, 1 hour, water cooling and furnace cooling

[0096] Aging treatment: 720°C, 10 hours, 55°C / h furnace cooling, 620°C, 8 hours, air cooling

[0097] 5. Alloy structure and properties

[0098] The Ni-Cr alloys were solid-dissolved at 1100°C for 1 hour, and the microstructure and morphology of the alloys were significantly different under different cooling methods. Rapid water cooling showed no precipitates at the grain boundaries and within the grains. Slow furnace cooling, there are precipitated phases at the grain b...

Embodiment 3

[0102] 1. The composition of Ni-Cr-Fe alloy is shown in Table 3

[0103] The composition (wt.%) of the Ni-Cr-Fe alloy of table 3 different P contents

[0104]

[0105] 2. Alloy smelting and thermal processing

[0106] Alloy smelting and thermal processing are the same as in Example 2.

[0107] 3. Heat treatment of alloy

[0108] Solution treatment: 1100℃, 1 hour, water cooling

[0109] Aging treatment: 800°C, 8 hours, water cooling

[0110] 4. Alloy structure and properties

[0111] 1) Microstructure and properties of alloy after solution treatment

[0112] (1) Alloy structure

[0113] The microstructure of Ni-Cr-Fe alloy under solid solution condition is as follows: Figure 12 As shown, each alloy was solid-dissolved at 1100°C for 1 hour and then furnace-cooled, a large number of carbides were precipitated on the grain boundaries, and there was no precipitated phase in the grains.

[0114] (2) Tensile properties

[0115] The tensile properties of the alloy after f...

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PUM

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Abstract

The invention aims to provide a method for researching an action mechanism of trace element phosphorus in a wrought superalloy. The method specifically comprises the following steps that different alloy series are formed from simple to complex by changing the components of the wrought superalloy, different trace element phosphorus is added, the existence position and the existence mode of phosphorus, the action relation between the phosphorus and main alloy elements and strengthening alloy elements and the influence on the alloy structure are analyzed by adjusting a heat treatment process, then the influence of the phosphorus element on the alloy performance is evaluated, and the existence mode of the phosphorus in the wrought superalloy, the interaction between the phosphorus and all the alloy elements and the action mechanism are revealed. According to the method, by designing the simplified alloy, raw materials are saved, the labor cost is also saved, and the researching efficiency is greatly improved.

Description

technical field [0001] The invention belongs to the field of high-temperature alloys, and particularly provides a research method and application of the action mechanism of trace element phosphorus in deformed high-temperature alloys. Background technique [0002] Phosphorus is one of the common trace elements in superalloys. Phosphorus was considered to be a harmful element in alloys in the early days. Until the 1970s, people still knew little about the role of phosphorus in superalloys. Bieber and Decker were the first to conduct a systematic study on the role of trace elements in superalloys. ". However, they do not provide strong evidence to support this view. Since then, researchers have started to study the beneficial role of phosphorus in superalloys. [0003] By the 1990s, the beneficial effect of phosphorus in deformed superalloys was recognized. Phosphorus can greatly improve the durable creep properties of some deformed superalloys, and new deformed superalloys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/10C22C1/02C22C19/05
CPCC22F1/10C22C1/023C22C19/055C22C19/058
Inventor 刘芳孙文儒薛超超张伟红贾丹祁峰信昕其他发明人请求不公开姓名
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI