Stacking heat treatment process of iron-based high temperature alloy and performance research

An iron-based superalloy and process technology, which is applied in the field of iron-based superalloy accumulation heat treatment process and its performance research, can solve the problems of backward mold manufacturing methods, few new mold materials, and backward hot work molds, and achieve a considerable period of life. , the parts are intact, the effect of saving expenses

Inactive Publication Date: 2018-11-16
安徽恒利增材制造科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the hot work die steels widely used in China are H13 steel and 3Cr2W8V. The current situation of working die steel is worrying, and the demand for hot working die steel is imminent

Method used

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  • Stacking heat treatment process of iron-based high temperature alloy and performance research
  • Stacking heat treatment process of iron-based high temperature alloy and performance research
  • Stacking heat treatment process of iron-based high temperature alloy and performance research

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Determination of heat treatment process parameters:

[0032] The performance of superalloys mainly depends on its chemical composition and structure. When the alloy composition is constant, the factors affecting the structure of the alloy include smelting, casting, plastic deformation and heat treatment process, and the heat treatment process is more sensitive to the influence of the alloy structure. Different heat treatments can make the grain size of the alloy, the strengthening phase, the number and particle size of the dissolved and precipitated phases, and even the state of the grain boundary. Therefore, an alloy has different structures after different heat treatments, and thus has different properties and uses. Superalloys with good thermal stability maintain high hardness and strength under high temperature conditions. Therefore, it is required that in a high-temperature working environment, the second phase is precipitated and the second phase is fine and disp...

Embodiment 2

[0035] The chemical composition of the overlay welding alloy D3 used in the present embodiment is as shown in table 1:

[0036] Table 1 Design composition (%) of surfacing alloy D3

[0037]

[0038]

[0039] 1) The role of each element in the alloy

[0040] During the heating and heat preservation process of metal materials, there will be two changes: one is the transformation of retained austenite into martensite, and the other is the aggregation, growth and precipitation of alloy elements, resulting in secondary hardening. Obviously, under the thermal stability test process, if the material can maintain a high "secondary hardening" performance, it will have high thermal stability.

[0041]The alloying element W is a strong carbide-forming element. In the temperature range of 500 ° C to 600 ° C, martensite decomposes and precipitates W, C and WC carbides. This type of carbide has a high melting point and high thermal stability. It is difficult to dissolve into solid s...

Embodiment 3

[0055] Performance Testing:

[0056] A total of 21 samples were prepared, of which 2 were the original samples in the surfacing state, 15 were heat-treated samples, and the remaining 4 were used as spares, and all of them were clearly marked.

[0057] 1. For hardness analysis, use a Rockwell hardness tester. The type of indenter used in the test is a diamond cone, and the scale is HRC. The Rockwell hardness value is calculated based on the indentation depth h. The larger the H value, the lower the hardness value; otherwise, the higher the Rockwell hardness value is calculated: HR=(k-h) / 0.002, k is 0.2mm .

[0058] 2. Metallographic analysis: erode or rub the polished sample surface in a chemical etchant until the surface loses luster. The chemical etchant is triacid ethanol, and its composition is: 10% nitric acid, 25% hydrochloric acid, % ethanol, 15% supersaturated picric acid, take metallographic photos after 4-5 minutes of corrosion, and then analyze the structure and ph...

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Abstract

The invention discloses a stacking heat treatment process of an iron-based high temperature alloy and a performance research, and belongs to the field of ferroalloy processing. The iron-based high temperature alloy D3 is selected as a stacking material, the iron-based high temperature alloy is subjected to heat treatment through aging treatment with different temperatures and times, and organization and performance change laws of the D3 iron-based high temperature alloy subjected to heat treatment at different temperatures are studied through hardness analysis, metallographic analysis and X-ray diffraction analysis, the aging hardness of the D3 after heat treatment at different temperatures is higher than that of original stacking welding; the hardness value of the D3 aged at 750 DEG C for10 h is the maximum, and M6C and Laves phases of the D3 are the primary strengthening phases; when the working temperature is 700-800 DEG C, the thermal stability propertyof the D3 can be obviously better than that of H13 and 3Cr2W8V. The D3 has good thermal stability.

Description

technical field [0001] The invention belongs to the technical field of heat treatment of iron-based superalloys, and in particular relates to an iron-based superalloy stacking heat treatment process and performance research thereof. Background technique [0002] Iron-based superalloys are special alloys based on iron and alloyed with various elements to improve their high-temperature mechanical properties and high-temperature corrosion resistance. Compared with nickel-based and cobalt-based superalloys, iron-based superalloys are inexpensive, and are widely used in high-temperature structural materials in the fields of national defense, energy, aviation, and nuclear reactions. [0003] Hot work die steel is a metal material for manufacturing hot work dies (hot forging dies, hot forging dies, hot extrusion dies and die-casting dies, etc.). This type of mold is in contact with hot metal during work, and the surface of the mold cavity will be heated to 300-400°C (hot forging d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D6/00C22C38/02C22C38/04C22C38/44C22C38/46B23P15/00
CPCB23P15/00C21D6/004C21D6/005C21D6/008C22C38/02C22C38/04C22C38/44C22C38/46
Inventor 夏建强李选泽汤翔林
Owner 安徽恒利增材制造科技有限公司
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