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Deformation machining process for nickel based alloys and iron nickel based alloys

An iron-nickel-based alloy and nickel-based alloy technology, which is applied in the field of alloy deformation processing technology, can solve the problems of reducing permanent strength, easy cracking and high strength, and achieve the effects of high plasticity and toughness, reducing permanent strength and low yield strength.

Active Publication Date: 2014-04-09
XIAN THERMAL POWER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The object of the present invention is to provide a solution that can solve the problem of cold bending of nickel-based alloys and iron-nickel-based alloy boiler tubes in a solid solution state to reduce the precipitation of carbides at the grain boundaries of the material, thereby reducing the durable strength, and the plasticity of cold bending in the aging state. Low strength, high strength, difficult deformation and easy cracking, so as to improve the deformation processing technology of nickel-based alloys and iron-nickel-based alloys for the durable strength of nickel-based alloys and iron-nickel-based alloys

Method used

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  • Deformation machining process for nickel based alloys and iron nickel based alloys
  • Deformation machining process for nickel based alloys and iron nickel based alloys
  • Deformation machining process for nickel based alloys and iron nickel based alloys

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Comparative sample 1: 1150 ° C × 1 hour solid solution water cooling, hardness HB168, R p0.2 It is 314MPa.

[0042] Comparative sample 2: 1150℃×1 hour solid solution water cooling + 800℃×16 hours aging air cooling, hardness increased to HB304, R p0.2 It is 728MPa, the strength and hardness are too high, and it is not suitable for deformation processing.

[0043] As a comparison with the heat treatment state before deformation processing in the above two existing processes, heat treatment tests at different temperatures were carried out on the materials.

[0044] Comparative sample 3: 1150°C x 1 hour solid solution water cooling + 700°C x 4 hours heat treatment and air cooling. The hardness of comparative sample 3 after heat treatment is HB268, and the microstructure photo is shown in figure 2 , due to the low temperature, no carbide precipitated at the grain boundary.

[0045] Comparative sample 4: 1150°C x 1 hour solid solution water cooling + 850°C x 2 hours heat...

Embodiment 2

[0050] Endurance strength tests under three conditions were carried out on Inconel 740H.

[0051] Comparative sample 5: It is a standard heat treatment material (1150°C×1 hour solid solution water cooling + 800°C×16 hours aging air cooling), and it is processed into a durable strength sample. The high temperature durable strength test is carried out at 750°C and 292MPa, and the fracture time is 503 hours . Figure 7 This is the microstructure photo of the permanent fracture sample away from the fracture area, and there are obvious carbides in the grain boundary.

[0052] Comparative sample 6: Adopt the conventional process of the existing deformation processing technology, that is, carry out 11% cold deformation on the material cooled by solid solution water at 1150°C×1 hour, and then perform aging treatment at 800°C×16h, and process it into a durable strength sample The high-temperature endurance strength test was carried out at 750°C and 292MPa, and the rupture time was 380...

Embodiment 3

[0055] Process example sample 5 according to the process disclosed in the present invention, that is, carry out an intermediate heat treatment at 1010 ° C × 2 hours for the material cooled by solid solution water at 1150 ° C × 1 hour, R p0.2 It is 455MPa, followed by 13% cold deformation, and then aging treatment at 790°C×8h, processed into a durable strength sample for high-temperature durable strength test at 750°C and 292MPa, and the fracture time is 582.6 hours. Even though the amount of deformation is greater than that of Comparative Sample 6, its life is still longer than that of Comparative Sample 6, even higher than that of Comparative Sample 5 without deformation processing.

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Abstract

The invention discloses a deformation machining process for nickel based alloys and iron nickel based alloys, and is used for solving the technical problems that the deformation machining of the nickel based alloys and the iron nickel based alloys in a solid solution state lowers the amount of crystal boundary carbide precipitation of materials in subsequent aging or serving process, thereby reducing the endurance strength, and the nickel based alloys and the iron nickel based alloys are low in plasticity, high in strength, difficult to deform and easy to crack when being subjected to deformation machining in an aging state. The process is technically characterized in that the nickel based alloys and the iron nickel based alloys subjected to solid solution treatment are subjected to one relatively-high-temperature heat treatment, carbides are precipitated near a crystal boundary firstly and simultaneously the precipitation of intracrystalline gamma' or gamma'' phases is reduced, then the obtained objects are subjected to deformation machining until the objects reach the required shape and size of parts, and finally, the obtained products are subjected to aging treatment, so that both the process properties of materials in the stage of deformation machining are ensured, and the final endurance strength of products is ensured.

Description

technical field [0001] The invention relates to an alloy deformation processing technology, in particular to a deformation processing technology for a nickel-based alloy and an iron-nickel-based alloy. Background technique [0002] With the international emphasis on environmental protection, the thermal power industry is facing increasing CO 2 The pressure to reduce emissions of greenhouse gases and pollutants such as SOx and NOx, and the market competition faced by the thermal power industry is also intensifying, all of which require power plants to further reduce power generation costs. The effective way to solve these problems is to improve the thermal efficiency of the thermal power generation unit, and improving the steam parameters of the unit is one of the most effective ways to improve the thermal efficiency. Thermal power plants in history have developed from low-voltage, medium-voltage, high-voltage, ultra-high-voltage, subcritical, and supercritical to the curren...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/10C21D8/00
Inventor 周荣灿唐丽英王博涵郭岩侯淑芳
Owner XIAN THERMAL POWER RES INST CO LTD
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