Method and device for obtaining process parameters of nickel-based alloy pipe hot extrusion

A technology of process parameters and nickel-based alloys, which is applied in the field of pipe hot extrusion, can solve the problems of large consumption of tube blanks, high cost and waste of resources, and ineffective guidance.

Active Publication Date: 2020-03-17
NANJING INST OF TECH
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  • Description
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Problems solved by technology

The optimization methods for hot extrusion process parameters are mainly divided into two categories: the first category is to carry out actual trial extrusion on the extrusion equipment (trial and error method) to explore the optimal parameter combination. Extremely high cost and waste of resources; the second category is to use numerical simulation technology to simulate the extrusion process by computer and adjust the value of process parameters for optimization
At present, the research on optimizing the hot extrusion parameters of pipes by numerical simulation method is mainly aimed at the quality problems of single or partial waste pipes, and has not comprehensively analyzed the problems in actual production
Due to the interrelatedness and constraints of various quality problems, which involve material behaviors such as deformation, temperature rise, and phase change, the range of process parameters optimized for some quality problems is relatively wide, which cannot effectively guide actual production

Method used

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  • Method and device for obtaining process parameters of nickel-based alloy pipe hot extrusion
  • Method and device for obtaining process parameters of nickel-based alloy pipe hot extrusion
  • Method and device for obtaining process parameters of nickel-based alloy pipe hot extrusion

Examples

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Effect test

Embodiment 1

[0104] In this example, the numerical simulation method is used to optimize the hot extrusion process parameters of the nickel-based superalloy In740H alloy pipe.

[0105] The chemical composition weight percent of the superalloy In740H described in this example is C≤0.05%, Cr: 23-26%, Co: 19%-21%, Mo: 0.4-0.7%, Fe≤1.0%, Al : 0.8 to 1.6%, Ti: 1.0 to 2.0%, Nb: 1.0 to 2.0%, Ni: the balance.

[0106] According to purpose and working principle described in the present invention, concrete technical scheme is:

[0107] The high-temperature compression test samples were taken from the 1 / 2 radius of the In740H alloy forging rod and processed into a Φ8×12mm cylinder. The high-temperature compression test was carried out on a Gleeble thermal simulation testing machine, and the thermal compression temperatures were selected at 1000°C, 1050°C, 1100°C and 1150°C. ℃, the strain rate is selected as 0.1s-1, 1s-1 and 10s-1, the compression true strain is 0.16, 0.35, 0.7 and 0.9, a total of 48...

Embodiment 2

[0118] In this example, the numerical simulation method is used to optimize the hot extrusion process parameters of the nickel-based corrosion-resistant alloy In690 alloy pipe.

[0119] The chemical composition weight percent of the corrosion-resistant alloy In690 described in this embodiment is C≤0.05%, Cr: 27-31%, Fe: 7%-1.0%, Si≤0.5%, Cu≤0.5%, Ni: margin.

[0120] According to purpose and working principle described in the present invention, concrete technical scheme is:

[0121] The high-temperature thermal compression test sample is taken from the 1 / 2 radius of the In690 alloy forging rod and processed into a Φ8×12mm cylinder. The high-temperature compression test is carried out on the Gleeble thermal simulation testing machine, and the thermal compression temperature is 1050 ° C, 1100 ° C, 1150 ° C and 1200 ℃, the strain rate is selected as 0.1s-1, 1s-1 and 10s-1, the compression true strain is 0.16, 0.35, 0.7 and 0.9, a total of 48 sets of deformation conditions are ob...

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Abstract

The invention provides a method and a device for acquiring thermal extrusion technological parameters of a nickel base alloy tube stock. The method comprises the following steps: performing numerical simulation analysis for a thermal extrusion process of a tube blank on a thermal extrusion model, thereby acquiring an optimal criterion data of the tube blank under multiple sets of different thermal extrusion technological parameter alternative data; constructing a relation curve between each thermal extrusion technological parameter and the optimal criterion data and confirming a value interval of the thermal extrusion technological parameter corresponding to each optimal criterion datum according to the relation curve and a preset criterion selection condition; performing intersection treatment on the value intervals of the same thermal extrusion technological parameter corresponding to all the optimal criterion data, thereby acquiring optimal values of the thermal extrusion technological parameters. According to the invention, multiple technological parameters of the nickel base alloy tube stock in a thermal extrusion process can be more accurately acquired and the practical production can be more effectively guided.

Description

technical field [0001] The invention relates to the technical field of hot extrusion of pipes, in particular to a method and device for acquiring process parameters of hot extrusion of nickel-based alloy pipes. Background technique [0002] With the development of my country's energy industry and petrochemical industry, the demand for nickel-based alloy seamless pipes continues to increase, such as superheater tubes used in 700 ℃ ultra-supercritical thermal power plant boilers, oil well casings used in oil exploration, Heat transfer tubes of steam generators in nuclear power plants, etc. The production of nickel-based alloy seamless pipe is mainly through the process of hot extrusion combined with cold rolling, and the hot extrusion process is the core link of the whole production. As a special thermal deformation method, the three-dimensional compressive stress state in the extrusion deformation zone can improve the deformation capacity of the material, but due to the high ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20
CPCG06F30/20G06F2119/18
Inventor 王珏董建新张麦仓谢锡善
Owner NANJING INST OF TECH
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