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A high temperature steam turbine blade and its production method

A steam turbine blade, high temperature technology, applied in the field of mechanical materials, can solve the problems of high temperature lasting low life, mixed crystal structure and other problems

Active Publication Date: 2020-10-23
SICHUAN JIANGYOU LIUHE STEAM TURBINE MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a high-temperature steam turbine blade and its production method in view of the above-mentioned problems. By adjusting the feed formula and improving the production method, the existing high-temperature blade steel has mixed crystal structure and low high-temperature durable life. The technical problems of the high-temperature blades produced by this method have greatly improved the uniformity of the material structure, which can effectively reduce the degree of mixed crystals and improve the durable life.

Method used

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  • A high temperature steam turbine blade and its production method
  • A high temperature steam turbine blade and its production method
  • A high temperature steam turbine blade and its production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Prepare high-temperature steam turbine blades according to the following components and methods,

[0029] Step A, carry out vacuum induction smelting according to the composition ratio, in which C element is 0.06%, Cr element is 19.5%, Al element is 1.55%, Ti element is 2.60%, and Ni element balance is carried out at 1470-1500°C. It is 0.5pa, and the refining time is 60min.

[0030] Step B, electroslag remelting is carried out on the electrode rod obtained in step A, the electroslag remelting process controls the melting rate at 4.5kg / min, and the outlet water temperature is 46-52°C;

[0031] Step C, subjecting the steel ingot obtained in step B to high-temperature homogenization treatment, the homogenization treatment temperature is 1120°C, and the heat preservation is ≥ 20h,

[0032] In step D, the temperature of the steel ingot obtained in step C is lowered to 1130° C., and after being kept for 3 hours, cross forging is used at this temperature to form a material. ...

Embodiment 2

[0035] Prepare high-temperature steam turbine blades according to the following components and methods:

[0036] Step A, vacuum induction smelting is carried out according to the composition ratio, in which C element is 0.053%, Cr element is 20.5%, Al element is 1.58%, Ti element is 2.55%, and Ni element balance is carried out at 1470-1500°C for casting electrode rods; vacuum degree 0.5pa, refining time 60min;

[0037] Step B, electroslag remelting is carried out on the electrode rod obtained in step A, the electroslag remelting process controls the melting rate at 4.5kg / min, and the outlet water temperature is 46-52°C;

[0038] Step C, subjecting the steel ingot obtained in step B to high-temperature homogenization treatment, the homogenization treatment temperature is 1120°C, and the heat preservation is ≥ 20h;

[0039] In step D, the temperature of the steel ingot obtained in step C is lowered to 1130° C., and after being kept for 3 hours, the steel ingot obtained in step ...

Embodiment 3

[0042] Prepare high-temperature steam turbine blades according to the following components and methods:

[0043] Step A, vacuum induction smelting is carried out according to the composition ratio, wherein C element is 0.065%, Cr element is 19.5%, Al element is 1.65%, Ti element is 2.60%, and Ni element balance is carried out at 1470-1500°C. It is 0.7pa, and the refining time is 60min.

[0044] In step B, electroslag remelting is performed on the electrode rod obtained in step A, and the electroslag remelting process controls the melting rate at 4.0kg / min, and the outlet water temperature is 46-52°C;

[0045] Step C, subjecting the steel ingot obtained in step B to high-temperature homogenization treatment, the homogenization treatment temperature is 1190-1210°C, and the heat preservation is ≥ 20h;

[0046] In step D, the temperature of the steel ingot obtained in step C is lowered to 1130° C., and after being kept for 3 hours, the steel ingot obtained in step C is formed by cr...

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Abstract

The invention discloses a high-temperature turbine blade and a production method of the turbine blade. The turbine blade comprises the following chemical ingredients by mass percentage: 0.05-0.068% ofC, 19-21% of Cr, 1.50-1.65% of Al, 2.5-2.6% of Ti and the balance of Ni. The turbine blade is prepared by performing vacuum induction smelting and casting on the ingredients to form an electrode bar,and performing electroslag remelting, high temperature homogenization treatment and forging. According to the blade, contents of the preparation ingredients are optimized; on the premise of reducingthe content of C in the raw material ingredients, the segregation is reduced, and a crystallization direction can be effectively controlled at the same time by performing electroslag remelting treatment, selecting an appropriate electroslag remelting slag system and controlling electroslag remelting parameters; a crystallization structure in an alloy is improved by the homogenization treatment; casting stress is removed; the segregation is reduced; the uniformity of the structure can be further improved; and a forging deformation amount of a finished product is increased by cross forging.

Description

technical field [0001] The invention relates to the field of mechanical materials, in particular to a high-temperature steam turbine blade and a production method thereof. Background technique [0002] With the increase of my country's electricity consumption, the continuous display of new ships and the development of my country's steam turbine manufacturing technology, steam turbines are widely used in power stations, ships and other fields. Strict, especially at present, higher requirements are put forward for production cost and service life. A steam turbine is a rotary fluid power machine that converts the heat energy of steam or gas into mechanical energy, and the blade is one of the most precise and important key parts of the steam turbine. The working environment of steam turbine blades is complex and changeable. Under extremely harsh conditions, it bears the combined effects of high temperature, high pressure, huge centrifugal force, steam force, steam excitation for...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/00C21D6/00C21D9/00C22B9/18C22C33/04C22C38/06C22C38/50
CPCC21D1/00C21D6/004C21D9/0068C22B9/18C22C33/04C22C38/06C22C38/50Y02P10/25
Inventor 周江波雷德江粟硕
Owner SICHUAN JIANGYOU LIUHE STEAM TURBINE MATERIAL
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