Heat process capable of lowering ductile-brittle transition temperature and intergranular fracture ratio of turbine blades

A technology of ductile-brittle transition temperature and intergranular fracture, applied in heat treatment furnaces, heat treatment equipment, heat treatment process control, etc. The temperature and intergranular fracture ratio are high, and the process effect is easily affected by the chemical composition of the raw material of the blade.

Active Publication Date: 2013-06-19
WUXI TURBINE BLADE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the above problems, the present invention provides a heat treatment process for reducing the ductile-brittle transition temperature and the intergranular fracture ratio of turbine blades, which can effectively avoid the process effect being easily affected by the chemical properties of the blade raw materials when the existing sub-temperature annealing process is used to treat the turbine blades. It can solve the problem of the influence of components, and can solve the problem of high ductile-brittle transition temperature and intergranular fracture ratio of the blade caused by the high temperature residence time of the blade in the heat treatment process in the existing sub-temperature annealing process

Method used

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  • Heat process capable of lowering ductile-brittle transition temperature and intergranular fracture ratio of turbine blades
  • Heat process capable of lowering ductile-brittle transition temperature and intergranular fracture ratio of turbine blades
  • Heat process capable of lowering ductile-brittle transition temperature and intergranular fracture ratio of turbine blades

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Experimental program
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Effect test

Embodiment 1

[0008] (1) Choose X20Cr13 material blades, put the blades evenly into the general quenching basket according to the process plan, and then put the quenching basket into the heat treatment quenching furnace;

[0009] (2) The first quenching: the quenching temperature is 980°C, the heat preservation is 3 hours, the cooling rate is 30°C / min, and the quenching cooling medium is air;

[0010] (3) Second quenching: quenching temperature 960°C, heat preservation for 100 minutes, cooling rate 40°C / min, and oil as quenching medium;

[0011] Compared with the conventional process, the ductile-brittle transition temperature (FATT 50 ) and intergranular fracture ratio are shown in Table 1.

[0012]

Embodiment 2

[0014] (1) Choose blades made of X20Cr13 material, put the blades evenly into the general quenching basket according to the process plan, and then put the quenching basket into the heat treatment quenching furnace;

[0015] (2) The first quenching: the quenching temperature is 1020°C, heat preservation is 2 hours, the cooling rate is 50°C / min, and the quenching cooling medium is water;

[0016] (3) Second quenching: quenching temperature 980°C, heat preservation for 15 minutes, cooling rate 40°C / min, and oil as quenching medium;

[0017] Compared with the conventional process, the ductile-brittle transition temperature (FATT 50 ) and intergranular fracture ratio are shown in Table 2.

[0018]

Embodiment 3

[0020] (1) Choose blades made of X20Cr13 material, put the blades evenly into the general quenching basket according to the process plan, and then put the quenching basket into the heat treatment quenching furnace;

[0021] (2) The first quenching: the quenching temperature is 1030°C, the heat preservation is 1 hour, the cooling rate is 30°C / min, and the quenching cooling medium is air;

[0022] (3) The second quenching: the quenching temperature is 950°C, the heat preservation is 30 minutes, the cooling rate is 50°C / min, and the quenching cooling medium is water;

[0023] Compared with the conventional process, the ductile-brittle transition temperature (FATT 50 ) and intergranular fracture ratio are shown in Table 3.

[0024]

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Abstract

The invention provides a heat treatment process for reducing the ductile-brittle transition temperature and the intergranular fracture ratio of turbine blades, which can effectively avoid the problem that the process effect is easily affected by the chemical composition of blade raw materials when the existing sub-temperature annealing process is used to treat turbine blades , and can solve the problem of high ductile-brittle transition temperature and intergranular fracture ratio of the blade caused by the blade staying at high temperature for too long in the existing sub-temperature annealing process. Put the blades evenly into the general quenching basket according to the process plan, and then put the quenching basket into the heat treatment quenching furnace, which is characterized in that: the blades are quenched twice in the quenching furnace, and the first quenching temperature is 980℃~1070℃, heat preservation for 1 hour to 3 hours, cooling rate 20℃ / minute~50℃ / minute, the second quenching temperature is 900℃~1000℃, heat preservation for 15 minutes~120 minutes, cooling rate 30℃ / minute ~50°C / min, and ensure that the first quenching temperature is 20°C to 100°C higher than the second quenching temperature.

Description

technical field [0001] The invention relates to the field of heat treatment technology for turbine blades, in particular to a heat treatment technology for reducing the ductile-brittle transition temperature and intergranular fracture ratio of turbine blades. Background technique [0002] ductile-brittle transition temperature (FATT 50 ) and the intergranular fracture ratio are important indicators for evaluating turbine blades. Usually in an environment with low climate temperature, if the ductile-brittle transition temperature (FATT 50 ) is too high, the turbine blades are prone to brittle fracture when starting and stopping, and if the intergranular fracture ratio is too high during high temperature operation, the grain boundary strength of the turbine blade will decrease and cause blade failure. At present, the production of turbine blades mostly adopts the conventional sub-temperature annealing process, that is, first undergoes furnace annealing at 880°C~920°C, and the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/18C21D9/00C21D11/00
Inventor 刘新权李湘军徐大懋
Owner WUXI TURBINE BLADE
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