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A heat treatment method for precipitation hardened blade steel

A heat treatment method, precipitation hardening technology, applied in the field of thermal processing of turbine blades, can solve problems such as large deformation, achieve small deformation, qualified size, and solve the effect of large deformation

Active Publication Date: 2018-05-01
WUXI TURBINE BLADE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of this, the present invention provides a heat treatment method for precipitation hardened blade steel, which effectively solves the problem of large deformation caused by secondary solution heat treatment, and adopts the heat treatment method to produce forgings with small deformation, qualified size and excellent performance

Method used

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  • A heat treatment method for precipitation hardened blade steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Put 600 pieces of precipitation-hardened blade steel with the composition of 0Cr17Ni4Cu4Nb into the furnace, raise the temperature to 850°C for medium temperature heating, and keep it warm for 2 hours. Air cooling out of the furnace to produce forgings.

Embodiment 2

[0016] The composition is 0Cr17Ni4Cu4Nb 500 pieces of precipitation hardened blade steel are loaded into the furnace, the temperature is raised to 800°C for medium temperature heating, and kept for 3 hours, and after being released from the furnace, thermal correction is carried out on the corresponding mold, aging treatment is carried out at 500°C, and kept for 5 hours, Air cooling out of the furnace to produce forgings.

Embodiment 3

[0018] Put 600 pieces of X4CrNiCuMo14-5 precipitation hardened blade steel into the furnace, raise the temperature to 900°C for medium temperature heating, and keep it warm for 2 hours. After 4 hours, it was taken out of the furnace and air-cooled to obtain a forging.

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Abstract

The invention discloses a heat treatment method for precipitation hardening vane steel, which comprises the following steps: (1) carrying out intermediate-temperature heating on the precipitation hardening vane steel at the temperature of 800-950 DEG C, and preserving heat for 1-3h; (2) after being discharged, putting the precipitation hardening vane steel onto a die for thermal calibration; and (3) carrying out aging treatment and discharging for air cooling. The heat treatment method can get rid of solution treatment, and can carry out optimizing processing on temperature and time for intermediate-temperature heating and aging treatment, thus effectively solving the problem of large deformation caused by secondary solution heat treatment; and a forged piece obtained by adopting the heat treatment method is small in deformation, qualified in dimension and excellent in performance.

Description

technical field [0001] The invention relates to the technical field of turbine blade thermal processing, in particular to a heat treatment method for precipitation hardened blade steel. Background technique [0002] Precipitation-hardened stainless steel is widely used in the field of large forgings of turbine blades, and the deformation of forgings is a major difficulty in the manufacture of large forgings of turbines. For example, cold correction of deformation after heat treatment of some forgings cannot be realized. Usually, the heat treatment method for repair is repeated heat treatment: solid solution + medium temperature adjustment + cold correction + aging. Due to the high solid solution temperature (990-1050°C), the deformation after the secondary heat treatment is relatively large, resulting in product scrapping. Contents of the invention [0003] In view of this, the present invention provides a heat treatment method for precipitation hardened blade steel. The ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/00
CPCC21D8/005
Inventor 刘新权
Owner WUXI TURBINE BLADE
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