Method for preventing DD99 alloy single crystal blade from generating initial melting defect

A single crystal blade, DD99 technology, which is applied in the fields of investment precision casting and single crystal blade vacuum heat treatment, can solve the problems that have not been seen to solve the initial melting defect of DD99 alloy single crystal turbine blade, so as to avoid the initial melting defect and improve the initial melting defect. The effect of melting temperature

Active Publication Date: 2016-11-16
AECC AVIATION POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, there is no report on solving the problem of incipient melting defects in DD99 alloy single crystal turbine blades during heat treatment

Method used

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  • Method for preventing DD99 alloy single crystal blade from generating initial melting defect
  • Method for preventing DD99 alloy single crystal blade from generating initial melting defect

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Embodiment Construction

[0032] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0033] This embodiment is a method for preventing incipient melting defects from occurring in the working blade of a DD99 alloy single crystal high-pressure secondary turbine of an engine during vacuum solid solution treatment. The DD99 alloy single crystal high-pressure two-stage turbine working blade is a key part of an engine and a life-span part of the engine. The blade is a solid blade with a crown, the blade is slender, the chord width is relatively large, and the thickness of the exhaust edge is only 0.51mm.

[0034] When the blade does not add pretreatment in the solution treatment process, the blade body, edge plate and root surface of the blade have different degrees of incipient melting defects in the chemical inspection of the blade after solution treatment, which exceeds the requirements of the blade acceptance standard, resulting in blad...

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Abstract

The invention provides a method for preventing a DD99 alloy single crystal blade from generating an initial melting defect. The method comprises the steps that in a high-temperature heat treatment technology of the DD99 alloy single crystal blade, a pre-treatment technology is added, a temperature is taken between 10 DEG C and 25 DEG C below the treatment temperature during pre-treatment for thermal insulation, and therefore a low-melting-point eutectic phase inside an alloy is removed in advance. When blade high-temperature heat treatment is carried out after pre-treatment, due to the fact that the content of eutectic crystals inside the alloy is small, the initial melting temperature of the alloy is improved, and generation of the initial melting defect of the single crystal blade is avoided.

Description

technical field [0001] The invention relates to the fields of investment precision casting and vacuum heat treatment of single crystal blades, in particular to a method for preventing incipient melting defects of DD99 alloy single crystal turbine blades. Background technique [0002] DD99 is a nickel-based cast single crystal superalloy, which belongs to the first generation of single crystal superalloy. The alloy has low density, high creep strength and fatigue performance, good single crystal casting performance, wide solution treatment temperature range, and good structural stability. It is suitable for the manufacture of turbine working blades with complex inner cavities that work below 1050°C and guide vanes that work below 1100°C. [0003] Incipient melting refers to the low-melting intergranular or interdendritic phase formed by segregation during the solidification process of the alloy. In the subsequent heating process, the alloy undergoes a small amount of local m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/10C22F1/02
CPCC22F1/02C22F1/10
Inventor 张军寇录文方红文刘文娜吴娟利马李朝梁经纬宋建兵
Owner AECC AVIATION POWER CO LTD
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