GH36合金中的VCM23C6和高温持久缺口敏感性

Precipitates of VC M23C6 and Stress Rupture Notch Sensitivity of Superalloy GH36

    摘要
  • 摘要: 使用薄膜TEM直接观察了成分相近热处理制度不同的两个炉号GH36合金的基本组织,使用SAD和DF技术做物相分析。结果表明,合金经正常热处理后析出细小弥散分布的VC,尺寸约在2nm～12nm,还有M23C6和N6C、其中VC和M23C6与合金基体的取向关系是011vc∥011M∥011M23C6,（111）VC∥（111）M∥（111）M23C6,（200）VC∥（200）M∥（200）M23C6,通过补充时效后合金中VC颗粒聚集长大,晶界析出的M23C6更多,这种组织及晶界状态有利于改善合金的持久缺口敏感性。

     

    Abstract: The structure analyses of two GH36 superalloy turbine disks with different heat treatments were conducted by thin foil TEM. The preci-tates in GH36 super alloy were identified as VG, M23C6 and NbC by SAD. Electron diffraction patterns show the orintation relationship between precipitates and matrix as following:\\beginarrayl\rm011_\rmvc\rm||011\rm_\rmM\rm||011\rm_\rmM_\rm23\rmC_\rm6\\\rm111_\rmvc\rm||111\rm_\rmM\rm||111\rm_\rmM_\rm23\rmC_\rm6\\\rm200_\rmvc\rm||200\rm_\rmM\rm||200\rm_\rmM_\rm23\rmC_\rm6\endarray\Moire patterns and dark field show that the size of VC precipitates after normal heat treatment varies from 3 to 12nm. The size of VC after superimposed higher temperature aging grows in a few nm larger and more M23C6 carbide precipitates in alloy than norma heat treatment. Thus, the yield stress and stress rupture strength decrease, but the stress rupture notch sensitivity has been improved.

     

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