INTRAGRANULAR VC AND M_(23)C_6 IN GH36 SUPERALLOY
GH36合金晶内VC和M23C6相

An observation under TEM was carried out on the distinct images ofthe intragranular VC in the foils of an GH36 superalloy after normal heat treatmentand long-term aging. The size of VC was measured by means of the Moire pattern.The misfit between VC and austenite was also accurately calculated. The M_(23)C_6 en-voloped in VC shell was observed in the long-term aged specimens. The coherentrelation between the intragranular M_(23)C_6 twin and austenite as well as its coherentinterface were studied. The effects of the intragranular precipitation and of thegrain boundary phases in the superalloy on its stress rupture of life were alsodiscussed.