用透射电子显微镜,观察到合金标准热处理和长期时效后晶内VC的明晰图象,借助VC中的波纹图,测定了其尺寸,并测量计算了它们同奥氏体的错配度;在长期时效试样中观察到M_(23)C_6的VC包层;研究了晶内M_(23)C_6孪晶同奥氏体的共格关系及其共格界面。
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.
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