热暴露下预应变对CMSX-4单晶高温合金的显微组织演变的影响.pdf

Availableonlineat、^n^n^，．sciencedirect．com 一 Transactionsof 嘞 ScienceDirect NonferrousM etals 黉 SocietyofChina ELSEⅥ ER Press Trans．NonferrousMet．Soc．China211296 www ．tnm sc．cn Effectofpre—strainonmicrostructuralevolutionduringthermalexposureof singlecrystalsuperalloyCMSX一4 B．G．CHOI，C．Y．JO，H．U．HONG，I．S．KIM ，S．M ．SEO，H．M ． M HighTemperatureMaterialsGroup，KoreaInstiutteofMaterialsScience， 797Changwondaero，Changwon641—010，Korea Received23September2010；accepted16December2010 Abstract：Compressiveandtensilepre—strainsatroom temperaturewereinducedinthesecondgenerationsinglecrystalsuperalloy CMSX一4fullyheattreated．Bothcompressiveandtensilepre—straingeneratedshearbandsinthesinglecrystalCMSX·4．Thermal exposurefor10hat950。C ontheDrestrainedsinglecrystalCMSX一4developedpreferentialcoarseningofyparticlesalongthe shearbands． particlesontheshearbandgraduallyinvadedychanne1．Finally，theychannelsalongtheshearbanddisappeared- TCP—likeparticlesappearedattheexpenseofychanneldisappearance．However，thermalexposurefor10hofthenomr alsingle crystalCM SX一4 didnotdevelop TCP precipitation orpreferentialcoarseningofyparticles．Thermalexposureofr100h of pre—strainedCMSX一4developedpreferentialcoarseningofyandTCPphaseparticlesalongtheshearbandsaswellascoarseningof yparticlesinthematrix． Keywords：pre—strain；microst