J. Mater. Sci. Technol. ›› 1992, Vol. 8 ›› Issue (6): 391-396.
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Carbide Effects on Creep Crack Growth of Ni-Cr Austenitic Steels
ZHU Suming ZHU Shijie WANG Fugang ZHANG Junshan ** Dalian University of Technology,Dalian,116024,China*** Institute of Metal Research,Academia Sinica,Shenyang,110015,China+ To whom correspondence should be addressed
- DalianUniversityofTechnology,Dalian,116024,China;InstituteofMetalResearch,AcademiaSinica,Shenyang,110015,China;DalianUniversityofTechnology,Dalian,116024,China;DalianUniversityofTechnology,Dalian,116024,China
Carbide Effects on Creep Crack Growth of Ni-Cr Austenitic Steels
ZHU Suming ZHU Shijie WANG Fugang ZHANG Junshan ** Dalian University of Technology,Dalian,116024,China*** Institute of Metal Research,Academia Sinica,Shenyang,110015,China+ To whom correspondence should be addressed
摘要： <正> By controlling the carbon content ofFe-15Cr-25Ni alloys,three types ofmicrostructures were obtained:single phaseaustenite (γ),γ+intergranular carbides,γ+intergranular carbides + intragranular carbides.Creep crack growth behaviour of the three alloyshas been compared at 973 K and 1123 K.Intergranular carbides show higher creep crackgrowth resistance than intragranular carbides.Cav-ities nucleate at the triple junctions of grain bound-aries for single phase alloy,but at intergranularcarbides for two-phase alloys.The precipitation ofintergranular carbide not only changes thenucleation mechanism of cavities,but also inhibitsthe growth and coalescence of cavities.The precipi-tation of intragranular carbide obstructs thenucleation and growth of cavities furthermore.