ZHU Suming ZHU Shijie WANG Fugang ZHANG Junshan ** Dalian University of Technology
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Dalian
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116024
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China*** Institute of Metal Research
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Academia Sinica
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Shenyang
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110015
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China+ To whom correspondence should be addressed
材料科学技术（英文）
By controlling the carbon content of Fe-15Cr-25Ni alloys,three types of microstructures were obtained:single phase austenite (γ),γ+intergranular carbides, γ+intergranular carbides + intragranular carbides. Creep crack growth behaviour of the three alloys has been compared at 973 K and 1123 K. Intergranular carbides show higher creep crack growth resistance than intragranular carbides.Cav- ities nucleate at the triple junctions of grain bound- aries for single phase alloy,but at intergranular carbides for two-phase alloys.The precipitation of intergranular carbide not only changes the nucleation mechanism of cavities,but also inhibits the growth and coalescence of cavities.The precipi- tation of intragranular carbide obstructs the nucleation and growth of cavities furthermore.
关键词:
Ni-Cr austenitic steel
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