| Carbide Effects on Creep Crack Growth of Ni-Cr Austenitic Steels |
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| 作者姓名： | 祝苏明 朱世杰 王富岗 张俊善 |
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| 作者单位： | Dalian University of Technology Dalian，116024，China，Institute of Metal Research，Academia Sinica，Shenyang，110015，China，Dalian University of Technology，Dalian，116024，China，Dalian University of Technology，Dalian，116024，China |
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| 摘 要： | 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.
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| 收稿时间： | 1992-11-28 |
Carbide Effects on Creep Crack Growth of Ni-Cr Austenitic Steels |
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| ZHU Suming ZHU Shijie WANG Fugang ZHANG Junshan Dalian University of Technology,Dalian,China Institute of Metal Research,Academia Sinica,Shenyang,China To whom correspondence should be addressed.Carbide Effects on Creep Crack Growth of Ni-Cr Austenitic Steels[J].Journal of Materials Science & Technology,1992,8(6):391-396. |
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| Authors: | ZHU Suming ZHU Shijie WANG Fugang ZHANG Junshan Dalian University of Technology Dalian China Institute of Metal Research Academia Sinica Shenyang China To whom correspondence should be addressed |
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| Abstract: | 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. |
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| Keywords: | Ni-Cr austenitic steel creep crack growth carbide |
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