| CREEP CRACK PROPAGATION IN CONVENTIONAL CAST AND DIRECTIONALLY SOLIDIFIED SUPERALLOY RENE 80 |
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| 作者姓名： | SUN Jian ZHANG Yuanhu HU Gengxiang Shanghai Jiaotong University Shanghai China SUN Jian lecturer |
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| 作者单位： | SUN Jian ZHANG Yuanhu HU Gengxiang Shanghai Jiaotong University，Shanghai，China SUN Jian，lecturer，Department of Materials Science，Shanghai Jiaotong University，Shanghai 200030，China |
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| 摘 要： | The creep crack propagation in superalloy René80 of two different microstructures,i.e.,equiaxed grain structure by conventional casting and columnar grain by directionalsolidification,was investigated under static load at 1123 K.The creep crack growth rate,da/dt,seems to be correlated with the stress intensity factor,K.The creep crack growth ratein the directionally solidified alloy is lower than that in the conventional cast alloy,owing tothe elimination of transverse grain boundaries.The effect of microstructure on creep crackpropagation has also been discussed.
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| 关 键 词： | Superalloy René 80 directional solidification stress intensity factor creep crack propagation |
| 收稿时间： | 1993-10-25 |
| 修稿时间： | 1993-10-25 |
CREEP CRACK PROPAGATION IN CONVENTIONAL CAST AND DIRECTIONALLY SOLIDIFIED SUPERALLOY RENE 80 |
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| SUN Jian ZHANG Yuanhu HU Gengxiang Shanghai Jiaotong University,Shanghai,China SUN Jian,lecturer,.CREEP CRACK PROPAGATION IN CONVENTIONAL CAST AND DIRECTIONALLY SOLIDIFIED SUPERALLOY RENE 80[J].Acta Metallurgica Sinica(English Letters),1993,6(5):343-345. |
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| Authors: | SUN Jian ZHANG Yuanhu HU Gengxiang Shanghai Jiaotong University Shanghai China SUN Jian lecturer |
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| Affiliation: | SUN Jian ZHANG Yuanhu HU Gengxiang Shanghai Jiaotong University,Shanghai,China SUN Jian,lecturer,Department of Materials Science,Shanghai Jiaotong University,Shanghai,China |
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| Abstract: | The creep crack propagation in superalloy René80 of two different microstructures,i.e., equiaxed grain structure by conventional casting and columnar grain by directional solidification,was investigated under static load at 1123 K.The creep crack growth rate, da/dt,seems to be correlated with the stress intensity factor,K.The creep crack growth rate in the directionally solidified alloy is lower than that in the conventional cast alloy,owing to the elimination of transverse grain boundaries.The effect of microstructure on creep crack propagation has also been discussed. |
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| Keywords: | Superalloy René 80 directional solidification stress intensity factor creep crack propagation |
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