| IN SITU OBSERVATION OF DEFORMATION AND FRACTURE FOR SUPERALLOY GH169 UNDER COMBINED FATIGUE-CREEP ACTION |
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| 作者姓名： | TIAN Changsheng WANG Minsheng HOU Tiecui DANG Xin'an Northwestern Polytechnical University.Xi'an China Associate Professor |
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| 作者单位： | TIAN Changsheng WANG Minsheng HOU Tiecui DANG Xin'an Northwestern Polytechnical University.Xi'an，China Associate Professor，Department of Materials Science and Engineering，Northwestern Polytechnical University，Xi'an 710072，China |
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| 摘 要： | In Situ observation of deformation and fracture for superalloy GH169 under combinedfatigue-creep action is made by using high temperature metalloscope,it is shown that underthe test conditions the deformution takes place by merely of slipping,twinning and grainhoundary sliding,and the mode of failure depends on the microstructure of specimen.lntergranular cracks arise.from W-type voids produced by the stress concentration at triplepoint which could not be relaxed by the interior deformation of grains and the localdeformathm region along grain bounaries.And the crack propagation mechanism is thenucleation,growth and linkage of carities at the grain boundaries.Transgranular cracks formfrom deformatiom damages within the grain,and its propagation mechanism is shear rupturealong the slip phme.
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| 收稿时间： | 1993-04-25 |
| 修稿时间： | 1993-04-25 |
IN SITU OBSERVATION OF DEFORMATION AND FRACTURE FOR SUPERALLOY GH169 UNDER COMBINED FATIGUE-CREEP ACTION |
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| TIAN Changsheng WANG Minsheng HOU Tiecui DANG Xin''''an Northwestern Polytechnical University.Xi''''an,China Associate Professor,.IN SITU OBSERVATION OF DEFORMATION AND FRACTURE FOR SUPERALLOY GH169 UNDER COMBINED FATIGUE-CREEP ACTION[J].Acta Metallurgica Sinica(English Letters),1993,6(2):101-106. |
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| Authors: | TIAN Changsheng WANG Minsheng HOU Tiecui DANG Xin'an Northwestern Polytechnical UniversityXi'an China Associate Professor |
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| Affiliation: | TIAN Changsheng WANG Minsheng HOU Tiecui DANG Xin'an Northwestern Polytechnical University.Xi'an,China Associate Professor,Department of Materials Science and Engineering,Northwestern Polytechnical University,Xi'an,China |
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| Abstract: | In Situ observation of deformation and fracture for superalloy GH169 under combined fatigue-creep action is made by using high temperature metalloscope,it is shown that under the test conditions the deformution takes place by merely of slipping,twinning and grain houndary sliding,and the mode of failure depends on the microstructure of specimen. lntergranular cracks arise.from W-type voids produced by the stress concentration at triple point which could not be relaxed by the interior deformation of grains and the local deformathm region along grain bounaries.And the crack propagation mechanism is the nucleation,growth and linkage of carities at the grain boundaries.Transgranular cracks form from deformatiom damages within the grain,and its propagation mechanism is shear rupture along the slip phme. |
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| Keywords: | combined fatigue-creep action deformation fracture superalloy GH169 |
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