| IN-SITU OBSERVATION OF CRACK TIP DEFORMATION IN A DUPLEX STAINLESS STEEL |
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| 引用本文： | YAO Kefu TANG Naiyong CHEN Nanping Tsinghua University,Beijing,China [Originally published in ACTA METALL SIN(CHINESE EDN)() pp A—A,Ph.D.Student,Dept.of Materials Sci.and Eng.,Tsinghua University,Beijing,China. IN-SITU OBSERVATION OF CRACK TIP DEFORMATION IN A DUPLEX STAINLESS STEEL[J]. 金属学报(英文版), 1989, 2(6): 433-438 |
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| 作者姓名： | YAO Kefu TANG Naiyong CHEN Nanping Tsinghua University Beijing China [Originally published in ACTA METALL SIN(CHINESE EDN)() pp A—A Ph.D.Student Dept.of Materials Sci.and Eng. Tsinghua University Beijing China |
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| 作者单位： | YAO Kefu TANG Naiyong CHEN Nanping Tsinghua University，Beijing，China [Originally published in ACTA METALL SIN(CHINESE EDN)25(3)1989 pp A213—A218，Ph.D.Student，Dept.of Materials Sci.and Eng.，Tsinghua University，Beijing，China |
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| 摘 要： | The development of dislocation structures in the plastic zone ahead of a crack tip has been in-vestigated in a duplex stainless steel during in-situ deformation experiments in a scanningtransmission electron microscope.It was found that the dislocation distribution wassignificantly different in the ferrite and in the austenite.In the ferrite grains,the dislocationsemitted by the crack tip may cross-slip out of the original slip planes and form a broad plasticzone.However,in the austenite,the dislocation free zone is small and the dislocations emittedby the crack pile up in its slip plane.The selection of slip systems at the crack tip depends onthe crack tip Schmid factors in both phases.But after large deformation,the selection of thesecond slip systems at the craek tip in austenite does not depend on the Schmid factors.
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| 收稿时间： | 1989-12-25 |
| 修稿时间： | 1989-12-25 |
IN-SITU OBSERVATION OF CRACK TIP DEFORMATION IN A DUPLEX STAINLESS STEEL |
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| YAO Kefu TANG Naiyong CHEN Nanping Tsinghua University,Beijing,China [Originally published in ACTA METALL SIN. IN-SITU OBSERVATION OF CRACK TIP DEFORMATION IN A DUPLEX STAINLESS STEEL[J]. Acta Metallurgica Sinica(English Letters), 1989, 2(6): 433-438 |
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| Authors: | YAO Kefu TANG Naiyong CHEN Nanping Tsinghua University Beijing China [Originally published in ACTA METALL SIN |
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| Abstract: | The development of dislocation structures in the plastic zone ahead of a crack tip has been in- vestigated in a duplex stainless steel during in-situ deformation experiments in a scanning transmission electron microscope.It was found that the dislocation distribution was significantly different in the ferrite and in the austenite.In the ferrite grains,the dislocations emitted by the crack tip may cross-slip out of the original slip planes and form a broad plastic zone.However,in the austenite,the dislocation free zone is small and the dislocations emitted by the crack pile up in its slip plane.The selection of slip systems at the crack tip depends on the crack tip Schmid factors in both phases.But after large deformation,the selection of the second slip systems at the craek tip in austenite does not depend on the Schmid factors. |
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| Keywords: | crack tip dislocation configuration Schmid factor duplex strainless steel |
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