| CREEP DEFORMATION AND FRACTURE OF DZ40M DIRECTIONALLY SOLIDIFIED COBALT-BASE SUPERALLOY AT HIGH TEMPERATURE |
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| 作者姓名： | Jiang Wenhui Yao Xiangdong Guan Hengrong and Hu Zhuangqi Institute of Metal Research The Chinese Academy of Sciences Shenyang P. R. China Shenyang Polytechnic University Shenyang P. R. China |
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| 作者单位： | Jiang Wenhui，Yao Xiangdong，Guan Hengrong and Hu Zhuangqi Institute of Metal Research，The Chinese Academy of Sciences，Shenyang 110015，P. R. China Shenyang Polytechnic University，Shenyang 110023，P. R. China |
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| 摘 要： | １ＩＮＴＲＯＤＵＣＴＩＯＮＤＺ４０ＭａｌｏｙｉｓａｎｅｗｌｙｄｅｖｅｌｏｐｅｄｄｉｒｅｃｔｉｏｎａｌｙｓｏｌｉｄｉｆｉｅｄｃｏｂａｌｔｂａｓｅｓｕｐｅｒａｌｏｙｂａｓｅｄｏｎｃｏｎｖｅｎｔｉｏｎａｌＸ４０ａｌｏｙ．ＣｏｍｐａｒｅｄｗｉｔｈＸ４０ａ...
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CREEP DEFORMATION AND FRACTURE OF DZ40M DIRECTIONALLY SOLIDIFIED COBALT-BASE SUPERALLOY AT HIGH TEMPERATURE |
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| Jiang Wenhui,Yao Xiangdong,Guan Hengrong and Hu Zhuangqi Institute of Metal Research,The Chinese Academy of Sciences,Shenyang ,P. R. China Shenyang Polytechnic University,Shenyang ,P. R. China.CREEP DEFORMATION AND FRACTURE OF DZ40M DIRECTIONALLY SOLIDIFIED COBALT-BASE SUPERALLOY AT HIGH TEMPERATURE[J].Transactions of Nonferrous Metals Society of China,1999,9(2). |
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| Authors: | Jiang Wenhui Yao Xiangdong Guan Hengrong Hu Zhuangqi |
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| Abstract: | The creep deformation and fracture of DZ40M directionally solidified cobaltbase superalloy have been investigated at 900 under stress in the range of 105125 MPa. The microstructures, fractures and substructures of crept specimens have been examined by SEM and TEM. The results showed that DZ40M alloy exhibits a high creep ductility and its stress dependence of steady state creep rate is of a typical feature of precipitation hardened alloys, its creep behaviour is closely related to microstructural change. During creep, the primary carbides M7C3 and MC dissolved and the secondary M23C6 carbide profusely precipitated, which strengthens the matrix effectively. Creep cracks initiate at the primary carbides and propagate transgranularly. The surface of specimens was oxidized severely and the preferential oxidation of the primary carbides deteriorated creep rupture strength. |
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| Keywords: | directional solidificationcobaltbase superalloycreepfracture |
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