ZHANG Yuanhu SUN Jian XIANG Yi HU Gengxiang Shanghai Jiaotong University
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Shanghai
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ChinaLI Tiefan Institute of Corrosion and Protection of Metals
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Academia Sinica
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Shenyang
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China Yuanhu
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Department of Materials Science and Engineering
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Shanghai Jiaotong University
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Shanghai
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200030
金属学报(英文版)
Studies on the high temperature creep and fracture behaviours in air or in SO_2 contaminated environment for the Fe-base superalloy GH302 with flat or zigzag grain boundaries(GB) and the Ni-base superalloy Rene 80 were carried out.Although the creep rupture properties of the GH302 with zigzag GB was remarkably superior to that of flat GB in air,the properties of both droped dramatically in 10% SO_2-air environment,the creep rupture properties of the directional solidified Rene 80 were much better than that of the conventionally cast alloy in air,and also kept the same property in SO_2 contaminated environment as in air.Owing to the interaction between creep and sulphidation,the failure mechanism relates to the formation of molten Ni-Ni-3S_2 eutectic along GB,led to the premature failure of the alloy.
关键词:
superalloy
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XU Dong AN Geying LI Qingchun Institute of Materials Science and Engineering
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Shanghai Jiao Tong University
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Shanghai
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200030
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ChinaDept.of Metallic Materials and Technology
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Harbin Institute of Technology
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Harbin
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150006
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ChinaTo whom correspondence should be ad
材料科学技术(英文)
关键词:
steel
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Author X.A. Zhang1)
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H.Q. Xia1)
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Z.T. Wu1)
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Y.F. Han1)
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R. Shi2) and G.X. Hu2) \= 1) Mechanical Properties Laboratory
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Beijing Institute of Aeronautical Materials
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Beijing 100095
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China2) The State Education Commission Open Research Laboratory for High Temperature
金属学报(英文版)
Materials and Testing, Shanghai Jiao Tong University, Shanghai 200030, ChinaManuscript received 18 October 1998 The threestage creep behavior of DD3 single crystal superalloy had been studied. The results show that the creeprupture properties of DD3 single crystal satisfy the requirements for high performance turbine blade application. The influence of crystal orientation on the creeprupture property of DD3 single crystal was tested and discussed. An engineering criterion to evaluate the regimes of secondary and tertiary creep is proposed, and this method gives a reasonable result for practical applications. The fractography and TEM micrography of the tested specimens had been studied, and it is determined that the glidecontrolled creep is the basic creep mechanism of DD3 single crystal at intermediate temperature, but the thermally activated processes become dominant at higher temperature.
关键词:
threestage creep curve
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