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首页> 外文会议>56th International Astronautical Congress 2005 vol.6 >COMPARISON OF THE HIGH TEMPERATURE FATIGUE PERFORMANCE OF SINGLE CRYSTAL NICKEL-BASED SUPERALLOYS CMSX-4, PWA1484 AND RENE N5 AT 650-725℃
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COMPARISON OF THE HIGH TEMPERATURE FATIGUE PERFORMANCE OF SINGLE CRYSTAL NICKEL-BASED SUPERALLOYS CMSX-4, PWA1484 AND RENE N5 AT 650-725℃

机译：650-725℃单晶镍基高温合金CMSX-4，PWA1484和RENE N5高温疲劳性能的比较

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摘要

The fatigue performance of the single crystal, nickel-base superalloys CMSX-4, PWA1484 and Rene N5 has been investigated to assess problems associated with high stress concentrations found in gas turbine and rocket engine turbo-pump blades. The materials contain Re additions and have superior creep, stress rupture, melt resistance, and thermo-mechanical fatigue capabilities c.f. polycrystalline superalloys. An oxidation study conducted at 650℃ for times ranging from 1 to 256 hours showed that Rene N5 was the most oxidation resistant material. The effect of crystal orientation was assessed by conducting micro Vickers hardness tests on different orientated sections of CMSX-4 and Rene N5. It was mainly found that dendritic and transition regions had higher hardness values than interdendritic regions. Three point bend fatigue testing of notched bars of CMSX-4 was performed in air and vacuum at 650 - 725℃ at different strain ranges using a 1-1-1-1 trapezoidal loading waveform. The fatigue characteristics of CMSX-4 and Rene N5 (bend tests) were then compared to those of PWA1484 (tensile tests). Fractography identified the effect of interdendritic pores and carbides on crack initiation and lifetime.
机译：研究了单晶镍基高温合金CMSX-4，PWA1484和Rene N5的疲劳性能，以评估与燃气轮机和火箭发动机涡轮泵叶片中的高应力集中有关的问题。这些材料含有稀土元素，具有优异的蠕变，应力断裂，抗熔性和热机械疲劳性能。多晶高温合金。在650℃下进行了1到256小时的氧化研究，结果表明，Rene N5是最耐氧化的材料。通过对CMSX-4和Rene N5的不同取向截面进行显微维氏硬度测试，评估了晶体取向的影响。主要发现，树突和过渡区域的硬度值高于树突间区域。使用1-1-1-1梯形载荷波形，在650-725℃的空气和真空中，不同的应变范围下，对CMSX-4的带缺口钢筋进行了三点弯曲疲劳测试。然后将CMSX-4和Rene N5的疲劳特性（弯曲测试）与PWA1484的疲劳特性（拉伸测试）进行了比较。分形术确定了枝晶间孔和碳化物对裂纹萌生和寿命的影响。

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