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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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第二取向对镍基单晶高温合金dd33热疲劳性能的影响*
Keywords: 金属材料,镍基单晶高温合金,热疲劳,第二取向
Abstract:
？选用不同第二取向的第三代镍基单晶高温合金dd33板式试样进行热疲劳实验,研究了第二取向对单晶高温合金热疲劳性能的影响和不同第二取向样品的热疲劳裂纹扩展动力学。结果表明:第二取向严重影响合金的热疲劳性能。两种第二取向样品,其热疲劳裂纹萌生位置和扩展方向明显不同。在第二取向[100]的样品中,热疲劳裂纹在与定向凝固方向呈45°的孔壁处萌生并沿与定向凝固方向呈45°方向扩展;而在第二取向为[110]的样品中,热疲劳裂纹优先在与定向凝固方向垂直的孔壁处萌生并沿定向凝固方向扩展且裂纹萌生及扩展速度都明显快于第二取向[100]的样品。
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