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金属学报  2015 

先进镍基单晶高温合金组织稳定性及力学行为的研究进展

DOI: 10.11900/0412.1961.2015.00429, PP. 1153-1162

Keywords: 镍基单晶高温合金,组织稳定性,力学行为

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Abstract:

从先进镍基单晶高温合金的微观组织稳定性和力学行为2个方面,简要介绍了γ’相筏化、TCP相析出、高温和超高温低应力蠕变以及低周和热机械疲劳的主要研究进展.合金元素Ru的添加提高了合金的高温低应力蠕变寿命,但也间接促进了拓扑倒置现象的发生.随时效时间的延长和时效温度的升高,m相中的难熔元素含量都会明显增加;随着外加应力的增加,m相的析出量增加,压应力则相反.m相在析出的过程中会形成大量的面缺陷,这些缺陷会促进其它TCP相如P相和R相的形核.在高温低应力蠕变的过程中,镍基单晶高温合金中出现另一种重要的a超位错,通过滑移和攀移相结合的方式在γ’相中缓慢运动.在超高温蠕变条件下,开始出现一个蠕变加速的孕育期,这与γ基体在超高温下不同程度的宽化有关.Ru的添加显著降低了合金的层错能,在低周疲劳的过程中可引起层错贯穿γ/γ’界面、a/6Shockley拖后位错切入γ’相等复杂变形机制.在热机械疲劳的过程中,裂纹萌生的位置、微观结构的变化以及抗氧化性能都会影响镍基单晶高温合金的寿命.

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