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首页> 外文期刊>Materials at High Temperatures >The effect of stress, temperature and loading direction on the creep behaviour of Ni-base single crystal superalloy miniature tensile specimens
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The effect of stress, temperature and loading direction on the creep behaviour of Ni-base single crystal superalloy miniature tensile specimens

机译：应力，温度和加载方向对镍基单晶高温合金微型拉伸试样蠕变行为的影响

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摘要

In the present work, we use a miniature test procedure to investigate the tensile creep behaviour of the single crystal superalloy ERBO1. We test precisely oriented [0 0 1], [1 1 0] and [1 1 1] creep specimens and determine the stress and the temperature dependence of characteristic creep rates in limited stress and temperature regimes, where the stress and temperature dependence of characteristic creep rates can be well described by power law and Arrhenius type of relations, with stress exponents n and apparent activation energies Q(app).n-values increase with stress and decrease with temperature. Q(app)-values, on the other hand, increase with increasing temperature and decrease with increasing stress. Creep curve shapes gradually evolve from the high temperature low stress to the low temperature high stress (LTHS) regime. This implies that there is a gradual change in elementary deformation and softening mechanisms, which is qualitatively confirmed using transmission electron microscopy. While at high temperatures different loading directions only have a moderate influence on creep, there is a very strong effect of loading direction at low temperatures. The [1 1 0] tests show the fastest deformation rates and the shortest rupture times. In the LTHS creep regime, we confirm the double minimum (DM) type of creep behaviour, which was previously reported but never explained. Further work is required to rationalise DM-creep. The implications of this type of creep behaviour on scatter and on extrapolation of creep data is discussed in the light of previous results published in the literature.
机译：在当前的工作中，我们使用微型测试程序来研究单晶高温合金ERBO1的拉伸蠕变行为。我们测试了精确定向的[0 0 1]，[1 1 0]和[1 1 1]蠕变样品，并确定了在有限的应力和温度范围内特征蠕变速率的应力和温度依赖性，其中特征应力和温度依赖性蠕变率可以通过幂律和阿伦尼乌斯类型的关系很好地描述，应力指数为n，视在活化能Q（app）。n值随应力增加而随温度降低。另一方面，Q（app）值随温度升高而增加，而随应力增加而降低。蠕变曲线的形状逐渐从高温低应力发展为低温高应力（LTHS）。这意味着在基本变形和软化机理上有逐渐的变化，这在透射电子显微镜下得到了定性的证实。虽然在高温下，不同的加载方向只会对蠕变产生中等程度的影响，但在低温下，加载方向会产生非常强烈的影响。 [1 1 0]测试显示最快的变形速率和最短的破裂时间。在LTHS蠕变状态中，我们确认了蠕变行为的双倍最小（DM）类型，这是以前报道过但从未解释过的。需要进一步的工作以使DM蠕变合理化。根据先前发表在文献中的结果，讨论了这种蠕变行为对散射和蠕变数据外推的影响。

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