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Microstructure dependence of stress relaxation behavior of powder-processed Ni-base superalloys

机译：粉末加工Ni碱基超合金应力松弛行为的微观结构依赖性

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The stress relaxation behavior at 700 °C of two experimental and one commercial powder-possessed Ni-base superalloys possessing different microstructural characteristics were studied following the application of two different strain levels (0.6% and 2%) in order to investigate how phosphorus additions, secondary γ' micro-structure and tertiary γ' microstructure affect the stress relaxation behavior, respectively. Analysis of the characteristic stress relaxation behavior using the natural logarithm of plastic strain rate ln(ε) vs. stress σ curves, revealed that the compositional and microstructural variations impact the stress relaxation behavior differently following deformation to a total strain of 0.6%. No changes in the stress relaxation behavior or γ' microstructure was observed in nominally identical alloys RRHT5P1 and RRHT5P2 that contained 0.013 wt % P and 0.041 wt % P, respectively. Changing the cooling rate from the solution heat treatment temperature for these alloys from 1 °C/s to 2 °C/s, however, did lead to modest changes in both the γ' microstructure and the stress relaxation behavior. Significant variations in the stress relaxation behavior were quantified as a function of the tertiary γ' microstructure in a commercial Ni-base superalloy, RR1000. Reducing the amount of tertiary γ' precipitates by either a prolonged aging process or multi-step aging process contributed to a greater stress drop during stress relaxation, regardless of the variations in the secondary γ' microstructure. Following the application of a total strain of 2%, the stress relaxation process for all the samples was observed to be insensitive to compositional and microstructural variations.
机译：在施加两种不同的应变水平（0.6％和2％）之后，研究了两个实验和一个商业粉末具有具有不同微观结构特性的商业粉末具有不同微观结构特征的商业粉末具有不同微观结构特征的应力松弛行为。为了研究磷的方式如何，二次γ'微结构和第三γ'微观结构分别影响应力松弛行为。利用塑料应变率LN（ε）与应力σ曲线的自然对数的特征应力松弛行为分析，揭示了组成和微观结构变化对应力松弛行为不同，随后变形为0.6％的总菌株。在名义上相同的合金RRHT5P1和RRHT5P2分别观察到应力松弛行为或γ'微观结构的变化分别含有0.013wt％p和0.041wt％p。然而，将这些合金的溶液热处理温度从1°C / s的溶液热处理温度改变为2°C / s的冷却速度导致γ'微观结构和应力松弛行为的适度变化。应力松弛行为的显着变化量被定量为商业Ni基超合金中的第三γ'微观结构的函数，RR1000。通过延长的老化过程或多步老化过程降低沉淀的沉淀物，这导致应力松弛期间的压力下降，而不管次级γ'微观结构的变化。在施加2％的总应变之后，观察到所有样品的应力松弛方法对组成和微观结构的变化不敏感。

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