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首页> 美国政府科技报告 >Life Prediction Approach for Reliable Improvement in Utilization Potential of P/M Nickel-Based Superalloy Components (Preprint)
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Life Prediction Approach for Reliable Improvement in Utilization Potential of P/M Nickel-Based Superalloy Components (Preprint)

机译：可靠改善p / m镍基高温合金元件利用潜力的寿命预测方法（预印本）

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摘要

The fatigue variability behavior of a powder processed nickel-based superalloy, IN-100 was studied and is discussed with respect to the design life prediction. We found that the stress level, and other loading variables produce distinct effects on the mean behavior and the life-limiting (or the worst-case) behavior. This was because; while the mean was dominated by the conventionally expected fatigue response to these variables the life-limiting behavior was controlled by a different mechanism. Therefore, the total uncertainty in lifetime at given stress level was due to superposition of variability associated with the worst-case and the long-life mechanisms such that, their mean lifetimes separated with decreasing stress level causing an increase in the total variability. Furthermore, the uncertainty in the worst-case mechanism was controlled by the variability in small + long crack growth from the relevant microstructural size scale. In the present IN-100 material, this behavior was found to be related to the number density of constituent particles vs. that of voids and the sequence of selection of the failure mechanisms. Based on this, and our study on other turbine engine materials, we propose an alternate life prediction methodology that has the potential of significantly reducing the uncertainty associated with the traditional approach. The results are discussed with reference to our earlier work on a different nickel-based superalloy with a relatively larger No. 947; grain size that showed a similar fatigue variability behavior but caused both, due to the crystallographic initiation as well as the non-metallic particle initiated failures.

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