ABSTRACT Advanced power plant alloys must endure high temperatures and pressures for durations at which creep data are often not available, necessitating the extrapolation of creep life. A recently developed creep life extrapolation method is the Wilshire equation, with which multiple approaches can be used to increase its goodness of fit to available experimental data and improve the confidence level of calculating long-term creep strength at times well beyond the available experimental data. In this article, the Wilshire and Larson–Miller parameter equations are used to extrapolate the creep life of Incoloy 800 and 304H stainless steel to 100,000 h. The use of (1) different methods to determine creep activation energy, (2) region splitting, and (3) short-duration test data to predict long-term failure were investigated to determine their effects on correlation and extrapolation using the Wilshire equation. The accuracy of the Wilshire and Larson–Miller parameter equations’ calculated times to rupture are compared.

中文翻译：

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使用 Wilshire 方程关联和外推 Incoloy 800 和 304H 不锈钢的蠕变断裂数据

摘要 先进的电厂合金必须在蠕变数据通常不可用的持续时间内承受高温和高压，因此需要外推蠕变寿命。最近开发的蠕变寿命外推方法是 Wilshire 方程，可以使用多种方法来提高其与可用实验数据的拟合优度，并在远远超出可用实验数据的情况下提高计算长期蠕变强度的置信度。在本文中，Wilshire 和 Larson-Miller 参数方程用于将 Incoloy 800 和 304H 不锈钢的蠕变寿命外推至 100,000 小时。使用（1）不同的方法来确定蠕变活化能，（2）区域分裂，(3) 研究了预测长期失效的短期测试数据，以使用 Wilshire 方程确定它们对相关性和外推的影响。比较了 Wilshire 和 Larson-Miller 参数方程计算的破裂时间的准确性。